In a message dated 11/1/00 5:52:38 PM Eastern Standard Time, sjhel@...
writes:
I checked out the SND tube sales site the other day & discovered that
Tektronix used to make a valve curve tracer (the 570). I do quite a
lot of work on old valve equipment, (usually fixing guitar amps for
friends) & it would be great to test the valves I have to see how
well they match. Many amps that come in have an assortment of valves
where one has been replaced when it has finally expired instead of a
new matched set being fitted.
The 570 is a very rare item even here in the US. A friend of mine had one and
sold it to a collector for a quite high price. You can see that very unit on
the cover of Alan Douglas's "Tube Testers and Classic Electronic Test Gear".
According to the book, only about 1000 were made over a period of ten years,
starting in 1956.
Mike Csontos
