[R-390] Autotuners

[Walter Wilson]

Ken,

The 12BH7 mod jumpers pins 2&4 and 5&7 underneath the 3TF7 tube socket.  
It works very well if your ballast tube dies.  I can't tell any 
difference.  Just check continuity between these pins from the top with 
the tube pulled to see if you have it installed.

See http://r-390a.us/R-390A_Modifications.htm for this and other 
modifications.

Walter - KK4DF
http://www.r-390a.us

Kenneth Arthur Crips wrote:

>I have the RF/IF module out of my R390A checking to see why the BFO is failing and I was wondering I have the 12BH7A mod' in place for the 3TF7
>and have read on this forum about jumpering the socket and installing 12AB7's in place of the 6AB7's in the BFO and PTO positions.  Is this a better setup then what I have now?
>
>                                                                      Ken
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>Kenneth, Radio Station W7ITC, with Beezie, Chic' Cowboy, 
>Members of the Irish Terrier clan known as the Chew Crew.
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