[sdiy] pencil tube (6111 & 6112) tremolo/OD pedal idea

[anthony]

A while back I got this thing at a yardsale that had a small PCB with a card 
edge, 2 very small tubes (6111 & 6112) and some other usual tube circuitry 
(2 Pyramid caps that look like paper in oil).

I have no idea what it came from. At first I thought it came from an old 
hearing aid, but then I studied it more carefully and realised that it was 
very unlikely that they would have used that huge slab of silver to mount 
the tubes in a mere hearing aid. The circuit sort of looked like some of the 
old tube op-amps that I've seen, but it doesn't seem compliacted enough.

So anyway, I thought the specs for these tubes (especially their ruggedness 
& size) looked great for using them in a sort of "sleeper" tube-based 
tremolo/overdrive combo. I could fit it all in a smallish stompbox-sized 
box. - especially if I used an 18VAC wall-wart (of which I have one) and use 
a small tranny to step it back up. I was further encouraged by a few 
articles in DIY audio(phile) circles. Supposedly very low microphonics. 
Yahoo.

Wait. I just had a RAD idea. Even though the box I'm putting my little 
spring reverb in is kind of bulky - this circuit board will fit together 
along with a transformer in this box. Could a medium-mu tube drive a 600Ohm 
load?


cheers
aa