Sure. But my suggestion to check the tubes was made because this amp was dead silent before the feedback mods, according to builder.
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Normally one would look first at the changes that usually caused the issue. The tubes were OK and haven’t been changed.
However, I think I pointed out in post #4830 quite some points where things can be made as they should be. It seems the changes uncovered some existing imperfections. It is hard(er) to solve issues with introduction of new variables. First basic rules and troubleshooting.
No offence but it would be a miracle if the device was dead silent. Dead silent = as in the semi world so ears before the woofer and no hum.
However, I think I pointed out in post #4830 quite some points where things can be made as they should be. It seems the changes uncovered some existing imperfections. It is hard(er) to solve issues with introduction of new variables. First basic rules and troubleshooting.
No offence but it would be a miracle if the device was dead silent. Dead silent = as in the semi world so ears before the woofer and no hum.
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Miracles happen apparently. Because as you can read in earlier posts he says it was dead silent. So if you pull out tubes and insert them...that might take em over a threshhold. But that is just guessing....ofcourse. I had tungsol 6v6...after a while of use...white flakes were loose inside the tube....pulling them out and laying them flat may have caused something...Anyway... All is well that ends well. I'm sure he'll get it dead silent again.
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ok...ok....maybe I was exaggerating a bit....but 15db version was enaught quiet...only little buzz if I put my ears near drivers....
now it's annoying from listening chair...
BR,
Goran
It's really strange, I will look for to check the parts involved in the change like others pointed.
hm, I was only changing resistors nothing else...Takman and AMR are now and Holco from output to ground...
BR,
Goran
As thought. You will have to some work. Boutique parts won’t solve matters (at all). Replacing parts is the last thing you should do right now.
It was just about rearranging some resistors in the original 6V6 golden chassis. Many shots of it already in the thread. Especially towards the start.
I don't know... You guys burn amps there and I am scared! 🤣
I don't know... You guys burn amps there and I am scared! 🤣
Could any of you post a validated real life (unregulated) power supply schematic ? For the G3X 6v6 NFB version please .
This one is a working design in a G3X. No failures in two years since installed. Not a regulator. Fixed voltage reference capacitance multiplier ripple filter. You could also add a 220R stopper next to the Mosfet's gate pin for good measure.
