Tektronix 2% Ag Solder

Guest
Why ? I know it is for their proprietary (probably) ceramic connector strips. They indicate you can get by with regular solder once or twice but too much and it breaks the bond.

So does that mean that this solder can bond right to ceramic ? I think that is a neat trick if that is how it is. Is that the reason for the silver ?

If so, or even off base and needing correction...just what properties are so special ? Does the silver make it less eutectic ? Or possibly MORE eutectic ? Is it the thermal mass, conductivity or expansion coefficient ?

I figured it would be a better idea to ask here than in SER because you guys have a more rounded education and are more familiar with process.

Another thing is I would like to obtain such connectors for my project. Extreme high end audio with massive currents, I would rather hardwire it than use PC boards, do they make 40 oz. copper boards ? Right now I figure my best bet is to use the normal ones that have been around forever but to take and bed the top of each one over so the hole becomes a slot. I DO NOT want the lead wrapped all around there making it a PITA to change. It also makes radiation, capacitance and inductance less predictable. That is obviously one of the reasons Tektronix used it.

We all know that silver has the lowest room temperature resistance, unless they came out with a new superconductor they haven't told me about. But can 2% of it make much difference electrically ?

And then there is the question, is it really now just Pb62/Sn36/Ag2 for example ? Or is there other things in it ? They never said there weren't. One thing I learned is never to assume anything they don't say. I mean to the point if you see a box in the store that says TV, make sure it says COLOR TV. Like "This phone doesn't have that", "Why didn't you tell me ?", "You didn't ask". So even with that mini-ISB don't assume it can give you a rim job...

So maybe there is more in that solder ? Too bad Jim Yanik isn't around, he would have the answer in 38 millisecods...
 
On Tue, 25 Feb 2020 13:55:44 -0800 (PST), jrwalliker@gmail.com wrote:

On Tuesday, 25 February 2020 21:51:52 UTC, jurb...@gmail.com wrote:
Why ? I know it is for their proprietary (probably) ceramic connector strips. They indicate you can get by with regular solder once or twice but too much and it breaks the bond.

So does that mean that this solder can bond right to ceramic ? I think that is a neat trick if that is how it is. Is that the reason for the silver ?

If so, or even off base and needing correction...just what properties are so special ? Does the silver make it less eutectic ? Or possibly MORE eutectic ? Is it the thermal mass, conductivity or expansion coefficient ?

I figured it would be a better idea to ask here than in SER because you guys have a more rounded education and are more familiar with process.

Another thing is I would like to obtain such connectors for my project. Extreme high end audio with massive currents, I would rather hardwire it than use PC boards, do they make 40 oz. copper boards ? Right now I figure my best bet is to use the normal ones that have been around forever but to take and bed the top of each one over so the hole becomes a slot. I DO NOT want the lead wrapped all around there making it a PITA to change. It also makes radiation, capacitance and inductance less predictable. That is obviously one of the reasons Tektronix used it.

We all know that silver has the lowest room temperature resistance, unless they came out with a new superconductor they haven't told me about. But can 2% of it make much difference electrically ?

And then there is the question, is it really now just Pb62/Sn36/Ag2 for example ? Or is there other things in it ? They never said there weren't. One thing I learned is never to assume anything they don't say. I mean to the point if you see a box in the store that says TV, make sure it says COLOR TV. Like "This phone doesn't have that", "Why didn't you tell me ?", "You didn't ask". So even with that mini-ISB don't assume it can give you a rim job...

So maybe there is more in that solder ? Too bad Jim Yanik isn't around, he would have the answer in 38 millisecods...

The connector strips are probably silver plated in selected areas. The
silver in the solder stops the plating from being dissolved by the
molten solder.

John

Right. But they haven't used these strips in many decades.

Some of my old scopes have a small spool of that solder inside.


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
 
On Tuesday, 25 February 2020 21:51:52 UTC, jurb...@gmail.com wrote:
Why ? I know it is for their proprietary (probably) ceramic connector strips. They indicate you can get by with regular solder once or twice but too much and it breaks the bond.

So does that mean that this solder can bond right to ceramic ? I think that is a neat trick if that is how it is. Is that the reason for the silver ?

