[AMRadio] Re: AM Transmitter Advice??


W1EOF w1eof at hamnutz.com
Thu Feb 16 21:48:14 EST 2006


Hey Bob -

I really enjoyed reading the article about your 6AX5 transmitter in this
months Collector. Very cool stuff and what I like most
about it is you did for pure enjoyment. Kudos.

73,

Mark W1EOF


> -----Original Message-----
> From: Bob Deuel [mailto:k2glo at jkasystems.com]
> Sent: Thursday, February 16, 2006 7:05 PM
> To: 'Discussion of AM Radio'
> Subject: [AMRadio] Re: AM Transmitter Advice??
>
>
> Hello Larry and all:
>
> Larry's tongue in cheek comment employing 866's as a linear amplifier tube
> prompted me to contribute the following: Certain full-wave
> rectifiers can be
> configured to amplify or oscillate. I have built audio, Hartley
> and Simpson
> oscillators using only 6AX5GT's full-wave rectifiers as the sole active
> device. These were displayed at 2004 Mid-Atlantic Antique Radio Club Meet
> and actually won a Blue Ribbon.
> Late last year I built an AM transmitter consisting of a Hartley
> oscillator
> modulated by an AM modulator using only 6AX5GT full-wave
> rectifier tubes as
> the active devices. No solid-state magic, just simple full-wave
> rectifiers.
> The basic concept is that of the Heintz and Kaufman gridless Gammatron
> circuits. The transmitter was set up for the broadcast band and
> works fine.
> It has been publicly demonstrated a couple times now and a write up
> including the circuit was published in the February, 2006 issue
> of the "Tube
> Collector" magazine which is the bi-monthly magazine published by the Tube
> Collectors Association, Inc. It is fun to make full-wave
> rectifiers do more
> than just rectify.
>
> Bob, K2GLO
>
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of ne1s
> Sent: Thursday, February 16, 2006 10:36 AM
> To: Discussion of AM Radio
> Subject: [AMRadio] Re: AM Transmitter Advice??
>
> Donald Chester writes:
>
> >
> >> Assuming one is going to build a linear, and so putting aside other
> >> issues
> >> such as linear vs plate modulation, why do you think it makes a
> >> difference
> >> what tube is used? Are you referring to running a linear at
> greater than
> >> legal limit?.
> >
> > Well, go ahead and try building a legal limit linear that runs
> a pair of
> > 807's in the final.
> >
>
> Yeah, or a pair of 866As....
>
> Sorry (the devil made me do it).
>
> 73,
>  -Larry/NE1S
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