[MRCG] Need BC-375-E advice

[mac]

On Jan 10, 2014, at 10:14 AM, Falls, Jim at DOC wrote:

> I didn't check the actual antenna contacts. Concentrated on the  
> keying contacts deep inside the main relay.

Antenna contacts got nothing to do with this problem.

>
> Running the filaments at 1/2 power right now with a variac ahead of  
> the PSU. Will bump them up to full power this afternoon. Not sure if  
> this is an Old Ham's Tale, but figured I'd give it a try rather than  
> slam these NOS tubes with full filament power after so long in  
> storage.

I've never done this and had no adverse effects, so far at least.   
Really large tubes like a 3-1000Z need filament inrush protection but  
only a few seconds worth.
>
> Feel a tad silly, but 211's that won't oscillate in this rig will  
> still work OK as amplifiers/modulators, correct?

Good question.  An oscillator tube requires some minimum sensitivity  
and amplification capability to work while an amplifier stage is more  
dependent on what's driving it.  When you do get the oscillator   
working again it would be interesting to go back to the old set of  
tubes and see if/how they perform as RF amplifiers and modulators.

Dennis, W7QHO

>
> 73 DE JIM K6FWT