A
amdx
Guest
On 7/21/2014 9:57 PM, Trevor Wilson wrote:
The US is not irrelevant, but Obama is working towards it.
Mikek
The US is not irrelevant, but Obama is working towards it.
Mikek
F
Fred McKenzie
Guest
In article <lqklvo$is$1@dont-email.me>,
"Tom Miller" <tmiller11147@verizon.net> wrote:
The hotter one is a Kenwood KPS-21. However the insides are almost
identical to an Astron RS-20A, except the Kenwood does not have a
crowbar circuit installed. Date Codes on components are from 1980, and
I purchased it about 1981. Its label says input voltage should be 120
VAC
The other is an Astron RS-20A with date codes from the mid-1990s. Its
label says input voltage should be 115 VAC. It was recently purchased
from an estate with a goal of replacing the hot KPS-21!
Line voltage here runs about 119 VAC, although equipment should be
designed to operate over a +/- ten percent range (108 to 132 VAC) in the
U.S.
Fred
"Tom Miller" <tmiller11147@verizon.net> wrote:
The hotter one is a Kenwood KPS-21. However the insides are almost
identical to an Astron RS-20A, except the Kenwood does not have a
crowbar circuit installed. Date Codes on components are from 1980, and
I purchased it about 1981. Its label says input voltage should be 120
VAC
The other is an Astron RS-20A with date codes from the mid-1990s. Its
label says input voltage should be 115 VAC. It was recently purchased
from an estate with a goal of replacing the hot KPS-21!
Line voltage here runs about 119 VAC, although equipment should be
designed to operate over a +/- ten percent range (108 to 132 VAC) in the
U.S.
Fred
T
Trevor Wilson
Guest
On 23/07/2014 1:51 AM, amdx wrote:
**Nope. The rot began with Reagan. Dubya wiped the US out. Obama, at
least, has some credibility. Dubya was a drug-addled moron, who cost the
US several trillion Dollars in needless spending.
--
Trevor Wilson www.rageaudio.com.au
**Nope. The rot began with Reagan. Dubya wiped the US out. Obama, at
least, has some credibility. Dubya was a drug-addled moron, who cost the
US several trillion Dollars in needless spending.
--
Trevor Wilson www.rageaudio.com.au
T
Trevor Wilson
Guest
On 23/07/2014 2:37 AM, Tim R wrote:
**I agree that there is no specific advantage in Celsius, except, of
course, that it dove-tails neatly with Kelvin measurements. SI units, on
the whole, however, are universally accepted and logical for humans to
work with. No one of any consequence bothers with Imperial measurements
any longer.
--
Trevor Wilson www.rageaudio.com.au
**I agree that there is no specific advantage in Celsius, except, of
course, that it dove-tails neatly with Kelvin measurements. SI units, on
the whole, however, are universally accepted and logical for humans to
work with. No one of any consequence bothers with Imperial measurements
any longer.
--
Trevor Wilson www.rageaudio.com.au
M
Michael A. Terrell
Guest
Gareth Magennis wrote:
Idiot. The saw kerf is 1/8" or wider, depending on the type of saw
blade that are used for framing work. Wood expands and contracts with
changes in humidity. This isn't precision machining, where you work to
mill, or a percentage of a mil.
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
Idiot. The saw kerf is 1/8" or wider, depending on the type of saw
blade that are used for framing work. Wood expands and contracts with
changes in humidity. This isn't precision machining, where you work to
mill, or a percentage of a mil.
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
J
josephkk
Guest
On Wed, 23 Jul 2014 08:16:44 +1000, Trevor Wilson
<trevor@SPAMBLOCKrageaudio.com.au> wrote:
Nah, bush the lesser (shrub) was/is a screaming idiot; but Obama sold the
US down the drain (down the river) with three times the deficits that Bush
the lesser managed. Obummer is spending about $1.50 per dollar of federal
receipts. Much more than shrub.
BTW over rabid trade unionism wiped America out, not Raygun.
?-/
<trevor@SPAMBLOCKrageaudio.com.au> wrote:
Nah, bush the lesser (shrub) was/is a screaming idiot; but Obama sold the
US down the drain (down the river) with three times the deficits that Bush
the lesser managed. Obummer is spending about $1.50 per dollar of federal
receipts. Much more than shrub.
BTW over rabid trade unionism wiped America out, not Raygun.
