[Milsurplus] FW: BC-639 Receiver

[Hubert Miller]

-----Original Message-----
From: nwvrs 
On Behalf Of Marc Lacy
Sent: Tuesday, June 20, 2023 9:13 AM

>Interesting about the BC639. I had worked on those early in my USAF days, and we all knew that the voltage selection dial on the power supply on those Bendix machines were backwards, and that the receiver worked fine with lower B+
Also, Civilian Aviation VHF radio is STILL AM, even though all others seem to have been changed to narrow band FM.
Troutedale airport tower is sometimes very busy.
Marc

On 6/19/2023 9:11 PM, Hubert Miller wrote:
>High voltage is also an enemy of electronic parts. ( I recall a friend had 
> a BC-639 VHF receiver that he tuned to Seattle aviation frequencies. 
> He had it powered from an outboard, adjustable B+ supply. When he 
> turned the voltage up to the spec 250 volts, the receiver smoked - - 
> bad sign ! When he cranked the > B+ down about 50 volts lower, it played
> fine, no smoke ! Very odd !  > B+ Which reminds me of the old
> radio alignment joke: "Adjust for minimum smoke" ) 
> -Hue Miller

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