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Re: [Amps] HV Diodes

To: Carl <>, Louis Parascondola <>
Subject: Re: [Amps] HV Diodes
From: Glen Zook via Amps <>
Reply-to: Glen Zook <>
Date: Fri, 17 Oct 2014 06:43:15 -0700
List-post: <">>
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 


On Friday, October 17, 2014 7:58 AM, Carl <> wrote:

A roller inductor is the last thing you want in a ham amp of desktop size 
Ulvin Tremendus in Spain has the dual 8877's already.


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 <>
To: Carl <>
Cc: Amplifier Mailing List <>; Manfred Mornhinweg 
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

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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