[R-390] RE: More Tube Shields/Temperature

[Drew Papanek]

Bill Hawkins wrote:

>Try an adjustable line voltage and see where the set begins to lose
>sensitivity. Could we get a report from those who use a Variac to
>gently start their radios?

I run the R-390A at the far end of a long circuit and with a space heater 
also occasionally on that  circuit  I measure 100v .   Not really a variac 
per se, just a heavily bled series resistance , I guess.

Under the aforementioned conditions I measure 4.6v  on the 6.3v (nominal) 
tube heater bus.
Voltage that low could cause tube cathode deterioration.

Per my unscientific evaluation technique, sensitivity does not seem to be 
affected, but maximum audio  output level is significantly reduced.

Drew

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