If so, or even off base and needing correction...just what properties are so special ? Does the silver make it less eutectic ? Or possibly MORE eutectic ? Is it the thermal mass, conductivity or expansion coefficient ?

I figured it would be a better idea to ask here than in SER because you guys have a more rounded education and are more familiar with process.

Another thing is I would like to obtain such connectors for my project. Extreme high end audio with massive currents, I would rather hardwire it than use PC boards, do they make 40 oz. copper boards ? Right now I figure my best bet is to use the normal ones that have been around forever but to take and bed the top of each one over so the hole becomes a slot. I DO NOT want the lead wrapped all around there making it a PITA to change. It also makes radiation, capacitance and inductance less predictable. That is obviously one of the reasons Tektronix used it.

We all know that silver has the lowest room temperature resistance, unless they came out with a new superconductor they haven't told me about. But can 2% of it make much difference electrically ?

And then there is the question, is it really now just Pb62/Sn36/Ag2 for example ? Or is there other things in it ? They never said there weren't. One thing I learned is never to assume anything they don't say. I mean to the point if you see a box in the store that says TV, make sure it says COLOR TV. Like "This phone doesn't have that", "Why didn't you tell me ?", "You didn't ask". So even with that mini-ISB don't assume it can give you a rim job...

So maybe there is more in that solder ? Too bad Jim Yanik isn't around, he would have the answer in 38 millisecods...

The connector strips are probably silver plated in selected areas. The
silver in the solder stops the plating from being dissolved by the
molten solder.

John
 
On 2020/02/25 2:26 p.m., John Larkin wrote:
On Tue, 25 Feb 2020 13:55:44 -0800 (PST), jrwalliker@gmail.com wrote:

On Tuesday, 25 February 2020 21:51:52 UTC, jurb...@gmail.com wrote:
Why ? I know it is for their proprietary (probably) ceramic connector strips. They indicate you can get by with regular solder once or twice but too much and it breaks the bond.

So does that mean that this solder can bond right to ceramic ? I think that is a neat trick if that is how it is. Is that the reason for the silver ?

If so, or even off base and needing correction...just what properties are so special ? Does the silver make it less eutectic ? Or possibly MORE eutectic ? Is it the thermal mass, conductivity or expansion coefficient ?

I figured it would be a better idea to ask here than in SER because you guys have a more rounded education and are more familiar with process.

Another thing is I would like to obtain such connectors for my project. Extreme high end audio with massive currents, I would rather hardwire it than use PC boards, do they make 40 oz. copper boards ? Right now I figure my best bet is to use the normal ones that have been around forever but to take and bed the top of each one over so the hole becomes a slot. I DO NOT want the lead wrapped all around there making it a PITA to change. It also makes radiation, capacitance and inductance less predictable. That is obviously one of the reasons Tektronix used it.

We all know that silver has the lowest room temperature resistance, unless they came out with a new superconductor they haven't told me about. But can 2% of it make much difference electrically ?

And then there is the question, is it really now just Pb62/Sn36/Ag2 for example ? Or is there other things in it ? They never said there weren't. One thing I learned is never to assume anything they don't say. I mean to the point if you see a box in the store that says TV, make sure it says COLOR TV. Like "This phone doesn't have that", "Why didn't you tell me ?", "You didn't ask". So even with that mini-ISB don't assume it can give you a rim job...

So maybe there is more in that solder ? Too bad Jim Yanik isn't around, he would have the answer in 38 millisecods...

The connector strips are probably silver plated in selected areas. The
silver in the solder stops the plating from being dissolved by the
molten solder.

John

Right. But they haven't used these strips in many decades.

Some of my old scopes have a small spool of that solder inside.

It might not be the silver content so much as the flux in the solder
that came with the 2%AU stuff.

Modern water soluble, (etc.) solder flux may work better (or worse)...

John :-#)#
 
tirsdag den 25. februar 2020 kl. 23.26.26 UTC+1 skrev John Larkin:
On Tue, 25 Feb 2020 13:55:44 -0800 (PST), jrwalliker@gmail.com wrote:

On Tuesday, 25 February 2020 21:51:52 UTC, jurb...@gmail.com wrote:
Why ? I know it is for their proprietary (probably) ceramic connector strips. They indicate you can get by with regular solder once or twice but too much and it breaks the bond.

