[AMRadio] Lowest level modulation

Jim candela jcandela at prodigy.net
Wed Dec 22 21:22:23 EST 2004


    My recent EL-34 project runs linear AM with a single tube biased and
driven for AB2. With a resonant tank circuit on the plate you don't have to
run class A for single ended class linear amplifier. You are correct for
most audio circuits however.


-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net]On Behalf Of Edward B Richards
Sent: Wednesday, December 22, 2004 8:07 PM
To: amradio at mailman.qth.net
Subject: Re: [AMRadio] Lowest level modulation

I would not modulate the oscillator, Steve. You would probably get more
FM than AM. Low level means the early stages of a transmitter. You should
have a buffer stage between the osc and the mod to prevent pulling the
osc during modulation. All stages after the modulator have to be linear.
That means class A for a single tube or class AB or B for push-pull

73, Ed Richards K6UUZ

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