[Johnson] Viking I 829B

[Carl]

The few 829B versions I worked on required the military socket which had the 
tube partially surrounded by metal.

The stock socket was poor even with parasitic suppressors at grid leads and 
100 Ohm carbon resistors bypassed on both sides at screen pins. Parasitics 
were much less but still possible at times.

Those same suppressor/resistor were used with the good socket and it was 
100% clean with 829B and 5894's. A 7854 could run 4D32 power levels.

Carl
KM1H



---- Original Message ----- 
From: "Alan Chandler" <alanchandler at frontier.com>
To: <johnson at mailman.qth.net>
Sent: Monday, March 04, 2013 12:57 PM
Subject: [Johnson] Viking I 829B


>I did the 829B mod a few decades ago and ended up going back to the 4D32
> because I could not stop the parasitic oscillation the wiped out TVs for
> several blocks.  Be sure to check if you plan to make this sub.
>
> Alan K6RFK
>
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