Electronics > Projects, Designs, and Technical Stuff
Tube circuit
ELS122:
I just connected the 2 tube sides together put a 270k resistor to ground and it worked beautifully until I turn it up to when it really distorts, then it is ear piercingly loud and this also happened before you just had to crank it up more before! what could be the cause or the fix to this?
ELS122:
also, the amplifier tubes are standard ones (not vibration resistant) I have some 6p14p-k's that I'll try swapping in tomorrow!
ELS122:
I changed the power tube and now it’s a lot better but not completely gone, so maybe I need to put the speakers in a different enclosure!
floobydust:
The amp might need less feedback or the presence control is a bit too much.
Moving the volume control to after the first tube would upset the feedback loop here.
You'd have to change how it's done - make the feedback come into the second tube's cathode and flip the output transformer's secondary wires, to keep it the correct phase.
This is commonly how it's done on Fender, Vox, Marshall etc. where the guitar goes right into the first tube- instead of after a volume control, because you already have it in the guitar. So you can overdrive the first tube but keep the amp's volume low.
ELS122:
so the feedback loop needs to be in the same stage as the volume control?
also, I haven't modified any feedback loop, I just connected pins 14 and 13 together whit a 270k resistor to ground
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