So does that mean that this solder can bond right to ceramic ? I think that is a neat trick if that is how it is. Is that the reason for the silver ?

If so, or even off base and needing correction...just what properties are so special ? Does the silver make it less eutectic ? Or possibly MORE eutectic ? Is it the thermal mass, conductivity or expansion coefficient ?

I figured it would be a better idea to ask here than in SER because you guys have a more rounded education and are more familiar with process.

Another thing is I would like to obtain such connectors for my project.. Extreme high end audio with massive currents, I would rather hardwire it than use PC boards, do they make 40 oz. copper boards ? Right now I figure my best bet is to use the normal ones that have been around forever but to take and bed the top of each one over so the hole becomes a slot. I DO NOT want the lead wrapped all around there making it a PITA to change. It also makes radiation, capacitance and inductance less predictable. That is obviously one of the reasons Tektronix used it.

We all know that silver has the lowest room temperature resistance, unless they came out with a new superconductor they haven't told me about. But can 2% of it make much difference electrically ?

And then there is the question, is it really now just Pb62/Sn36/Ag2 for example ? Or is there other things in it ? They never said there weren't. One thing I learned is never to assume anything they don't say. I mean to the point if you see a box in the store that says TV, make sure it says COLOR TV. Like "This phone doesn't have that", "Why didn't you tell me ?", "You didn't ask". So even with that mini-ISB don't assume it can give you a rim job...

So maybe there is more in that solder ? Too bad Jim Yanik isn't around, he would have the answer in 38 millisecods...

The connector strips are probably silver plated in selected areas. The
silver in the solder stops the plating from being dissolved by the
molten solder.

John

Right. But they haven't used these strips in many decades.

Some of my old scopes have a small spool of that solder inside.

the roll I've been using since forever is SnPbAg 62/36/2
I think back when I got it was recommended for ceramic capacitors
because they use(d?) silver in their terminations
 
John Larkin wrote:
On Tue, 25 Feb 2020 13:55:44 -0800 (PST), jrwalliker@gmail.com wrote:

On Tuesday, 25 February 2020 21:51:52 UTC, jurb...@gmail.com wrote:
Why ? I know it is for their proprietary (probably) ceramic connector strips. They indicate you can get by with regular solder once or twice but too much and it breaks the bond.

So does that mean that this solder can bond right to ceramic ? I think that is a neat trick if that is how it is. Is that the reason for the silver ?

If so, or even off base and needing correction...just what properties are so special ? Does the silver make it less eutectic ? Or possibly MORE eutectic ? Is it the thermal mass, conductivity or expansion coefficient ?

I figured it would be a better idea to ask here than in SER because you guys have a more rounded education and are more familiar with process.

Another thing is I would like to obtain such connectors for my project. Extreme high end audio with massive currents, I would rather hardwire it than use PC boards, do they make 40 oz. copper boards ? Right now I figure my best bet is to use the normal ones that have been around forever but to take and bed the top of each one over so the hole becomes a slot. I DO NOT want the lead wrapped all around there making it a PITA to change. It also makes radiation, capacitance and inductance less predictable. That is obviously one of the reasons Tektronix used it.

We all know that silver has the lowest room temperature resistance, unless they came out with a new superconductor they haven't told me about. But can 2% of it make much difference electrically ?

And then there is the question, is it really now just Pb62/Sn36/Ag2 for example ? Or is there other things in it ? They never said there weren't. One thing I learned is never to assume anything they don't say. I mean to the point if you see a box in the store that says TV, make sure it says COLOR TV. Like "This phone doesn't have that", "Why didn't you tell me ?", "You didn't ask". So even with that mini-ISB don't assume it can give you a rim job...

So maybe there is more in that solder ? Too bad Jim Yanik isn't around, he would have the answer in 38 millisecods...

The connector strips are probably silver plated in selected areas. The
silver in the solder stops the plating from being dissolved by the
molten solder.

John

Right. But they haven't used these strips in many decades.

Some of my old scopes have a small spool of that solder inside.
....and that solder is tin/silver eutectic NOT suckie SAC which did not
exist then.
 
