Purple glow indicates a gassy tube. Don't try it in your radio. This tube will draw excessive current and can cause other damage.
Sparton 1567 has push-pull output. You can test the radio with only one 2A3 until you have a chance to get a second tube.
Norm
:I was testing the tubes (there are 15 of them) in a Sparton 1567 I'm working on, and I'm not sure what is wrong with one of the two 2A3 tubes from the amp. One tests just fine on my Hickok 534, the other wants the test meter needle to go backwards, and it gives off a real pretty violet glow. I'm sure this ain't good. Can anyone tell me what's probably happened to this slightly expensive tube to make it test this way?(I'm going to go thru this radio and test/replace caps, etc., before I even think about powering it up)
:Thanks in advance///Jeff
:Hi Jeff
:
: Purple glow indicates a gassy tube. Don't try it in your radio. This tube will draw excessive current and can cause other damage.
:
: Sparton 1567 has push-pull output. You can test the radio with only one 2A3 until you have a chance to get a second tube.
:
:Norm
:
::I was testing the tubes (there are 15 of them) in a Sparton 1567 I'm working on, and I'm not sure what is wrong with one of the two 2A3 tubes from the amp. One tests just fine on my Hickok 534, the other wants the test meter needle to go backwards, and it gives off a real pretty violet glow. I'm sure this ain't good. Can anyone tell me what's probably happened to this slightly expensive tube to make it test this way?(I'm going to go thru this radio and test/replace caps, etc., before I even think about powering it up)
::Thanks in advance///Jeff
:Hi Jeff
:
: Purple glow indicates a gassy tube. Don't try it in your radio. This tube will draw excessive current and can cause other damage.
:
: Sparton 1567 has push-pull output. You can test the radio with only one 2A3 until you have a chance to get a second tube.
:
:Norm
:
::I was testing the tubes (there are 15 of them) in a Sparton 1567 I'm working on, and I'm not sure what is wrong with one of the two 2A3 tubes from the amp. One tests just fine on my Hickok 534, the other wants the test meter needle to go backwards, and it gives off a real pretty violet glow. I'm sure this ain't good. Can anyone tell me what's probably happened to this slightly expensive tube to make it test this way?(I'm going to go thru this radio and test/replace caps, etc., before I even think about powering it up)
::Thanks in advance///Jeff
Your test lead is acting like an antenna picking up a strong local station. If this is the case tuning will not have an effect.
Very possible the oscillator isn't operating. Check voltage on pin #5 of your 6A8. Voltage on this pin should be negative when the oscillator operates.
Check plate & screen voltages on other tubes. These should be positive.
Norm
:I replaced all of the caps in the set, and then later replaced all of the large caliber resistors (1 watt and above). It powers up, but all I get is static and garble unless I hook a test lead onto the grid cap or the #4, 5, or 6 pin of the 6Q7G (second det). Then I get the most powerful local station fairly clear. Could it be that one of my IF transformers or some part of the oscillator circuit is dead?
:Any advice (as always)is greatly appreciated!
:Jeff
:
::Hi Jeff
::
:: Purple glow indicates a gassy tube. Don't try it in your radio. This tube will draw excessive current and can cause other damage.
::
:: Sparton 1567 has push-pull output. You can test the radio with only one 2A3 until you have a chance to get a second tube.
::
::Norm
::
:::I was testing the tubes (there are 15 of them) in a Sparton 1567 I'm working on, and I'm not sure what is wrong with one of the two 2A3 tubes from the amp. One tests just fine on my Hickok 534, the other wants the test meter needle to go backwards, and it gives off a real pretty violet glow. I'm sure this ain't good. Can anyone tell me what's probably happened to this slightly expensive tube to make it test this way?(I'm going to go thru this radio and test/replace caps, etc., before I even think about powering it up)
:::Thanks in advance///Jeff
Once again you were dead on the money. The #5 pin on the 6A8 was positive. I pulled the tuning chassis out of the main chassis to take another look. There was a dead .006 cap way up under the assembly that connected the #6 pin to the gang tuning condenser. It wasn't easy to see or get at (I missed it on the first pass when I was replacing caps). As soon as I put another in, every station within 100 miles came in loud & clear on an 18" antenna wire.
Thanks very much for your help (again). My wife says we need to put you on the Christmas card list.
Jeff
:Hi Jeff
:
: Your test lead is acting like an antenna picking up a strong local station. If this is the case tuning will not have an effect.
:
: Very possible the oscillator isn't operating. Check voltage on pin #5 of your 6A8. Voltage on this pin should be negative when the oscillator operates.
:
: Check plate & screen voltages on other tubes. These should be positive.
:
:Norm
:
:
:
:
:
:
::I replaced all of the caps in the set, and then later replaced all of the large caliber resistors (1 watt and above). It powers up, but all I get is static and garble unless I hook a test lead onto the grid cap or the #4, 5, or 6 pin of the 6Q7G (second det). Then I get the most powerful local station fairly clear. Could it be that one of my IF transformers or some part of the oscillator circuit is dead?
::Any advice (as always)is greatly appreciated!
::Jeff
::
:::Hi Jeff
:::
::: Purple glow indicates a gassy tube. Don't try it in your radio. This tube will draw excessive current and can cause other damage.
:::
::: Sparton 1567 has push-pull output. You can test the radio with only one 2A3 until you have a chance to get a second tube.
:::
:::Norm
:::
::::I was testing the tubes (there are 15 of them) in a Sparton 1567 I'm working on, and I'm not sure what is wrong with one of the two 2A3 tubes from the amp. One tests just fine on my Hickok 534, the other wants the test meter needle to go backwards, and it gives off a real pretty violet glow. I'm sure this ain't good. Can anyone tell me what's probably happened to this slightly expensive tube to make it test this way?(I'm going to go thru this radio and test/replace caps, etc., before I even think about powering it up)
::::Thanks in advance///Jeff