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New build completed. Checked all connections and solder joints. Turned on, on stand by, no tubes in, took reading at pin 5 on power tube socket expecting the -30 to -60 neg DCV and instead I get -346v on one and -.46v on the other. What the ?
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Did you measure the right pin? (If you did, then go back and check your wiring)Building a better world (one tube amp at a time)
"I have never had to invoke a formula to fight oscillation in a guitar amp."- Enzo -
There shouldn't be any voltage at all on pin 5 of the 6v6 sockets in a 5e3. Unless you've added a fixed bias supply? How about a schem? We can't know anything looking at a 5e3 schem because it's cathode biased."Take two placebos, works twice as well." Enzo
"Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas
"If you're not interested in opinions and the experience of others, why even start a thread?
You can't just expect consent." HelmholtzComment
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Sorry. Heres the schematic. It is a modified 6L6 design from Ted Weber.Attached FilesComment
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With no tubes in there should be nothing connected to pins 5 the bias tap. That should certainly narrow the search. There must be a mistake in the wiring. Wire color codes are usually accurate. But not always."Take two placebos, works twice as well." Enzo
"Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas
"If you're not interested in opinions and the experience of others, why even start a thread?
You can't just expect consent." HelmholtzComment
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Please can we have a list of all dc voltages at power tubes & preamp tubes, plus good pics of tube socket wiring? AC heater voltages to.
If you had built the amp to the schematic, then it would work, therefore there must be a difference between what you have and what the schem shows...so we need to see the amp itself.Comment
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