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

[jpdesroc at oricom.ca]

My tube tester is a B&K Dyna-Jet 707 
Like this one:
http://cgi.ebay.com/Vintage-Working-B-K-Dyna-Jet-707-Tube-Tester-55899
9_W0QQitemZ140198084338QQihZ004QQcategoryZ132QQssPageNameZWDVWQQrdZ1QQ
cmdZViewItem

and is in very good condition.
The problem with this tester is that
for the 12AX7 the manual says:
GOOD if it reads 22 or more on
a 120 scale!! Most tested 12AX7's go
from 15--23..! Not quite acurate.
I don't want to mess around with the internal
circuitry to get a better reading.
So I'd like to get opinions about my
idea of building a standard stage to test
the 12AX7 gain as detailed in my previous post.

J-Pierre