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London Power's Power Supply for Preamps (PSU-PRE)
#9
Hi John

One other thought: make sure QP1 is MPSA92 NOT -42. use lots of light and a magnifier to read it. The wrong sex BJT could give high output or no output.
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RE: London Power's Power Supply for Preamps (PSU-PRE) - by K O'Connor - 04-10-2021, 07:45 PM

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Come in where it's warm!
A warm welcome to tube amp modding fans and those interested in hi-fi audio! Readers of Kevin O'Connor's The Ultimate Tone (TUT) book series form a part of our population. Kevin O'Connor is the creator of the popular Power Scaling methodology for amplifiers.
Please remember these three principles: respect, sharing, community.
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