Gary Smith wrote:
> I personally miss the tube glow from the first amp I built. It had
> that beautiful 4PR1000A with 6KV on the plate.
>
Mine was a 6C21 with a passive grid. On the first tube I said "Hello
Test" and blew the plate right out of it. Of course they were only $5
each back then. Even with all those resistors on the grid I could barely
crack the mike gain on the HT-37.
Roger (K8RI)
> That glow was a thing of beauty.
>
> Gary
> KA1J
>
>
>> Every Commander amp that I have added QSK and vacuum relays to has had
>> the blue glow when looking through the cooling fins..
>>
>> The three holer on my desk, with brand new 3cpx800 tubes, glows blue.
>> The ten year old 3cx800 tubes also glow blue.
>>
>> The tubes are full output, and there is no issue. I believe the glow
>> which appears when cut off bias is removed, may be dependant upon the
>> trace elements in the ceramic, with different types of ceramic
>> producing somewhat different colors.
>>
>> Your amp is fine, you don't need to worry, just operate.
>>
>> 73,
>>
>> Mike
>> W2AJI
>>
>
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