[Johnson] re: Viking II better than Heathkit DX 100

[Glen Zook]

Actually, I should have said that the DX-100 uses
12BY7 tubes in both the multiplier and driver stages
where the Viking II uses a 6AU6 in the multiplier
stage AND a 6AQ5 in the driver stage.

The 6AU6 definitely does not have enough power to
drive a pair of 6146 tubes.  The driver in the Viking
II IS a 6AQ5.  The last Viking II that I worked on had
the 6AU6 modified to use a 6AQ5, but the original
transmitter definitely had a 6AU6 in the first stage
as the crystal oscillator / VFO buffer.

I have found that not all 6AQ5 tubes work well at 28
MHz, especially since they were designed as an audio
output tube.

Glen, K9STH

--- Dale Smith <newday at metrocast.net> wrote:

and the multiplier and driver tubes were 12BY7 types
which, in general, work better than the 6AQ5 tubes
that Johnson used for the same stages in the Viking
II.
 
I think you mean 6AU6 Tubes.

Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco

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