[AMRadio] Re: looking for linear amplifier

[David Knepper]

Hi - Don

I have plenty of the original tubes which are all Western Electric.  The box
of new tubes are worth more than the transmitter!

I was told that it was Doherty.  How could I tell?

Thanks
Dave, W3ST
Secretary to the Collins Radio Association
Publisher of the Collins Journal
www.collinsra.com
----- Original Message -----
From: "Donald Chester" <k4kyv at hotmail.com>
To: <amradio at mailman.qth.net>
Sent: Sunday, December 21, 2003 2:06 PM
Subject: Re: [AMRadio] Re: looking for linear amplifier


>
>
>
> >From: "David Knepper" <cra at floodcity.net>
>
> >Jim, for your information, I have a Western Electric 451A-1 transmitter
> >(250
> >watt class) that uses Doherty circuitry.  It has 6 tubes in the final
that
> >are similar to 211 type tubes.
> >
>
> Dave, are you sure it uses the Doherty circuit?  I recall working a couple
> of guys on 160 each using one of those rigs, and they told me it was
> straight control grid modulation.  If you run short of 211's, the rig will
> run at reduced power by leaving some of the sockets empty.  The problem
with
> that transmitter is that the audiophools have scarfed up all the surplus
> 211's and tubes for the final are now expensive and hard to find.
>
> Don k4kyv
>
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