On Tuesday, 25 February 2020 21:51:52 UTC, jurb...@gmail.com wrote:

Why ? I know it is for their proprietary (probably) ceramic connector strips. They indicate you can get by with regular solder once or twice but too much and it breaks the bond.

So does that mean that this solder can bond right to ceramic ? I think that is a neat trick if that is how it is. Is that the reason for the silver ?

sounds unlikely.

If so, or even off base and needing correction...just what properties are so special ? Does the silver make it less eutectic ? Or possibly MORE eutectic ? Is it the thermal mass, conductivity or expansion coefficient ?

I figured it would be a better idea to ask here than in SER because you guys have a more rounded education and are more familiar with process.

Another thing is I would like to obtain such connectors for my project. Extreme high end audio with massive currents, I would rather hardwire it than use PC boards, do they make 40 oz. copper boards ?

You can always lay copper wire on PCB tracks. Soldering along the tracks is a less conductive option. Or islands rather than tracks.


> Right now I figure my best bet is to use the normal ones that have been around forever but to take and bed the top of each one over so the hole becomes a slot.

Que?


I DO NOT want the lead wrapped all around there making it a PITA to change. It also makes radiation, capacitance and inductance less predictable. That is obviously one of the reasons Tektronix used it.

We all know that silver has the lowest room temperature resistance, unless they came out with a new superconductor they haven't told me about. But can 2% of it make much difference electrically ?

no


And then there is the question, is it really now just Pb62/Sn36/Ag2 for example ? Or is there other things in it ? They never said there weren't. One thing I learned is never to assume anything they don't say. I mean to the point if you see a box in the store that says TV, make sure it says COLOR TV. Like "This phone doesn't have that", "Why didn't you tell me ?", "You didn't ask". So even with that mini-ISB don't assume it can give you a rim job...

So maybe there is more in that solder ? Too bad Jim Yanik isn't around, he would have the answer in 38 millisecods...

I'm not familiar with it, but it's not going to be magic. Another way to get extreme low R would be to glue/solder thick copper wire down to tracks & solder components onto the thick wires. If it's really worth it.


NT
 
On Wed, 26 Feb 2020 02:19:07 -0800, tabbypurr wrote:

On Tuesday, 25 February 2020 21:51:52 UTC, jurb...@gmail.com wrote:

Why ? I know it is for their proprietary (probably) ceramic connector
strips. They indicate you can get by with regular solder once or twice
but too much and it breaks the bond.

So does that mean that this solder can bond right to ceramic ? I think
that is a neat trick if that is how it is. Is that the reason for the
silver ?

The 2% silver tin-lead solder was for use on ceramic terminal strips
which had silver plating in the notches of an otherwise plain ceramic bar
with mounting holes and no metal except for the silver plating. The
silver in the solder was to keep it from dissolving the silver plating
from the ceramic substrate - once that happens the connection falls off
the terminal strip. No solder, silver bearing or not, will bond to
unplated ceramic. I don't think I have seen these on anything made after
the '60s, pretty much of historical interest only.
 
On 2020-02-26 18:30, glen walpert wrote:
On Wed, 26 Feb 2020 02:19:07 -0800, tabbypurr wrote:

On Tuesday, 25 February 2020 21:51:52 UTC, jurb...@gmail.com wrote:

Why ? I know it is for their proprietary (probably) ceramic connector
strips. They indicate you can get by with regular solder once or twice
but too much and it breaks the bond.

So does that mean that this solder can bond right to ceramic ? I think
that is a neat trick if that is how it is. Is that the reason for the
silver ?

The 2% silver tin-lead solder was for use on ceramic terminal strips
which had silver plating in the notches of an otherwise plain ceramic bar
with mounting holes and no metal except for the silver plating. The
silver in the solder was to keep it from dissolving the silver plating
from the ceramic substrate - once that happens the connection falls off
the terminal strip. No solder, silver bearing or not, will bond to
unplated ceramic. I don't think I have seen these on anything made after
the '60s, pretty much of historical interest only.

Indium solder will bond to glass and ceramic. An ultrasonic soldering
iron helps a lot.

2% Ag in SnPb solder helps a lot when using ceramic packages with
evaporated gold contacts. A few years back I was using some InGaAs
photodiodes on packages like that--normal Sn63 solder ate the gold right
off the ceramic, leaving nothing. (A bit of a heart-scald when your
diodes cost $50 each and take weeks to get.)

