[Johnson] Viking500 Audio Mod

[Dennis Petrich]

I was just at the CES show this last weekend and noticed that new 6B4's are
available now for those audio phools.  Not sure who the mfg is but they sure
look nice.

Dennis, k0eoo

-----Original Message-----
From: johnson-bounces at mailman.qth.net
[mailto:johnson-bounces at mailman.qth.net] On Behalf Of Ed Wirtz
Sent: Friday, January 15, 2010 10:32 PM
To: Johnson
Subject: [Johnson] Viking500 Audio Mod

hi guys,

This may be old hat to many of you but I have come up with a simple 
wiring change to the 6B4 modulator driver amplifier.socket that will 
allow use of either a 6A5G or a 6B4. In the service we are using these 
tubes they are identical in performance. I know that the 6A5G and 6B4 
are both expensive because the audio phools are grabbing them up but 
some of them don't seem to know about the 6A5. I have made this mod to 
two 500s including my own and they both work great with either tube as 
the audio driver.

If you feel this is of value I can write up the mod and post it here.

Thanks and keep those Vikings perking.


73,

Ed, KØBKA

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