Tube tester

Hi all,

I just bought a Accurate Instrument Co. Tube tester Mod 257 at a flea market for $30 .
the case is in fairly good condition and the tester works . I tried testing one of the KT 88 tubes
on it and shows good . What i wanted to know is anyone familiar with this one and is it any good.
from schematics on line a test voltage of 25v is applied .I would like some input on this tester .

I've been a member of this forum for a while i guess since i bought one of Bobs ST-120 kits . I love
it . I think its the best out there and got lots of balls of output . I bought the ST 120 kit the
first of the year .This is my first post.

Dave

Hi Dave,
For $30 you done good but be aware, it is a simple emission tube tester that will most part weed out the bad tubes but you cannot match tubes with it.

Now I own over 20 tube testers and use my emission tube testers for quick tests, more so on antique radios but when I test audio tubes, I use a mutual conductance tube tester.

Regards,
Sal

Thanks Sal,

I should have known but didn't give it a thought . But since the ST-120 has separate bias adjustments
for the output tubes i wasn't too picky on the tube matching . The mutual conductance TT's are
a little pricey for me to buy just to have for only the ST-120 tube type audio component i have
in my music system .In my younger years i probably would notice the difference but at 65 my
ears aren't as good.I'm using a Carver SS tuner/preamp to feed the ST-120 so i don't do
too much tube rolling .If the Carver breaks then I'll buy a tube preamp kit then probably a
mutual conductance would be good.~Dave

Mu matching in an phase splitter is very important.


Steve