5V filament winding connected to secondary of output transformer?

[Suncalc]

1.2mV across an 8Ω load is about -68dB. Do you really need to push it down further?

 

[Kay Pirinha]

Trying to reduce 100/120 Hz mainly sawtooth hum by inserting some 50/60 Hz sinusoidal signal into the output is a bad crutch, I'd say. OTOH, I don't have any idea about any other intention.

Best regards!

 

[Chris Hornbeck]

And I'm sorry to poke fun at the person who built this, but the photos in post #5 tell a tale. I'm only glad that I've never, ever made a mistake. Except for that time that I thought I might be wrong. That was foolish.

Always the best,
Chris

 

[egellings]

Trying to reduce 100/120 Hz mainly sawtooth hum by inserting some 50/60 Hz sinusoidal signal into the output is a bad crutch, I'd say. OTOH, I don't have any idea about any other intention.

Best regards!

Agree. The two waveshapes don't match, so cancellation will not occur completely.