Make that bias voltages, from the specs it looks like the drive will be
similar in Class C
W2INR wrote:
The only differences will be drive and bias voltages. The performance
will be the same once dialed in.
G
Brett Gazdzinski wrote:
I don't think you will see any difference at all.
I used both as modulators, with the same results, and use 811 and 812
triodes in the push pull rig with the same results also.
Theoretically, the higher bias tubes work better in class C
but you cant hear or see any difference.
Brett
N2DTS
----- Original Message ----- From: "Barrie Smith" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" <[email protected]>
Sent: Saturday, February 23, 2008 1:41 PM
Subject: [AMRadio] TH vs TL
I'm curious as to the difference in RF performance between the TH (as
in 250TH) and the TL (as in 250TL) versions of older triode tubes.
Looking through the Eimac spec sheets for various old, glass triodes,
the only real difference appears to be that the TL versions require
higher grid bias in class C RF service.
I've used the TH versions of several of the older tubes a good number
of times over a many year period, but I've only used the TL types in
modulator service. However, if there is no real difference in RF
performance between the two in class C, I'm tempted to.
73, Barrie, W7ALW
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