• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

yagoolar's tube amp projects

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what does two secondaries mean ?

See attached picture. One can connect primaries and secondaries in series or parallel.
 

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I think I reached the optimal schematic. So I start building a prototype.

First approach of a look below
 

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Is that high value for R3 necessary? Did the C3G suffer from oscillation?

Is there no noise issue on the 6C4C cathode with all those LEDs?

Soldering is ahead of me. That is also my first experience with C3g - so your question is to be answered.
As for LED - I replaced RC cathode bias with LEDs and there was a huge improvement. I did not measure noise though.
 
I am rebuilding the existing amp with LED bias, yet improving / experimenting with some elements i.e. filament power supply and driver stage. I decided to leave output stage bias as is. If I went to fixed bias I would have to change at least mains transformer, add another regulator. And then I would end up with another enclosure, and that would be new amp. I have 2 more projects on the table: SET w/300b and PP w/6C4C. So perhaps then.
 
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