Carl and all:
Thanks for the responses.
I did swap the tubes, as Carl suggested. The brightest glow stayed on the
right.
So, I suppose I have some sort of circuit imbalance.
Since the visual imbalance is only slight I wonder what to do about it, if
anything?
73, Barrie, W7ALW
----- Original Message -----
From: "Carl" <km1h@jeremy.mv.com>
To: "Barrie Smith" <barrie@centric.net>; <amps@contesting.com>
Sent: Sunday, August 15, 2010 10:45 AM
Subject: Re: [Amps] Glass tube plate color
> What happens when you swap positions?
>
> Carl
>
>
> ----- Original Message -----
> From: "Barrie Smith" <barrie@centric.net>
> To: <amps@contesting.com>
> Sent: Sunday, August 15, 2010 11:55 AM
> Subject: [Amps] Glass tube plate color
>
>
>> Speaking of class C, I have just completed a nostalgia rig using a
>> push-pull pair of VT-127As (somewhat similar to the 100TL, but looks like
>> a spaceman with grid and plate pins sticking out the sides).
>>
>> I've been bench-testing it the last few days with a wimpy power supply.
>> Surprisingly, I'm up to 500 wattts out with 1300 volts on the plates.
>>
>> I have several tubes, and have tried a couple of different pairs. In
>> both instances I've noticed that one tube will have a slightly brighter
>> plate glow than the other.
>>
>> I'd like to have the tubes as closely matched as possible.
>>
>> My question is: Which tube is most likely to be the better, the bright
>> one, or the cooler one?
>>
>> 73,
>> Barrie, W7ALW, DN36au,
>> QRV 6M, 432 & 1296 EME
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
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