[sdiy] outlet as variac? calling all EEs...

[Martin Czech]

You mean class A single Pentode power stage?  I aggree, but I didn't
think of that. I thought of the usuall push-pull circuit in class B or
AB. Funny, class A means worst case power consumption in the tube/tranny when
signal is off.

Are there any guitar amps with such a power stage, after, say, 1958?

m.c.


:::X-Authentication-Warning: node12b53.a2000.nl: majordomo set sender to 
owner-synth-diy at node12b53.a2000.nl using -f
:::From: Michael Buchstaller <buchi at takeonetech.de>
:::To: synth-diy at node12b53.a2000.nl
:::Subject: Re: [sdiy] outlet as variac?  calling all EEs...
:::Date: Tue, 20 Feb 2001 12:22:13 +0100
:::Content-Transfer-Encoding: 8bit
:::
:::>I'm by no means a tube expert, but the tube diodes *may* have 
:::>a softer characteristic, which means dropping voltage at high output
:::>power, some compression effect, but only if the power stage is 
:::>really under steam, ie. deafening sound levels.
:::
:::Not necessarily. True for push-pull configurations, but single ended
:::amps draw nearly the same current, regardless of the ouput volume.
:::In my own amps i have even noticed that the current goes down a little
:::bit when such an amp is driven very hard (and distorts).
:::
:::
:::-Michael Buchstaller