[Amps] Glass tube plate color

[Carl]

What happens when you swap positions?

Carl


----- Original Message ----- 
From: "Barrie Smith" <barrie at centric.net>
To: <amps at 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
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