?-/
J
josephkk
Guest
On Tue, 22 Jul 2014 12:57:27 +1000, Trevor Wilson
<trevor@SPAMBLOCKrageaudio.com.au> wrote:
Oh really, alligator breath? How many times have metric nations landed
people on the moon and brought them back home again safely? (zero) I
thought so.
Who puts up the most communications satellites?
The list goes on for quite a while. Also to the point, murica's hayday is
passed and we will be paying the piper ever more for decades to come. Just
like Europe did for a long time. The PIIGS may yet bring the EU down.
Still feeling arrogant?
?-)
<trevor@SPAMBLOCKrageaudio.com.au> wrote:
Oh really, alligator breath? How many times have metric nations landed
people on the moon and brought them back home again safely? (zero) I
thought so.
Who puts up the most communications satellites?
The list goes on for quite a while. Also to the point, murica's hayday is
passed and we will be paying the piper ever more for decades to come. Just
like Europe did for a long time. The PIIGS may yet bring the EU down.
Still feeling arrogant?
?-)
J
josephkk
Guest
On Tue, 22 Jul 2014 08:58:44 +0100, "Gareth Magennis"
<gareth.magennis@ntlworld.com> wrote:
Please be more thoughtful about how quickly you judge. 1.6 mm is just
about best surface smoothness over a 3 to 5 meter range of a wall, not all
that shabby. If you think you can do better than skilled trades workers
just give a try some time.
?-)
<gareth.magennis@ntlworld.com> wrote:
Please be more thoughtful about how quickly you judge. 1.6 mm is just
about best surface smoothness over a 3 to 5 meter range of a wall, not all
that shabby. If you think you can do better than skilled trades workers
just give a try some time.
?-)
L
Leif Neland
Guest
Efter mange tanker skrev josephkk:
My maternal grandfather was a machinist working lathes and making
cogwheels.
My paternal grandfather was a bricklayer.
They had very different views on accuracy.
Maternal grandfather could see "This shelf is 3mm lower on one side
than the other" from across the room
For paternal grandfather "accurate" was within the width of a joint
between bricks.
--
Husk křrelys bagpĺ, hvis din bilfabrikant har taget den idiotiske
beslutning at undlade det.
My maternal grandfather was a machinist working lathes and making
cogwheels.
My paternal grandfather was a bricklayer.
They had very different views on accuracy.
Maternal grandfather could see "This shelf is 3mm lower on one side
than the other" from across the room
For paternal grandfather "accurate" was within the width of a joint
between bricks.
--
Husk křrelys bagpĺ, hvis din bilfabrikant har taget den idiotiske
beslutning at undlade det.
W
whit3rd
Guest
On Monday, July 21, 2014 8:33:57 PM UTC-7, Tom Miller wrote:
Oh, that should be 'run hot especially at no load'. The losses in transformers
might be maximum when NO SECONDARY CURRENT IS DRAWN, because
of core saturation effects. So, it makes sense to power-down at the
input of such a power supply, not at the output.
Oh, that should be 'run hot especially at no load'. The losses in transformers
might be maximum when NO SECONDARY CURRENT IS DRAWN, because
of core saturation effects. So, it makes sense to power-down at the
input of such a power supply, not at the output.
G
Gareth Magennis
Guest
"josephkk" <joseph_barrett@sbcglobal.net> wrote in message
news:s931t956715roish6v5l98ae85bj1rkq30@4ax.com...
On Tue, 22 Jul 2014 08:58:44 +0100, "Gareth Magennis"
<gareth.magennis@ntlworld.com> wrote:
Please be more thoughtful about how quickly you judge. 1.6 mm is just
about best surface smoothness over a 3 to 5 meter range of a wall, not all
that shabby. If you think you can do better than skilled trades workers
just give a try some time.
?-)
In the real world example I gave, i.e. a recording studio, precise
dimensions are sometimes very important.
If the carpenter made a space 1.6mm too small, it could mean that none of
the rack mount equipment would fit in it properly, for instance.
Gareth.
news:s931t956715roish6v5l98ae85bj1rkq30@4ax.com...
On Tue, 22 Jul 2014 08:58:44 +0100, "Gareth Magennis"
<gareth.magennis@ntlworld.com> wrote:
Please be more thoughtful about how quickly you judge. 1.6 mm is just
about best surface smoothness over a 3 to 5 meter range of a wall, not all
that shabby. If you think you can do better than skilled trades workers
just give a try some time.
