JohnnyCreepy

It is more boring nowadays. Should’ve taken photo yesterday. But yeah, whole layout was the first attempt and def a learning...

Here’s 1Kohm + 1nF between PT sec, no other changes. Hum only audible when master vol is dimed. Doesn’t bother me anymore on rehearsals...

Problem solved. Adding the MV potentiometer required me to run a long cable between the slider of that MV potentiometer and the grid...

And cap casings should be treated live and containing voltage when amp is unpowered and this is to be considered with one cap...

Could be related for lead dress with certain resistance settings on following tubes grid making the master vol pot wiring to pick up...

And It shows exactly my 300V and 200V. Your tool is excellent and confirm exactly my mistake. 👍 And the 0V at grid of V2b is probably...

My tool shows DC in yellow. You are between a cap and ground there so 0DC is expected. What you have is a severely unbalanced PI that...

Haven’t messed with see-saw floating paraphases, but above is what the bible has to say of your PI. Balance is greater with fig.12.35...

If I think back, the hum may have started when I replaced stock BY328 diodes on the rectifier with more modern ones. I’ve tried 5408 and...

Update: Different speaker, but it’s getting better Hz by Hz and dB by…you got the idea. So what caused this LF reduce? Went in and...

Saga of The hum which bothers continues! Most recent tweaks: Redid input stages component layout, changed vol pots for sturdier ones...

Okay, choke went in as planned and when I was chassis open had a thought to add ceramic 100pf bypass caps for V1 anode resistor. It...

New PT and 4H choke with 400mA rating arrived today, but pity me about figuring PT lead as no tap markings on this one. DC resistance...

Amazing idea and just what I need! Gonna give it a try and report back. Add Superbass with 390-390-0-55 trafo for it and I’ll measure my...

Bought a new PT for this one. Gonna move old PT to the other British 4xEL34 amp which doesn’t have proper one. Specs for new PT: Pri 0...