Testing 6146B/8298A with a 177/b
jstrohm at TEXAS.NET
Tue Aug 1 11:39:38 EDT 2000
Marco thus spake:
>I have been fighting with a SB-401 heathkit transmitter, and I have come to
>the conclusion that the finals (6146B/8298A) are probably defunct. I
>tested them with a simple emission tester and, although barely, they pass
>as "good". I 'd like to use my transonductance tester, however, for a more
>reliable test. Problem is I don't have the settings for these tubes. Nor
>does the extremely detailed collection of test setting prepared by Nolan
The late, lamented magazine Ham Radio published plans for a very simple
6146 tester that gave a reasonably good indication of transconductance
(though not a calibrated one) that was good enough to make matched pairs.
If you or anybody on the list would like, I could put a copy out on the web.
IIRC, it took only a transformer, a resistor, a capacitor, a milliammeter,
a switch and a socket.
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