"Tim Williams" wrote in message
...

"Charlie Richardson" wrote in message

...

Most of the ones I have seen

to date are too high power (over 300 milliwatts) .



Hwa?!?! Why would you want such pitiful not-even-flea power?



What I would like to do is to get authentic "cranked" guitar amp power tube
distortion at very low volume levels and in a very small inexpensive
do-it-yourself package. A small amp like this could be used for low volume
practice, could be mic'ed (the isolation box for a tiny speaker would be
pretty easy), and/or just isolated with a line-out for doing whatever with.

For that much, a couple 12AU7s as white cathode follower would work.

A 12AX7 will *not* work because it has a *very* high impedance for

iron to work with, and quite simply just doesn't do any current.

Though you might be able to do something with grid current I suppose.

(My 1976 ARRL handbook lists it as 300Vp, 16k Rl, zero-bias class B2,

7.5W output!! At 40mA full signal vs. 14mA none, it's probably closer

to AB2, but in any case it's got some nice efficiency! Oh man, two

in parallel, that's 8k p-p Rl and 15W.. throw in a 5687 CF driver and

this could be sweet..!!

There are some projects on www.headwize.com (headphone amps) that might
work. Most are for output transformerless designs but some are not -- the
idea is to get a true "power tube cooking iron" big guitar rig sound in a
tiny package, so we need the whole enchilada including transformer (sized to
get authentic tranny saturation) and speaker.

Thanks very much for your reply!

-Charlie





Tim



--

In the immortal words of Ned Flanders: "No foot longs!"

Website @ http://webpages.charter.net/dawill/tmoranwms

"Charlie Richardson" wrote in message
...


What I would like to do is to get authentic "cranked" guitar amp power
tube
distortion at very low volume levels and in a very small inexpensive
do-it-yourself package. A small amp like this could be used for low volume
practice, could be mic'ed (the isolation box for a tiny speaker would be
pretty easy), and/or just isolated with a line-out for doing whatever
with.



** 100 mW into say a 4 inch speaker will sound pretty pathetic on
guitar, no matter what - a Pig Nose would blow it away completely.
Small and cheap = SS and not tubes.



............. Phil

"Phil Allison" wrote in message
...

"Charlie Richardson" wrote in message
...


What I would like to do is to get authentic "cranked" guitar amp power
tube
distortion at very low volume levels and in a very small inexpensive
do-it-yourself package. A small amp like this could be used for low
volume
practice, could be mic'ed (the isolation box for a tiny speaker would be
pretty easy), and/or just isolated with a line-out for doing whatever
with.



** 100 mW into say a 4 inch speaker will sound pretty pathetic on
guitar, no matter what - a Pig Nose would blow it away completely.
Small and cheap = SS and not tubes.

100 mW wouldn't sound that bad into a 12" extension speaker, though, if you
wanted to use it as a bedroom practice amp, and having low power and a
small speaker would make it really easy to do a small isolation box with a
mic. The idea would be more to use it more for an in-line "effect" and go to
another amp or PA, rather than listen to it directly. Something really small
would also be able to be mounted on a mic stand and you could get real close
for feedback effects, etc.

-Charlie



............ Phil