Transformer and Static ?
1/8/2011 10:46:55 PMGeorge T(92318:0)
Hi All, have been working on a Gilfillan 501-T. I've replaced every capacitor, mica, triple checked all of the tubes, and replaced all of the resistors. The problem I'm having is STATIC!!! If I turn it on and off several times it will play fine for a few minutes and then start in with the STATIC again. I hooked a Rheostat up to it and if I bring it down to 50 percent the radio plays fine. I'm thinking it is the transformer with the high voltages, we get 124.4 line volts here. What are your thoughts on this delema? Thanks Again, George T
1/8/2011 10:51:58 PMTerry Decker(92319:92318)
:Hi All, have been working on a Gilfillan 501-T. I've replaced every capacitor, mica, triple checked all of the tubes, and replaced all of the resistors. The problem I'm having is STATIC!!! If I turn it on and off several times it will play fine for a few minutes and then start in with the STATIC again. I hooked a Rheostat up to it and if I bring it down to 50 percent the radio plays fine. I'm thinking it is the transformer with the high voltages, we get 124.4 line volts here. What are your thoughts on this delema? Thanks Again, George T
:
Could it be the volume control? Sounds like you've replaced almost everything else. Do you have a signal tracer?
Terry
1/8/2011 11:07:46 PMGeorge T(92320:92319)
::Hi All, have been working on a Gilfillan 501-T. I've replaced every capacitor, mica, triple checked all of the tubes, and replaced all of the resistors. The problem I'm having is STATIC!!! If I turn it on and off several times it will play fine for a few minutes and then start in with the STATIC again. I hooked a Rheostat up to it and if I bring it down to 50 percent the radio plays fine. I'm thinking it is the transformer with the high voltages, we get 124.4 line volts here. What are your thoughts on this delema? Thanks Again, George T
::
:Could it be the volume control? Sounds like you've replaced almost everything else. Do you have a signal tracer?
:Terry
:
I have a signal generator, but the volume and the tone controls are new also. I was going to try another volume control tomorrow. I've never ran into this problem before, it seems like something is generating noise under full power, and the transformer is about the only thing left. I would sure hate to get one and it not be the problem though. The resistors were way out of tolerance and with each one I figured that would take care of the problem but I was wrong.
1/8/2011 11:08:01 PMWarren(92321:92318)
It's possible a bad tube still. The heaters are 6.3 volt. Test on your tube tester with the heater switch turned up to 7.5 or a little more. See if the tube then shows shorts or leakage.
1/8/2011 11:19:43 PMGeorge T(92322:92321)
:It's possible a bad tube still. The heaters are 6.3 volt. Test on your tube tester with the heater switch turned up to 7.5 or a little more. See if the tube then shows shorts or leakage.
:
Yeah I'll give that a try, I really suspected the 80 tube but I tried 4 different ones in the set, also tried 3 of each other tube in the set and it didn't make any difference. But the problem sure acts like a tube problem. I'm getting the 6.3 on the heaters. The radio was playing fine for guite awhile then started this. I had recapped it and replaced the controls a year or two ago. I checked all of the existing caps they were fine. So that is when I started in on the resistors and mica's.
1/9/2011 12:33:57 AMWarren(92327:92322)
Could back trace this problem with a signal tracer. Or disable one section at a time. Like take the grid cap off the 75. If the static is still there. It's in the output tube circuit. Or power supply.
1/9/2011 1:33:44 AMGeorge T(92330:92327)
:Could back trace this problem with a signal tracer. Or disable one section at a time. Like take the grid cap off the 75. If the static is still there. It's in the output tube circuit. Or power supply.
:
:
Didn't think of that Warren, will give it a try. Thanks for the info.
1/29/2011 8:28:50 PMGeorge T(92948:92330)
::Could back trace this problem with a signal tracer. Or disable one section at a time. Like take the grid cap off the 75. If the static is still there. It's in the output tube circuit. Or power supply.
::
::
:Didn't think of that Warren, will give it a try. Thanks for the info.
:
:
Well it did end up being the transformer replaced it and the radio lost all of the static. Who would have thought. Anyway thought I'd let you guys know. Thanks, George T.
1/29/2011 9:47:08 PMTerry Decker(92949:92948)
:::Could back trace this problem with a signal tracer. Or disable one section at a time. Like take the grid cap off the 75. If the static is still there. It's in the output tube circuit. Or power supply.
:::
:::
::Didn't think of that Warren, will give it a try. Thanks for the info.
::
::
:Well it did end up being the transformer replaced it and the radio lost all of the static. Who would have thought. Anyway thought I'd let you guys know. Thanks, George T.
:
:
Sometimes ya just gotta stick with it 'til ya get it.
Congratulations-
Terry
1/31/2011 1:09:22 AMGeorge T(92973:92949)
::::Could back trace this problem with a signal tracer. Or disable one section at a time. Like take the grid cap off the 75. If the static is still there. It's in the output tube circuit. Or power supply.
::::
::::
:::Didn't think of that Warren, will give it a try. Thanks for the info.
:::
:::
::Well it did end up being the transformer replaced it and the radio lost all of the static. Who would have thought. Anyway thought I'd let you guys know. Thanks, George T.
::
::
:Sometimes ya just gotta stick with it 'til ya get it.
:Congratulations-
:Terry
:
You got that right, everytime you run into some odd ball problem it just helps you in the long run. Thank You All For Your Help, George T
1/31/2011 12:33:03 PMLewis L(92975:92973)
:::::Could back trace this problem with a signal tracer. Or disable one section at a time. Like take the grid cap off the 75. If the static is still there. It's in the output tube circuit. Or power supply.
:::::
:::::
::::Didn't think of that Warren, will give it a try. Thanks for the info.
::::
::::
:::Well it did end up being the transformer replaced it and the radio lost all of the static. Who would have thought. Anyway thought I'd let you guys know. Thanks, George T.
:::
:::
::Sometimes ya just gotta stick with it 'til ya get it.
::Congratulations-
::Terry
::
:You got that right, everytime you run into some odd ball problem it just helps you in the long run. Thank You All For Your Help, George T
Sometimes, you get a million dollar education, a quarter at a time and and unpleasantly inserted.
Lewis
:
:
1/31/2011 4:46:21 PMMarv Nuce(92980:92975)
Lewis,
Now that is classic!! Classic I say!!
marv
::::::Could back trace this problem with a signal tracer. Or disable one section at a time. Like take the grid cap off the 75. If the static is still there. It's in the output tube circuit. Or power supply.
::::::
::::::
:::::Didn't think of that Warren, will give it a try. Thanks for the info.
:::::
:::::
::::Well it did end up being the transformer replaced it and the radio lost all of the static. Who would have thought. Anyway thought I'd let you guys know. Thanks, George T.
::::
::::
:::Sometimes ya just gotta stick with it 'til ya get it.
:::Congratulations-
:::Terry
:::
::You got that right, everytime you run into some odd ball problem it just helps you in the long run. Thank You All For Your Help, George T
:
:
:
:
:
:Sometimes, you get a million dollar education, a quarter at a time and and unpleasantly inserted.
:Lewis
::
::
:
: