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Subject: Re: [AMPS] Dentron L Tuned Input

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Subject: Subject: Re: [AMPS] Dentron L Tuned Input
From: (Jim Zellmer)
Date: Fri, 7 Jul 2000 21:30:42 -0500
To: <>
Date: Thu, 6 Jul 2000 16:56:09 -0500
From: "Phil Clements" <>
Subject: Re: [AMPS] Dentron L Tuned Input

Subject: [AMPS] Dentron L Tuned Input

> Looking for information on the Tuned Input on the Dentron L tuned input.
> OR
> Schematic for the tuned input and/or a schematic for building a tuned

My memory may be faulty, but I seem to remember someone on the Amp list
mentioning that a transformer could be used to help the input impediences of
a ML-2500.  I seem to remember that the tubes were looking for about 200
ohms on the input.

I was clipping articles out of a bunch of old CQ magazines and came across a
unbalanced to unbalanced 4 to 1 transformer that consisted of 10 double
turns of  #18 gauge Formvar wire wound on a Palomar Engineering powered iron
core (T-80).  The torroid core had an OD of .8 inch and ID of .3 inch.

 This transformer might be useable for your application.  I am going to try
one in my MLA-2500 along with a pad.

The article was from the December 85 issue of CQ magazine starting on page
13.  Title:  "The Silver City Kilowatt" by Dean Battishill and Lew McCoy.


Jim Zellmer, KA0VSL

> Running a Yaesu FT-847 into the Dentron L with a manual tuner between the
> and the amp which is really a pain.
> Thanks
> Mike

Dentron made a "black box" tuned input for their amps. It has a switch on
front of it for 160-10m. These are still floating just sold on
three days ago. Henry Radio will sell you a tuned input completely assembled
and aligned. All you need is a box or build it into an amp.

If you are a builder, look at any ARRL Handbook for details and projects.

Phil, K5PC

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