Tek 465 degree-of-difficulty repair...

B

Bob Engelhardt

Guest
I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.

Thanks, Bob
 
On Thursday, September 2, 2021 at 8:30:51 AM UTC-4, Chris Jones wrote:
Low-bandwidth scopes tended to have better focus. The noise of the
vertical amplifiers can of course be reduced by filtering out the high
frequency noise afterwards. The trace on a 475 gets quite a bit sharper
when it is set into low-bandwidth mode. Perhaps it is an argument for
having two scopes, one with a sharp trace and one with more bandwidth. I
haven\'t got any reasonable justification for the number of analogue
scopes that I have though, apart from \"that looks too good to stay in
the dumpster\".
Click to expand...

Many wideband scopes can be switched to 20MHz mode to mask harmonics and stray RF pickup..
 
terrell....@gmail.com wrote:
---------------------------------------------
Many wideband scopes can be switched to 20MHz mode to mask harmonics and stray RF pickup.
Click to expand...

** Also to reduce visible noise coming from the *input stages* when using the most sensitive vertical settings.

I have a band limiting filter ( 22Hz to 20kHz, -12dB/oct ) I can insert after some audio device that outputs noise above that range, CD players & Class D stuff for example.
But one really needs a multi stage, ceramic filter to do the job well.

Early CD players by Sony had them fitted - made by Murata.

Down 1dB at 22kHz and then -100dB /oct.
Nice.


....... Phil
 
On Mon, 30 Aug 2021 14:45:23 -0700 (PDT), Phil Allison
<pallison49@gmail.com> wrote:

bobenge...@gmail.com wrote:
=========================
I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.

** You are asking a \" Schrodinger\'s Cat \" type question.

The cat can be thought dead or alive - until you open the box.
Click to expand...

That has to be the *dumbest* exposition of the Copenhagen
Interpretation I\'ve ever seen. I\'d stick to soldering bits of wire
together IIWY.

--

Dr. Paul S. Barford, Rochester New York, USA
psb6@harvard.edu
PSB Consulting, NYC, NY and Cambridge MA
 
Bob Engelhardt <BobEngelhardt@comcast.net> wrote:
I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.

Thanks, Bob
Click to expand...

https://w140.com/tekwiki/wiki/465
 
Bob Engelhardt <BobEngelhardt@comcast.net> wrote:
I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.

Thanks, Bob
Click to expand...

https://w140.com/tekwiki/wiki/465
 
In article <sgih9s02vqh@news1.newsguy.com>, BobEngelhardt@comcast.net
says...
I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.

Thanks, Bob
Click to expand...

That\'s what I call \"right to repair\". In the UK it is not permitted to
take kit away from a dump, in case you are not as competent as you think
you are...
 
In article <sgih9s02vqh@news1.newsguy.com>, BobEngelhardt@comcast.net
says...
I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.

Thanks, Bob
Click to expand...

That\'s what I call \"right to repair\". In the UK it is not permitted to
take kit away from a dump, in case you are not as competent as you think
you are...
 
On Monday, August 30, 2021 at 10:19:13 AM UTC-4, Mike Coon wrote:
In article <sgih9...@news1.newsguy.com>, BobEng...@comcast.net
says...

I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.

Thanks, Bob
That\'s what I call \"right to repair\". In the UK it is not permitted to
take kit away from a dump, in case you are not as competent as you think
you are...
_________
Click to expand...

Where do you think I got my stash of spare TV remotes from?

If a bar\'s got a Sony on the wall, in Vivid mode, Im can whip out
my Sony remote, and at least put it in Standard mode.
 
On Monday, August 30, 2021 at 10:19:13 AM UTC-4, Mike Coon wrote:
In article <sgih9...@news1.newsguy.com>, BobEng...@comcast.net
says...

I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.

Thanks, Bob
That\'s what I call \"right to repair\". In the UK it is not permitted to
take kit away from a dump, in case you are not as competent as you think
you are...
_________
Click to expand...

Where do you think I got my stash of spare TV remotes from?

If a bar\'s got a Sony on the wall, in Vivid mode, Im can whip out
my Sony remote, and at least put it in Standard mode.
 
On Mon, 30 Aug 2021 08:01:01 -0400, Bob Engelhardt
<BobEngelhardt@comcast.net> wrote:

I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.

Thanks, Bob
Click to expand...

It\'s a relatively simple part of the scope, if it\'s
an accurate diagnosis.

Helps if you have a working scope to repair this one.

https://groups.io/g/TekScopes/messages

RL
 
On Mon, 30 Aug 2021 08:01:01 -0400, Bob Engelhardt
<BobEngelhardt@comcast.net> wrote:

I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.

Thanks, Bob
Click to expand...

It\'s a relatively simple part of the scope, if it\'s
an accurate diagnosis.

Helps if you have a working scope to repair this one.

https://groups.io/g/TekScopes/messages

RL
 
bobenge...@gmail.com wrote:
=========================
I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.
Click to expand...

** You are asking a \" Schrodinger\'s Cat \" type question.

The cat can be thought dead or alive - until you open the box.


