[sdiy] A simple 12AX7 vacuum tube tester schematic..

[Roy J. Tellason]

On Thursday 17 January 2008 10:29, David Moylan wrote:
> I used to work for a custom amp shop that used a lot of octal pre tubes:
> 6SL7, 6SN7 and we had to test every one no matter who supplied them.
> 12AX7's and the like were usually better in that regard.

We used to do a lot of work "authorized" by a bunch of different 
manufacturers,  and among those was Marshall,  by way of Korg (Ptui!).  One 
time a customer came in with an amp that had microphonic tubes and on 
ordering some from Korg (Ptui!) we got some in that were both poorly packed 
(one indeed arrived broken) and just as bad as the ones that were originally 
in the amp.

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space,  a critter that can
be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James 
M Dakin