Quote:
Originally Posted by Tubejunke
So are emissions tests and mutual conductance really not important in troubleshooting?
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Lets back up a bit......
Before doing anything else (most the time) I could turn around
& pull a new tube from a shelf 8' long & 6' high packed with tubes.
That & the TV is the best tube tester. The hobbyist rarely has that
option. The tester is useful but has limitations.
They will not take a 6HA5 & see if it amplifies at 200 mc.
Nor a 6EA8 & see if it oscillates at 200mc.
It wont run a 6LB6 with 1KV spikes & 300ma cathode current.
It will find
open filaments
dead shorts
some intermitant shorts ( hold the tube in & flick it with your
finger nail or tap with something)
emission (can be low & still work fine)
Bottom line is use it but assume it may be lying. It can help you
or get you spending time & $$ for not.
73 Zeno
