[Johnson] Viking 1 tuning

[Gary Schafer]

See if you still have the crystal oscillating. It could be that you lost
crystal drive and the stage(s) are oscillating on their own. Listen on a
receiver to the signal.

73
Gary  K4FMX


> -----Original Message-----
> From: johnson-bounces at mailman.qth.net [mailto:johnson-
> bounces at mailman.qth.net] On Behalf Of John King
> Sent: Sunday, October 21, 2012 7:20 PM
> To: johnson at mailman.qth.net
> Subject: [Johnson] Viking 1 tuning
> 
> I am having real trouble getting the exciter stages of my Viking 1 to
> tune as they should they were tuning up and providing drive to the
> final, but then the exciter stage stopped tuning as it should in the
> OSC, Buffer,Drive and Grid readings.
> I have replaced the 6AU6, and 6AQ5 tubes with no improved results. I
> also changed the 6AL5 bias rectifier.
> 
> I am extremely frustrated by the malfunctioning exciter section. I have
> four other transmitters on the bench awaiting parts and finishing the
> Viking 1.
> 
> I had the Viking pumping out slightly over 100 watts and then the
> problem popped up. I replaced the audio driver transformer.
> 
> My conclusion is that the exciter stages in the Viking 1 are just very
> unstable and the instructions in the manual don't help me very much. Has
> anyone had a lot of first hand experience with the Viking 1 tuning and
> experienced the on again off again functioning of those stages. If so, I
> will greatly appreciate your assistance. The only tuning control that
> shows changes in tuning is the drive control. The oscillator and buffer
> controls make no difference in tuning. The Viking 1 is a simple
> transmitter but it is frustrating me. Thanks and 73, John, K5PGW
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