Ian Iveson wrote:

"Patrick Turner" whinged:

In other words, depending on bias and RL, which you have not
mentioned,
an AC30 will stay in class A for a large% of the power, and cross
over into
class AB if RL is low.
...cut rest of obfuscating BS

The specification of the AC30 includes its load, silly, and its bias
is not adjustable. An AC30 combo comes with its specified load
attached (inside, behind the cloth on the front). You are babbling
stupidly to cover up for your ignorant blurting, Mr Professional.

Well Mr Rank Amateur, you have not worked much on these things.
I assure you the AC30 has a lot more class A than nearly all other
guitar amps I have ever seen.
Its sound afaiac, is well liked by musos in the know.
Pentodes such as EL84 with a high bias current
and zero loop NFB overload like a nice gooey compressor.

And one can load the amp the way one wants to, but
the last one i had here for repairs due to blown tubes
etc **did** have very substantial class %.
The nominal speaker load is only that at one F, and either side rises
for bass resonance and for the voice coil inductance.

Patrick Turner.





cheers, Ian