[Boatanchors] Testing 845 Tubes

[Ian Wilson]

GE Ham Tips has a useful article on transmitter tube testing, using a
Hartley
power oscillator. I've used this effectively on a number of triodes,
tetrodes, and
pentodes.

I would imagine the 845/211 would oscillate happily at a few MHz if you
scaled
the values from the GE article.

One nice feature is that all the tubes I've worked with will take off at far
less than
the typical voltages used in real operation; so you can use a simple
variac-controlled
power supply to ramp the plate voltage up until oscillation starts (or the
tube appears
to be bad).

Apart from the power supplies, only a few components are needed. The
relevant GE
Ham Tips numbers are on the web somewhere, I'm sure someone on this list
will be
able to point to them (perhaps even on the BAMA mirror).

73, ian K3IMW