I have always found that tube testers only find bad tubes, but never good
ones. Always test RF tubes in-circuit for proper operation at the Fo.

Tube life for sweep tubes in RF amps should be rated in milliseconds. Ah
the good old days when Radio Shack had Lifetime tubes and free battery
cards.

Jim, ac6tk
http://tekstuff.freespaces.com


"Scott Dorsey" wrote in message
...
In article ,
Charles wrote:
Does anyone know the settings on a Hickok Model 800 to test a 6JB6?
Thanks

That's a 9QL pinout. Same pinout as the 6JE6, 6JF6, 6JU6, 6KM6, 6LQ6,
6LZ6, 6ME6 tubes. If you have any of these listed on the chart, set
the switches up the same way.

I _think_ the bias setting should be the same. So get a known-good 6JB6,
put it in, and adjust the shunt until the meter reads good. Now try your
unknown tubes in there.

Don't trust this sort of back of the hand estimate for exact
transconductance
values, but for a rough go/no go, you should at least be able to cull out
the tubes that have substantially lower transconductance due to low
emission,
shorts, or badly damaged elements.

God, how I hate sweep tubes...
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."