?-)
In the real world example I gave, i.e. a recording studio, precise
dimensions are sometimes very important.
If the carpenter made a space 1.6mm too small, it could mean that none of
the rack mount equipment would fit in it properly, for instance.
Gareth.
W
whit3rd
Guest
On Thursday, July 24, 2014 7:48:38 AM UTC-7, Gareth Magennis wrote:
Completely wrong. A rack is furniture, its outer dimensions aren't standardized
(though the inner spaces are). So, it isn't a carpenter's job to make a socket
into which the rack fits.
If you need 1.6mm more space, too, you can push the wall that far (wood
frame, of course, not necessarily brick). If there's baseboard molding,
though, you might want to do some more carpentry...
Completely wrong. A rack is furniture, its outer dimensions aren't standardized
(though the inner spaces are). So, it isn't a carpenter's job to make a socket
into which the rack fits.
If you need 1.6mm more space, too, you can push the wall that far (wood
frame, of course, not necessarily brick). If there's baseboard molding,
though, you might want to do some more carpentry...
G
Gareth Magennis
Guest
"whit3rd" wrote in message
news:639627f8-c69f-474e-8c34-1110700104a2@googlegroups.com...
On Thursday, July 24, 2014 7:48:38 AM UTC-7, Gareth Magennis wrote:
Completely wrong. A rack is furniture, its outer dimensions aren't
standardized
(though the inner spaces are). So, it isn't a carpenter's job to make a
socket
into which the rack fits.
If you need 1.6mm more space, too, you can push the wall that far (wood
frame, of course, not necessarily brick). If there's baseboard molding,
though, you might want to do some more carpentry...
It would surely make more sense to measure things accurately in the first
place, using millimetres instead of fractions of an inch, rather than try
and sort out the problems later.
Gareth.
news:639627f8-c69f-474e-8c34-1110700104a2@googlegroups.com...
On Thursday, July 24, 2014 7:48:38 AM UTC-7, Gareth Magennis wrote:
Completely wrong. A rack is furniture, its outer dimensions aren't
standardized
(though the inner spaces are). So, it isn't a carpenter's job to make a
socket
into which the rack fits.
If you need 1.6mm more space, too, you can push the wall that far (wood
frame, of course, not necessarily brick). If there's baseboard molding,
though, you might want to do some more carpentry...
It would surely make more sense to measure things accurately in the first
place, using millimetres instead of fractions of an inch, rather than try
and sort out the problems later.
Gareth.
P
Phil Allison
Guest
"Fred McKenzie"
** FYI there is a much simpler, low tech way to find the internal temp of a
transformer.
1. Measure the primary winding's resistance when at room temp.
2. Make the same measurement ( quick as you can) when the tranny's running
temp has stabilised.
3. Calculate the increase as a decimal factor and multiply that by 254 to
get the temp rise in degrees C.
Eg.
Room temp = 4 ohms
Hot temp = 5 ohms
Increase factor = 0.25
0.25 x 254 = 63.5 degrees C
Add on the actual room temp to get final result.
If the number is over 100C there is cause for concern.
..... Phil
** FYI there is a much simpler, low tech way to find the internal temp of a
transformer.
1. Measure the primary winding's resistance when at room temp.
2. Make the same measurement ( quick as you can) when the tranny's running
temp has stabilised.
3. Calculate the increase as a decimal factor and multiply that by 254 to
get the temp rise in degrees C.
Eg.
Room temp = 4 ohms
Hot temp = 5 ohms
Increase factor = 0.25
0.25 x 254 = 63.5 degrees C
Add on the actual room temp to get final result.
If the number is over 100C there is cause for concern.
..... Phil
M
Michael A. Terrell
Guest
josephkk wrote:
Ask Trevor about Australia's space program...
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
Ask Trevor about Australia's space program...
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
C
Cydrome Leader
Guest
Phil Allison <phil_a@tpg.com.au> wrote:
spiffy trick. thanks.
spiffy trick. thanks.
F
Fred McKenzie
Guest
In article <c3jdv9F4klmU1@mid.individual.net>,
"Phil Allison" <phil_a@tpg.com.au> wrote:
Phil-
This is useful information, but my results did not agree with IR
measurements.
