Tube Amp Archive

martin manning wrote: ↑Sat Nov 09, 2024 10:07 pm Easy enough to tack a cap in and try it out.

Done exactly that, the amp seems to be a bit darker/less gain with the capacitor in the circuit, almost like a plexi presence control has been turned down slightly…

trobbins wrote: ↑Sat Nov 09, 2024 9:24 pm Yes tonally the amp may oscillate wildly and grossly depending on the speaker and leads used - its called unstable operation.

I guess I should install the cap then! I wonder why so many of these amps are out there without the cap though…

The 3K3||2n2 from output secondary to PI is the global negative feedback loop. The resistor sets the amount of NFB and the cap helps shape the frequencies fed back to the PI. Yes, because one end of the output secondary is grounded, the other end of the winding will appear to be grounded also, beca...

Hey guys! I'm very new to changing things on amps and want to learn as much as possible, so sorry in advance if any stupid questions here... I recently get an old Selmer Zodiac Twin 30, the schematic says there's a 0.0022uf Cap in parallel with a resistor before going to the output, after looking at...