[Johnson] Valiant I crystal oscillator won't unkey

[Paul Carreiro, N6EV]

At 03:24 PM 12/16/2008, WA5VGO wrote:
> From the Johnson Service Bulletin:
>In some cases, very active crystals continue to oscillate under key 
>up conditions. Increasing the bias on V3 stops even the most active 
>crystals. Change R7 from 1 megohm to 500K 1/2 watt and R11 from 33K 
>to 100K 1/2 watt.
>
>I'm not sure why they would specify a non-standard value like 500K, 
>but I'm sure a 470K would work fine.
>
>73,
>Darrell, WA5VGO

Thanks Darrell.  Is that Service Bulletin available anywhere 
online?  I have Information Bulletin #1, but the above information 
does not show up there.  Wondering what other nuggets of information 
are contained therein.

I think I may have found the root cause of the problem.  I'm only 
getting -218 volts of bias on V11 where the schematic indicates 
-265.  I think I have a soft 6BY5 rectifier.  And as I remember it.. 
the last time I checked that tube it was questionable.  Heck of a 
time to have my tube checker out on loan.  Caps have already been 
replaced in the bias supply so short (excuse the pun) of a bad 
transformer winding, I think replacing the 6BY5 with a fresh tube 
will do the trick to increase the bias back up to where it should be 
(and hopefully cure the crystal oscillator problem).  I just ordered 
one.. we will see!

Thanks all
Paul  N6EV