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[Arthur B.]

It depends on you bias voltage....

[Arthur B.]

I'm quite sure it'll deliver enough power to compensate for the transformer losses, but the load impedance would have to be scaled up, possibly in the hundreds...

[Arthur B.]

You mean caridiod? Just use the polar quation in this Wikipedia article. For more info go here....

[Arthur B.]

Of course, that renders the entire amp into a preamp. This begs the question: why not simply make a preamp that models a large poweramp using small signal...

[Arthur B.]

Mostly second harmonic. A PP class B stage will have lots of crossover distortion, at pretty muchh signal levels....

[Arthur B.]

Crossover distortion will fit the bill....

[Arthur B.]

The speaker's 150 watt rating sets the maximum wattage. You could go for 150 watt output stage, but I think 100 watts should be plenty. As a counterpoint...

[Arthur B.]

That's the plate's conductance, not the mutual conductance....

[Arthur B.]

No, that is the transcountance. You could multiply the transconductance by the load impedance to get the gain, though....

[Arthur B.]

The ECC86/6GM8 should work well in the preamp position, although I don't know anything that will work in te output stage with that low a voltage. IMO, the...

[Arthur B.]

Sorry; I meant that they didn't understand that a crossover could be passive as well. At least that's the impression I got from those threads....

[Arthur B.]

They're called interstage transformers....

[Arthur B.]

What does a phase locked loop have to do with a crossover? Anyway, it seems that the crux of the problem is that they can't understand the concept of a passive...

[Arthur B.]

It may be that the bass is increasing when the master volume is turned down.

[Arthur B.]

The harshness may have to do with the cold clipper stage. Replacing the cathode in the third stage with one that biases it into the linear region. Removing...

[Arthur B.]

What do you want at maximum volume?...

[Arthur B.]

A general purpose amplifier could be made by cloning an old PA/bass/HIFI circuit. What sort will depend on how loud you want it to be and what features you...

[Arthur B.]

I suspect this wouldn't be a good idea. Any even hamonics genrated by this assymetry will cause the bass to be muddy sounding....

[Arthur B.]

They're also considerably more linear and tougher than their audio counterparts.



With that much power going into the grids,...

[Arthur B.]

The circuit is called a cascode. It's a transconduntance amplifier. It's used when wide bandwidth and high linearity are desired....

[Arthur B.]

That design pushes the grids of the 12ax7s positive to get its power and bandwidth. They can be biased into the positive grid region, but must be run at low...