Re: well maybe you can rock it out... with 18 watter... maybe

On 3/24/2010 4:56 PM, Stephen Cowell wrote:
"Jim"<askme@xxxxxxxxxxxxxxxxx> wrote
Here's what I'm saying:

All ya gotta do is set a 40W amp so that it distorts at full master
volume. No harmonic distortion meter, YOUR EARS. Not distorting at 5 or
six, like a lot of amps will do. Distortion at 10.

Preamp, or poweramp, or speakers? Booster pedal engaged?

Yeah, I could've worded it clearer, but I said "set so it distorts AT FULL MASTER VOLUME." ...meaning with master at 10, then dial up preamp until you hear distortion. But I see your point.

And the speaker distortion is a good point. I guess I did ignore the possibility that the speakers could be distorting. But wouldn't that make it even more likely that there's under 15W once you got to "3" on the master?

Here are a couple more "flaws" in my original thought:

The player would also have to keep pick attack fairly constant (to get a uniform input signal).

And... The results will be influenced by the listener's ability to HEAR the onset of power tube distortion. If you're ears say "now" at 8%, and I hear it at 2%, the results will be very different.

But still...


Then drop the master to 3.

Do we have to hold all other controls the same?

Of course.

Why or why not?

Seriously?

What good is a comparison if you change another variable? It was so "common sense" to me that I didn't mention it.

Plus, if you raised the preamp volume, you another stage prior to the output tubes.




If it's 40W and distorted at right as it approaches 10, it will be less
than 15W at 3.

That's all I was saying.

It might be less than 3w. It might be 20w.


I'd sooner bet on under 3W than over 20W.

Nothing you've said is sufficient info to tell.

I'm not sure if you got the first point "at full master volume."

I've built amps with 1M linear master pots
that would still be screaming at 3.

Okay, I wouldn't make my previous bet on THAT amp with a linear MV pot. But your amp would have WAY less output with the common audio taper.

Like less than 1/3 full output?

....THAT was my point: "If it's 40W and distorted at (sic) right as it approaches 10, it will be less than 15W at 3."
.

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