[R-390] bfo problems

[DAVEINBHAM@aol.com]

Back when I was in the Air Force 40+ years ago, they taught us that if the 
tube tester says it's bad, the tube is bad. But if the tube tester says it's 
a good tube, it ain't necessarily so.
The " best" way to test a tubes is to temporarily replace it with 
" a known good tube."

Regards,
Dave


In a message dated 1/2/2003 11:05:29 PM Central Standard Time, 
keng@moscow.com writes:


> Substitue the HF oscillator tube and/or any heterodyne/conversion 
> oscillator tube. I have an HQ-110-C which did the same thing. 
> BOTH the HF (tunable) oscillator tube and the 2nd conversion 
> (crystal) oscillator tubes had high cathode to filament leakage. My 
> TV-2 said they were both all right. Cured it by substituting new 
> tubes. Afterwards, I found a service bulletin from Hammarlund that 
> explained the problem, which was apparently not uncommon.
> 
> Ken Gordon W7EKB
> 



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