[AMRadio] Difference and use of Eimac TH and TL tubes

david knepper collinsradio at comcast.net
Wed Nov 14 08:19:16 EST 2007

Carl, the problem is that many of these old bottles are gassy.

There are some techniques to rejuvinate them, like reduced plate voltage to 
burn off the gas.

Dave, W3ST - W3CRA
Collins Radio Association
Join the largest Collins group in the world
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----- Original Message ----- 
From: "jeremy-ca" <km1h at jeremy.mv.com>
To: <amradio at mailman.qth.net>
Sent: Tuesday, November 13, 2007 10:48 PM
Subject: [AMRadio] Difference and use of Eimac TH and TL tubes

> What is the current feeling about the use of those old Eimac jugs? 100T, 
> 250T, 304T, etc
> If memory serves me OK the high mu TH was mostly used as a RF tube and the 
> low mu TL as modulators. BC-610 excepted of course. What are the trade 
> offs between the 2 versions as modulators besides drive requirements?
> Carl
> KM1H
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