[sdiy] tube amp

[Ken Stone]

>I'm making a monoblok amp from 3 EL84's. I'm using an oscilloscope chassis 
>that seemed perfect for the job since it already had all of the sockets and 
>power supply. The thing is, it has a 1500V section on the power supply for 
>the 'big' tube. I'm just wondering what would be the best way to make this 
>safe(r).

If it's a flying lead, crimp it into a blind wire joiner (The sort that take
both wires in one end, and are sealed at the other), then add your dab of
silcone sealant. 

>I thought if I could think of something interesting but mostly 
>useless that might help, but I'm at a loss for what. Or would it be OK to 
>just goo the wire up in some RTV silicone stuff?

The other aplication for it would be .... eht for another "big tube: :) some
amps include a CRO screen for displaying wiggly patterns for the fun of it.
Look for home made audio ams on the web.

>Also you think one 12AX7 is enough gain for a guitar (harmonica/synth) amp? 
>I thought about putting a 12AU7 too. 

One is. Two and you start having real microphonics problems. The second
12AX7 amplifies all the noises from the first! Don't forget that there are
two stages of amplification in a single 12AX7.

Ken 
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au or sasami at cgs.synth.net
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>