[R-390] 3TF7 Failed in service

[Tom M.]

You can use 12V (12BA6) tubes for the BFO and PTO tubes, and short the dead
ballast tubes.

Works like a charm.

Tom 
--- G4GJL@aol.com wrote:
> Contrary to observations made from time to time by others on the reflector, I
> 
> have had a 3TF7 Ballast fail  WHILST POWERED UP.
> 
> The 390A here was powered up, but muted with the break-in facility for a 
> period of 4 hours, during which the ballast failed. 
> 
> I dont have a spare, and have just undergone abdominal surgery, so I dont 
> feel like lifting the rig or working on the rig to make a solid state 
> replacement. 
> 
> Instead, I made a makeshift repair with a 33ohm and a 10ohm resistor in 
> series, jammed into the tube socket on the appropriate pins. 
> 
> Dont flame me...it works!
> 
> Ill do better when I am!
> 
> 
> 73
> 
> Pete
> 
> G4GJL
> 
> 
> 
> 
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