[AMRadio] RE: the weekly receiver update

[wwd at netheaven.com]

>R-392 supposed to  run  on 28vdc.  I  have a  24v power source that 
>works  fine.

>>
>> >The whole receiver seems to work fine at 75 volts!
>>
>>The Collins R-392 works fine at 26vdc with 'normal-looking' tubes perhaps
>>somewhat modified to operate at such plate voltage. If you don't need
>>power you really don't necessarily need the voltage either.

According to whom? And what is the significance of your observation?

Mine was that there exist normal-sized tubes that can operate at 1/3 the
75 volt level he observed. Not exactly sure just why that is possible
since element spacing does not appear to be reduced on these ~28 volt
wonders. I mean they are not subminiatures or nuvistors, but regular
looking 7-pin tubes.

Also, it is the T-195 that feels voltage-deprived at ~24 volts. The R-392
really doesn't care what you give it over the range 24 - 28vdc.

Bill K2AME
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wwd at netheaven.com  To the warriors go the spoils of war; to the hindmost .  .  the surplus.
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