The Amp Garage

I hate to say it but having the output transformer that close to the preamp tubes may create problems.

In general, how does one determine the rated output power of a tube amp? In my particular case, I am looking at a pair of EL34s vs a pair of KT66s in a push-pull configuration. At a high-level, both of these tubes are rated for 25 watts dissipation; so naively, one would think a pair would make for...

I notice that there’s no coupling caps before the 330k and 100k mixing resistors originally. Are you 100% certain that the signal bleed you talk about is not a normal condition of the amp?

The Trainwreck is about 482hz.

I’ve never actually heard crossover distortion in a tube amp but I’ve observed it many times while watching the output waveform. On a tube amp it’s usually subtle and right at the point of clipping and never gets to be more than a slight turn in the center point of the sine wave until clipping is he...

I built an amp with 3 12ax7 and 2 EL84 using that transformer. It didn’t sweat it. Like I said before it’s the HT winding that’s saggy.

I think the heater supply is adequate for what you’re asking. The HT winding is kinda saggy and using it for more than 2 EL84 or 2 6v6 would probably not be advisable or I should say maintaining the 8k output transformer impedance would be best.

A Trainwreck Express with el34 has a harmonic content that fills the room giving the perception of volume louder than the actual power output. I am going to have to say that you most probably haven’t played a 100 watt Marshall through a 4 x 12 or a full stack. I say this because while a Trainwreck i...

I just hook the transformer up to 120 volts ac through a variac and test secondary voltage output after doing simple resistance/continuity tests for verifying no shorted windings and confirming wire/winding groups. I’ve heard something about the bulb test but you’re kinda making it act like an ignit...

I think you’re problem is lead dress creating an oscillation but running a 6V6 like a 6L6 or EL34 doesn’t make sense to me. Put EL34’s in it unless you built an amp around a power transformer that can’t support the heater current but then I’m confused with the transformer design. Usually high voltag...

Actually they are 6v6 but they do tend to handle more voltage. They don’t have the ability to pass the current of a 5881 and aren’t built to do that. This is why they are referred to as 6v6. You’ll notice the cathode tube is much smaller.

I wish people would stop calling full wave bridge rectifiers a doubling circuit. Simple circuit analysis would provide enough evidence that the voltage is only rectified from AC to DC. A simple calculation of DC volts divided by AC output would prove that it’s simply close to peak positive voltage. ...

The bias pot doesn’t directly affect the voltage of the phase inverter. It’s the power supply dropping resistors. You’d need to put a smaller value dropping resistor between the choke and the phase inverter supply.

I’ve read and interacted with all the conversations on every forum you’ve posted on. It’s clear that you don’t have the capacity to understand. Case in point is the lack of realizing that sustain through a pedal is different than the feedback generated from the interaction of vibration between the s...

No!!! Enough Already!!! What’s it going to take to get this through your thick skull? You’re just like some people that won’t do their own homework. I’m finished Please everyone, stop feeding this codependent relationship. Wean him from the tit! Make him sleep in the crib! Everything he needs is ava...