I have had a Henry/Tempo 2001 linear amplifier, that uses a pair of 8874 tubes,
which has a roller inductor, for almost 40-years. No problems!
The "plate tuning" in this amplifier is actually uses the roller inductor. The
plate tuning capacitors are fixed and the roller inductor is tuned. Of course,
the antenna loading is a variable capacitor.
I do not believe that there were that many 2001 amplifiers sold. I have
actually had another one in my hands but don't know of anyone else who has one
of these.
The roller inductor makes tuning on the WARC bands easy even though the
amplifier was designed before those bands were established.
Glen, K9STH
Website: http://k9sth.net
On Friday, October 17, 2014 7:58 AM, Carl <km1h@jeremy.qozzy.com> wrote:
A roller inductor is the last thing you want in a ham amp of desktop size
anway.
Ulvin Tremendus in Spain has the dual 8877's already.
Carl
KM1H
we have been waiting on that dual 8877 amp with roller inductor for some
time now. Many die hard hams would prefer that over solid state.
-----Original Message-----
From: Dan Simmonds <info@dedicatedrf.com>
To: Carl <km1h@jeremy.qozzy.com>
Cc: Amplifier Mailing List <amps@contesting.com>; Manfred Mornhinweg
<manfred@ludens.cl>
Sent: Thu, Oct 16, 2014 8:38 pm
Subject: Re: [Amps] HV Diodes
Perhaps, yes. But regardless of how inexpensive the Chinese amps may be,
at the end of the day they will still be Chinese amps, metaphorically
speaking.
Exciting things to come in 2015 in the QRO solid state market. Trust me
on this :)
Dan KK3AN
>
>
> The Chinese have some serious amps but no US certification yet that Im
> aware of. Once they get going watch out! They are already taking over
> the tube business.
>
> Carl
> KM1H
>
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