I think my problem was that it is hard to measure low values of
resistance accurately. For my "hot" transformer, cold resistance
measurement of the primary was around one Ohm on a Fluke digital meter.
However shorting the meter leads produced 0.4 Ohms.
After several hours, primary resistance measurement was 1.2 Ohms.
Subtracting 0.4 from both measurements, the increase factor was
(0.8-0.6)/0.6 = 1/3. Calculated rise was 84.7ş C, plus original ambient
24.4ş C gives 109.1ş C.
The IR thermometer measured the top of the transformer laminations.
Initial temperature was 24.4ş C. Final temperature was 53.5ş C. I
could hold my hand on the transformer without screaming, so I am fairly
sure the temperature was nowhere near 109.1ş C!
I think a 4-terminal resistance measurement would provide more realistic
readings.
Fred
"Phil Allison" <phil_a@tpg.com.au> wrote:
Phil-
This is useful information, but my results did not agree with IR
measurements.
I think my problem was that it is hard to measure low values of
resistance accurately. For my "hot" transformer, cold resistance
measurement of the primary was around one Ohm on a Fluke digital meter.
However shorting the meter leads produced 0.4 Ohms.
After several hours, primary resistance measurement was 1.2 Ohms.
Subtracting 0.4 from both measurements, the increase factor was
(0.8-0.6)/0.6 = 1/3. Calculated rise was 84.7ş C, plus original ambient
24.4ş C gives 109.1ş C.
The IR thermometer measured the top of the transformer laminations.
Initial temperature was 24.4ş C. Final temperature was 53.5ş C. I
could hold my hand on the transformer without screaming, so I am fairly
sure the temperature was nowhere near 109.1ş C!
I think a 4-terminal resistance measurement would provide more realistic
readings.
Fred
P
Phil Allison
Guest
"Fred McKenzie"
** It never will as the internal temp of a tranny is higher than the surface
temp - the test gives the average temp of the copper wire - which is
crucial for insulation purposes.
The same test is used in international standards for transformers etc to
establish safe temp rise.
** Not if you pass a known current through the winding and measure the
voltage drop.
Eg: Connect a 10ohm, 10W resistor in series with the winding and adjust a
bench PSU each time to give 10V across the resistor - so you have 1amp. The
voltage across the winding is then the same as its resistance in ohms.
Since you compute the ratio of two readings, absolute accuracy of the
resistor and the voltmeter do not matter.
..... Phil
** It never will as the internal temp of a tranny is higher than the surface
temp - the test gives the average temp of the copper wire - which is
crucial for insulation purposes.
The same test is used in international standards for transformers etc to
establish safe temp rise.
** Not if you pass a known current through the winding and measure the
voltage drop.
Eg: Connect a 10ohm, 10W resistor in series with the winding and adjust a
bench PSU each time to give 10V across the resistor - so you have 1amp. The
voltage across the winding is then the same as its resistance in ohms.
Since you compute the ratio of two readings, absolute accuracy of the
resistor and the voltmeter do not matter.
..... Phil
J
josephkk
Guest
On Sat, 02 Aug 2014 23:58:37 -0400, Fred McKenzie <fmmck@aol.com> wrote:
Yes, you got the 4-terminal one absolutely right. A meter that can use
kelvin clips and the resulting measurements would be much better. This is
normal for resistances under 10 ohms and mandatory under 1 ohm (for 3
reliable digits). For lower resistance or more resolution it gets
progressively worse.
?-)
Yes, you got the 4-terminal one absolutely right. A meter that can use
kelvin clips and the resulting measurements would be much better. This is
normal for resistances under 10 ohms and mandatory under 1 ohm (for 3
reliable digits). For lower resistance or more resolution it gets
progressively worse.
?-)
C
Cydrome Leader
Guest
josephkk <joseph_barrett@sbcglobal.net> wrote:
My mind was blown when I just looked up the street prices of commercial
kelvin clip test leads with banana jacks.
Even the B&K stuff was like $160. Pomona? well over $200. Keithley kelvin
probes? $300+
I'm surprised the audiophile folks haven't come up with some sort of play
on this stuff yet.
My mind was blown when I just looked up the street prices of commercial
kelvin clip test leads with banana jacks.
Even the B&K stuff was like $160. Pomona? well over $200. Keithley kelvin
probes? $300+
I'm surprised the audiophile folks haven't come up with some sort of play
on this stuff yet.