InSn eutectic was fine, but so was 2% Ag in SnPb. The 2% stuff is much
cheaper.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
On Wednesday, February 26, 2020 at 6:52:56 PM UTC-5, Phil Hobbs wrote:
On 2020-02-26 18:30, glen walpert wrote:
On Wed, 26 Feb 2020 02:19:07 -0800, tabbypurr wrote:

On Tuesday, 25 February 2020 21:51:52 UTC, jurb...@gmail.com wrote:

Why ? I know it is for their proprietary (probably) ceramic connector
strips. They indicate you can get by with regular solder once or twice
but too much and it breaks the bond.

So does that mean that this solder can bond right to ceramic ? I think
that is a neat trick if that is how it is. Is that the reason for the
silver ?

The 2% silver tin-lead solder was for use on ceramic terminal strips
which had silver plating in the notches of an otherwise plain ceramic bar
with mounting holes and no metal except for the silver plating. The
silver in the solder was to keep it from dissolving the silver plating
from the ceramic substrate - once that happens the connection falls off
the terminal strip. No solder, silver bearing or not, will bond to
unplated ceramic. I don't think I have seen these on anything made after
the '60s, pretty much of historical interest only.


Indium solder will bond to glass and ceramic. An ultrasonic soldering
iron helps a lot.

2% Ag in SnPb solder helps a lot when using ceramic packages with
evaporated gold contacts. A few years back I was using some InGaAs
photodiodes on packages like that--normal Sn63 solder ate the gold right
off the ceramic, leaving nothing. (A bit of a heart-scald when your
diodes cost $50 each and take weeks to get.)
I'll never forget the first time I tried to solder some thin gold
wire... and watched the whole thing disappear into the solder blob
on the end of the iron.

GH
InSn eutectic was fine, but so was 2% Ag in SnPb. The 2% stuff is much
cheaper.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
On Tue, 25 Feb 2020 13:51:46 -0800 (PST), jurb6006@gmail.com wrote:

If you know that 62/36/2 (tin/lead/silver) is the proper solder to use
on old Tektonix scopes, why are you looking for an alternative?
Surely, it's not the price or availability.
<https://www.radioshack.com/products/silver-bearing-solder>
<https://www.amazon.com/RadioShack-SnPbAg-Silver-Bearing-Rosin-Core-Diameter/dp/B07PV1P1QX>
<https://www.newark.com/c/tools-production-supplies/soldering-stations-accessories/solder/solder-wire?solder-alloy=62-36-2-sn-pb-ag>
<https://www.ebay.com/sch/i.html?_nkw=62%2F36%2F2+Silver-Bearing+Rosin-Core+Solder>
However, if you decide to try some other non-silver solder mix, I
found a way to repair the inevitable damage after I made the same
mistake. I suggest copper foil adhesive tape in place of the missing
silver plating, and bury it under a blob of ordinary 63/37 solder to
hold it in place.
<https://www.ebay.com/sch/i.html?_nkw=adhesive+copper+foil+tape>


--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
 
If you know that 62/36/2 (tin/lead/silver) is the proper solder to >use on old Tektonix scopes, why are you looking for an alternative?
Surely, it's not the price or availability.

The question is mainly academic. It is pertinent to something going on as I consider different construction methods but it certainly is not price, these things are not going to be cheap. Let's put it this way, I FINALLY found suitable parts for it and they are $360 each, and it takes two.

So being the expense is going to be very significant I would like to have a better construction method. I want really low stray capacitance, resistance and inductance and I want EMI extremely limited. This is a high end audio amp and it is not going to have any global feedback. The common collector drivers for the outputs have a tracking collector supply to keep them in the most linear range, and each stage also sets its own gain. This approach is rarely used because of - difficulties. The best part is still the output circuit. What I got has never been done as far as I know and I am familiar with tons of topologies. it is so unique I will not patent it. To kinda protect it I figure on the top and bottom I will cement acrylic sheets, look but don't touch.

This way it will probably take three years before the Chinese get their hands on one, if I apply for a patent they get it right now. Now it looks like Trump is getting our intellectual property rights some respect from the Chinese, in fact that is in there but coming more in phase two I think. I think his attitude is right about them, it is like "You can make a little less money or none" which means 20% of their sales. Wouldn't kill them but would you like to live on 20% less ? He does have some mistakes under his belt but this ain't one of them.

