If you have one tube like aan 833A running slightly cherry and the other is
not showing any color, then, the latter is a weak tube. The former has low
emission, in other words.
Dave, W3ST
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----- Original Message -----
From: "Geoff/W5OMR" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
<[email protected]>
Sent: Monday, December 11, 2006 11:23 AM
Subject: Re: [AMRadio] Screen Modulated 813
Jack Schmidling wrote:
Jim Wilhite wrote:
A bit of cherry red is ok. Just remember what KYV said, don't exceed
the plate dissipation of the tubes.
Roger but isn't color a function of plate dissipation?
In other words, can one use shades of red as real world indication
instead of relying on theoretical calculations?
in short, no.
some tubes 'color-up' at different levels than others.
K5SWK had a pair of 833's in his modulator.. one always showed more color
than the other.
Seems I remember a time when there were a pair, and one did -not- show
color at all, while the other one did. He thought it wasn't working, but
it was proven that it indeed was.
John/BXO has 4 813's in push-pull parallel in his modulator.. at normal
voltage, there's one that always showed 'a little color' when at idle.
No, you can't depend on the color of the tube, to determine output of said
tube.
--
73, etc
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