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In Reply to: RE: Theta tube preamp posted by louie3 on September 04, 2014 at 13:16:41
The Theta uses capacitance multipliers instead of regulators, notice there are no voltage references, ie zeners. The combination of the two series resistors to the left of the transistors set the output voltage of each multiplier. What is the voltage at the junction of the first two resistors?
Craig
Follow Ups:
Waiting for the transistors to arrive...sometime next week. I will replace the transistors and check the resistors, but I am fast approaching the point where somebody who actually knows what they are doing should probably take over the job.
Hopefully, if the transistors don't fix the problem, I can find someone who will work on the preamp.
If you cannot find anyone local you can email me and I can probably fix it for you. Sounds pretty straightforward since we know the power transformer is OK. The rest is just working through the circuit. I suspect the transistors will fix it.
Good luck,
Don
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