Anyway, they ain't the only ones, there are even domestic copiers. All they have to do is make a few changes and sidestep the patent. I am thinking of spray paint maybe for the components. Long warranty, captive service like it is broke ? Well you can wait for a shipping container and send it and get another one, or we can put a hold on your card and just send it, as long as you send the old one back your card is not charged. I had something like that, it worked out because they gave me a box for it. I had thrown the original one away, believe me I do not do that anymore. I got boxes for a whole bunch of stuff in a room in the basement now. Ugh, and we just bought a bunch off new shit and then got given some - some from my Aunt who moved far away so now there are three large TVs, five microwaves, and there are three of us...

Anyway, that seems like the best plan. Take it apart and no warranty. But you can see it and "admire" its construction techniques.

There has to be something better out there than those strips they used in the 1940s. And I refuse to scrap Tek scopes for them, that is like blasphemy of the first degree. Plus that limits availability, I might have to keep making these things if they catch on. And I know how to make them catch on. Not only is it different and will behave different I intend to use every dirty trick in the book to beat the others cold. Like manipulating the frequency response. Sure I can get it to within +/- 0.001dB, but spec it to +/- 1 and you got 2dB to play with. Sweeten the high and low end just a bit, take out some harsh. Maybe add a little throat.

I don't even intend to try to hide that. them people are not really spec anal. If hey were they would not listen to single ended triodes. However being mostly even order distortion they might actually like it, the human voice is full of it. That's why AM transmitters make sure of the mic polarity, they want to up modulate, not down modulate. (you knew that I bet but I threw it i anyway) With most any other type of modulation it means nothing.

Anyway, enough on that tangent. The other problem with this amp is the extreme currents involved. It might only be 35 volts but at maybe 30 amps solid.. That is arc welding language.
 
On Thursday, February 27, 2020 at 2:41:33 AM UTC-5, jurb...@gmail.com wrote:
If you know that 62/36/2 (tin/lead/silver) is the proper solder to >use on old Tektonix scopes, why are you looking for an alternative?
Surely, it's not the price or availability.

The question is mainly academic. It is pertinent to something going on as I consider different construction methods but it certainly is not price, these things are not going to be cheap. Let's put it this way, I FINALLY found suitable parts for it and they are $360 each, and it takes two.

So being the expense is going to be very significant I would like to have a better construction method. I want really low stray capacitance, resistance and inductance and I want EMI extremely limited. This is a high end audio amp and it is not going to have any global feedback. The common collector drivers for the outputs have a tracking collector supply to keep them in the most linear range, and each stage also sets its own gain. This approach is rarely used because of - difficulties. The best part is still the output circuit. What I got has never been done as far as I know and I am familiar with tons of topologies. it is so unique I will not patent it. To kinda protect it I figure on the top and bottom I will cement acrylic sheets, look but don't touch.

This way it will probably take three years before the Chinese get their hands on one, if I apply for a patent they get it right now. Now it looks like Trump is getting our intellectual property rights some respect from the Chinese, in fact that is in there but coming more in phase two I think. I think his attitude is right about them, it is like "You can make a little less money or none" which means 20% of their sales. Wouldn't kill them but would you like to live on 20% less ? He does have some mistakes under his belt but this ain't one of them.

Anyway, they ain't the only ones, there are even domestic copiers. All they have to do is make a few changes and sidestep the patent. I am thinking of spray paint maybe for the components. Long warranty, captive service like it is broke ? Well you can wait for a shipping container and send it and get another one, or we can put a hold on your card and just send it, as long as you send the old one back your card is not charged. I had something like that, it worked out because they gave me a box for it. I had thrown the original one away, believe me I do not do that anymore. I got boxes for a whole bunch of stuff in a room in the basement now. Ugh, and we just bought a bunch off new shit and then got given some - some from my Aunt who moved far away so now there are three large TVs, five microwaves, and there are three of us...

Anyway, that seems like the best plan. Take it apart and no warranty. But you can see it and "admire" its construction techniques.

