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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