stumped
Moderators: pompeiisneaks, Colossal
stumped
Hello, I have a Schumacher PT with a tube rectifier. On pins 4 and 6 I get 375vts but I get 0vts on pins 2 and 8. I even bypassed the standby switch. I have tried a solid state plug in and several 5y3s. Any help would be greatly appreciated! Thank you.
Re: stumped
What have you got connected to the heater/cathode pins? Are you sure your PT has a 5VAC filament tap? (Pardon me for asking).
Re: stumped
This PT came out of a Lowery organ and there were some mystery wires but I left the heater and rectifier wiring intact.
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skyboltone
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Re: stumped
With a center tapped transformer you would measure between ground and pin 8. Not between pins 2 and 8. Is that what you're doing?andrew wrote:Hello, I have a Schumacher PT with a tube rectifier. On pins 4 and 6 I get 375vts but I get 0vts on pins 2 and 8. I even bypassed the standby switch. I have tried a solid state plug in and several 5y3s. Any help would be greatly appreciated! Thank you.
The Last of the World's Great Human Beings
Seek immediate medical attention if you suddenly go either deaf or blind.
If you put the Federal Government in charge of the Sahara Desert, in five years time there would be a shortage of sand.
Seek immediate medical attention if you suddenly go either deaf or blind.
If you put the Federal Government in charge of the Sahara Desert, in five years time there would be a shortage of sand.
Re: stumped
Yes. I just now eliminated the tube rectifier and I attached the two 375v leads to two diodes joining at the first filter cap. At the junction of the two diodes and the filter cap I still get 0vts.
Re: stumped
Does the transformer have a center tap on the secondary? It needs to be grounded in order for the diodes (either tube or solid-state) to work.
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skyboltone
- Posts: 2287
- Joined: Wed May 10, 2006 7:02 pm
- Location: Sparks, NV, where nowhere looks like home.
Re: stumped
If it is grounded then I think it's open inside the transformer. An odd occurance but one that could easily happen I think with a shorted cap. You may have to open the transformer and see if the solder melted where the ct hooks up to the winding wire.Firestorm wrote:Does the transformer have a center tap on the secondary? It needs to be grounded in order for the diodes (either tube or solid-state) to work.
I take it you have 375VAC between the two outside taps. You should see half that between the center tap and either side. Or, alternately, you could leave it unplugged and make sure that you have continuity between the center tap and each outside leg. Something on the order of a 30 to 150 ohms or so.
The Last of the World's Great Human Beings
Seek immediate medical attention if you suddenly go either deaf or blind.
If you put the Federal Government in charge of the Sahara Desert, in five years time there would be a shortage of sand.
Seek immediate medical attention if you suddenly go either deaf or blind.
If you put the Federal Government in charge of the Sahara Desert, in five years time there would be a shortage of sand.
Re: stumped
Sounds like it is not center tapped. You'll need to use a bridge rectifier.
Re: stumped
I think it would help to see a picture of the business end of the PT. See if you can shine enough light on it so we can see the wire colors.