[AMRadio] Building

jeremy-ca km1h at jeremy.mv.com
Sat Dec 1 21:45:33 EST 2007

----- Original Message ----- 
From: "Brett Gazdzinski" <brett.gazdzinski at verizon.net>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Saturday, December 01, 2007 9:26 PM
Subject: Re: [AMRadio] Building

>I have a push pull paralell 100TH mod deck, and its the worst
> sounding mod deck I ever built.
> You need a lot of driving power, and into an unstable load.
> Now I have run rigs with a pair of 100TH tubes as modulators, and it
> sounded fine.
> I have tried various voltages, mod transformers, resting currents,
> and so on, but the push pull paralell never sounds real clean.
> Its not foul, just not clean compaired to other mod decks on the same
> transmitter.
> Brett

I would think that a low gain 100TL with feedback would be a better choice. 
A little more drive required but less variation under a changing load. 
Similar to the requirements of industrial tubes with varying loads.


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