[AMRadio] WTB: Millen 90801 Exciter


WD5JWY wd5jwy at tekwav.com
Mon Jan 3 20:04:28 EST 2005


Yes, I did finally figure that out last night.  It's truly a classic design.
That's why I would like to duplicate it - but in a form factor as physically
close to the Millen 90801 as possible.  I love the heavy metal rack-mount
gear.

Thanks,
73
de, WD5JWY
Dennis Pharr
Oklahoma City
 


-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Alan Cohen
Sent: Monday, January 03, 2005 4:17 AM
To: Discussion of AM Radio
Subject: Re: [AMRadio] WTB: Millen 90801 Exciter


Actually, I believe that the circuit for the Millen 90801 exciter is, 
in fact, in the December, 1952 issue of QST.  The reason that you 
didn't find it, is because the the circuit is used in a complete novice 
transmitter project by George Grammer called, "75 Watts with an Economy 
Power Supply."  This transmitter is one of the earliest applications of 
the then brand new RCA 6146 to appear in QST.  It features plug-in 
coils with a link coupled output and inductive neutralization.  In the 
Millen exciter they use a band switching arrangement but the circuit is 
electrically the same.  Perhaps someone else on the list can confirm 
that.

About five years ago I was fortunate enough to acquire a very well 
executed version of the transmitter described in the QST article.  I 
built a web page describing it here: 
http://home.comcast.net/~acohen788/

Interestingly, I have since added a couple of other George Grammer 
designs to my collection.  When I have the time I'll snap some pictures 
and add them to the page.

Alan
WA2DZL




On Jan 2, 2005, at 7:36 PM, WD5JWY wrote:

> Gentlemen:
>
> I'm looking for a Millen 90801 HF Exciter in reasonable condition.  I
> would
> prefer one that is in operating condition, however I would consider 
> offers
> on units in any shape.
>
> Also, if anyone has detailed technical drawings or high-quality 
> digital photos of the 90801, I would appreciate the information.  
> Since these units are so rare, I'm thinking of attempting to duplicate 
> the unit as closely as
> possible, but I would need the above technical data to do so.  This 
> unit was
> supposedly described in the December 1952 issue of QST, however I 
> cannot
> find it in that issue.
>
> I'm also interested in the following units as well:
>
> Millen 90831 40W Modulator
> Millen 90281 HV Power Supply
>
> 73
>
> de, WD5JWY
> Dennis Pharr
> Oklahoma City
>
>
>
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