22 Jun
2004
22 Jun
'04
2:03 p.m.
Does anyone know how "cross talk" was
avoided
in these
valves (aka tubes).
Just look at a typical duo-triode - each triode has a plate that almost
completely envelopes the inner grid and cathode structure. The voltage on
one plate has only a tiny, tiny effect on the other plate, as it is not in
the path of the electrons, where it would act as a grid.
Of course, someone had to break the rules, and one of the early attempts
to get around the RCA patents was to use another plate as the control
electrode. These tubes, for the most part, didn't work (many were actually
scams).
Then, just months ago, one of the tube nuts managed to get a 6AX5GT to
amplify. For those not in the know, a 6AX5GT is a dual rectifier. Read all
about it in last month's issue of *Tube Collector*.
William Donzelli
aw288(a)osfn.org