There has to be something better out there than those strips they used in the 1940s. And I refuse to scrap Tek scopes for them, that is like blasphemy of the first degree. Plus that limits availability, I might have to keep making these things if they catch on. And I know how to make them catch on.. Not only is it different and will behave different I intend to use every dirty trick in the book to beat the others cold. Like manipulating the frequency response. Sure I can get it to within +/- 0.001dB, but spec it to +/- 1 and you got 2dB to play with. Sweeten the high and low end just a bit, take out some harsh. Maybe add a little throat.

I don't even intend to try to hide that. them people are not really spec anal. If hey were they would not listen to single ended triodes. However being mostly even order distortion they might actually like it, the human voice is full of it. That's why AM transmitters make sure of the mic polarity, they want to up modulate, not down modulate. (you knew that I bet but I threw it i anyway) With most any other type of modulation it means nothing.

Anyway, enough on that tangent. The other problem with this amp is the extreme currents involved. It might only be 35 volts but at maybe 30 amps solid. That is arc welding language.

Turret boards or standoffs are a lot cheaper.
 
On 27/02/2020 10:52, Phil Hobbs wrote:
On 2020-02-26 18:30, glen walpert wrote:
On Wed, 26 Feb 2020 02:19:07 -0800, tabbypurr wrote:

On Tuesday, 25 February 2020 21:51:52 UTC, jurb...@gmail.com  wrote:

Why ? I know it is for their proprietary (probably) ceramic connector
strips. They indicate you can get by with regular solder once or twice
but too much and it breaks the bond.

So does that mean that this solder can bond right to ceramic ? I think
that is a neat trick if that is how it is. Is that the reason for the
silver ?

The 2% silver tin-lead solder was for use on ceramic terminal strips
which had silver plating in the notches of an otherwise plain ceramic bar
with mounting holes and no metal except for the silver plating.  The
silver in the solder was to keep it from dissolving the silver plating
from the ceramic substrate - once that happens the connection falls off
the terminal strip.  No solder, silver bearing or not, will bond to
unplated ceramic.  I don't think I have seen these on anything made after
the '60s, pretty much of historical interest only.


Indium solder will bond to glass and ceramic.  An ultrasonic soldering
iron helps a lot.

Yes, as I'm sure you (but perhaps not others) know, it is used for
attaching wires to ITO (Indium Tin Oxide) coated glass.

Also, I recently found out that ceramics can be brazed.
https://www.twi-global.com/technical-knowledge/faqs/faq-what-is-active-metal-brazing
 
On 2020-02-27 18:25, Chris Jones wrote:
On 27/02/2020 10:52, Phil Hobbs wrote:
On 2020-02-26 18:30, glen walpert wrote:
On Wed, 26 Feb 2020 02:19:07 -0800, tabbypurr wrote:

On Tuesday, 25 February 2020 21:51:52 UTC, jurb...@gmail.com  wrote:

Why ? I know it is for their proprietary (probably) ceramic connector
strips. They indicate you can get by with regular solder once or twice
but too much and it breaks the bond.

So does that mean that this solder can bond right to ceramic ? I think
that is a neat trick if that is how it is. Is that the reason for the
silver ?

The 2% silver tin-lead solder was for use on ceramic terminal strips
which had silver plating in the notches of an otherwise plain ceramic
bar
with mounting holes and no metal except for the silver plating.  The
silver in the solder was to keep it from dissolving the silver plating
from the ceramic substrate - once that happens the connection falls off
the terminal strip.  No solder, silver bearing or not, will bond to
unplated ceramic.  I don't think I have seen these on anything made
after
the '60s, pretty much of historical interest only.


Indium solder will bond to glass and ceramic.  An ultrasonic soldering
iron helps a lot.

Yes, as I'm sure you (but perhaps not others) know, it is used for
attaching wires to ITO (Indium Tin Oxide) coated glass.

Also, I recently found out that ceramics can be brazed.
https://www.twi-global.com/technical-knowledge/faqs/faq-what-is-active-metal-brazing

When my ship comes in, I'll buy an ultrasonic iron. They can do magic
things even with 63SnPb, including soldering to aluminum without
horrible corrosive ZnCl2/KCL flux.

Long ago at IBM, I used to borrow one from a colleague now and then.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 

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