Fred -
I have been traveling and missed some of this thread. Try subbing tubes
in the AVC stages. Often an IF tube will be gassy, and the grid will
"lose control" after 5-20 minutes of warmup. The 12BA6 is particularly
susceptible to this problem, even in "New Old Stock" tubes. You
sometimes have to try three or four before finding a "good" one. The
AVC circuit is so hi-z that it takes very little grid current to upset it.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>
py...@integral.com.br wrote:
Dennis, merry xmas to you and yours, firts of all.
Thanks for the input. I don not know if I my explanation was clear
enough. The long S-meter journey to S1 just occurs after power the
unit up and for 10 or so minutes. After that the behaivor is normal.
Yes my first shot was a opened path to discharge the AVC circuitry.
Unfortunately I have not found anything to blame. Did you consider
that after the initial pb the behaivor seems to be normal ? Regards Fred
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