....... Phil
 
bobenge...@gmail.com wrote:
=========================
I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.
Click to expand...

** You are asking a \" Schrodinger\'s Cat \" type question.

The cat can be thought dead or alive - until you open the box.


....... Phil
 
On 30/08/2021 10:01 pm, Bob Engelhardt wrote:
I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\".  Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is.  Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\".  LOL  Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\".  I do have the service manual & another
scope.

Thanks, Bob
Click to expand...

**Who knows? Download a service manual and get to work. The 465/b is an
excellent \'scope and built to last a VERY long time.
 
On Monday, August 30, 2021 at 3:34:42 PM UTC-4, legg wrote:
On Mon, 30 Aug 2021 08:01:01 -0400, Bob Engelhardt
BobEng...@comcast.net> wrote:

I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.

Thanks, Bob
It\'s a relatively simple part of the scope, if it\'s
an accurate diagnosis.

Helps if you have a working scope to repair this one.

https://groups.io/g/TekScopes/messages

RL
Click to expand...

I second the motion to join & post on the TekScopes message board. A lot of *very* knowledgeable ppl hang out there. IMHO, I\'d spend 15 mins with it plugged in to understand more clearly the characteristics of the malfunction. If you put that info in your post, you might get a bit more of an answer along the lines you are looking for.
A 465 is a very well-known and popular scope. It was standard gear for DEC and IBM field circus back in the day, and a typical scope in a lot of college EE labs.
good luck
J
 
On Monday, August 30, 2021 at 3:34:42 PM UTC-4, legg wrote:
On Mon, 30 Aug 2021 08:01:01 -0400, Bob Engelhardt
BobEng...@comcast.net> wrote:

I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.

Thanks, Bob
It\'s a relatively simple part of the scope, if it\'s
an accurate diagnosis.

Helps if you have a working scope to repair this one.

https://groups.io/g/TekScopes/messages

RL
Click to expand...

I second the motion to join & post on the TekScopes message board. A lot of *very* knowledgeable ppl hang out there. IMHO, I\'d spend 15 mins with it plugged in to understand more clearly the characteristics of the malfunction. If you put that info in your post, you might get a bit more of an answer along the lines you are looking for.
A 465 is a very well-known and popular scope. It was standard gear for DEC and IBM field circus back in the day, and a typical scope in a lot of college EE labs.
good luck
J
 
On Monday, August 30, 2021 at 3:34:42 PM UTC-4, legg wrote:
On Mon, 30 Aug 2021 08:01:01 -0400, Bob Engelhardt
BobEng...@comcast.net> wrote:

I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.

Thanks, Bob
It\'s a relatively simple part of the scope, if it\'s
an accurate diagnosis.

Helps if you have a working scope to repair this one.

https://groups.io/g/TekScopes/messages

RL
Click to expand...

I second the motion to join & post on the TekScopes message board. A lot of *very* knowledgeable ppl hang out there. IMHO, I\'d spend 15 mins with it plugged in to understand more clearly the characteristics of the malfunction. If you put that info in your post, you might get a bit more of an answer along the lines you are looking for.
A 465 is a very well-known and popular scope. It was standard gear for DEC and IBM field circus back in the day, and a typical scope in a lot of college EE labs.
good luck
J
 
Chris K-Man wrote:
On Monday, August 30, 2021 at 10:19:13 AM UTC-4, Mike Coon wrote:
In article <sgih9...@news1.newsguy.com>, BobEng...@comcast.net
says...

I found a 465 at the dump with a sticker on it saying \"Horizontal
deflection bad\". Before I even power it up I thought that I\'d get
opinions on how bad the problem likely is. Best case: \"That happens all
the time & it\'s a bad Qxxx transistor in the framazazzle\". LOL Worst
case: \"It could be any number of things and you\'ll likely spend hours
and hours to fix a $100 scope\". I do have the service manual & another
scope.

Thanks, Bob
That\'s what I call \"right to repair\". In the UK it is not permitted to
take kit away from a dump, in case you are not as competent as you think
you are...
_________

Where do you think I got my stash of spare TV remotes from?

If a bar\'s got a Sony on the wall, in Vivid mode, Im can whip out
my Sony remote, and at least put it in Standard mode.
Click to expand...

Thats the moment I secretly use my TV-B-Gone

Kind regards, Eike
 
three_jeeps wrote:
------------------------------
I second the motion to join & post on the TekScopes message board.
A lot of *very* knowledgeable ppl hang out there.
Click to expand...

** Antique scope freaks .....

A 465 is a very well-known and popular scope.
It was standard gear for DEC and IBM field circus back in the day,
Click to expand...

** Had the use of the earlier & similar a Tek 463 for a couple of years.
On loan, from a Sydney based IBM engineer - son of the man I worked for.
Not very fond of it cos it lacked the one thing a good analogue scope needs.
A sharply focused trace.

The PDA ( post deflection acceleration ) tube was poor and you could see the blurring effect
of the acceleration grid behind the face of the CRT all the time.
It also had an external, lamp lit graticule - very clunky compared internal graticule tubes
that most scope used from the 1980s onwards.



....... Phil
 
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