[Boatanchors] Millen Tx Question

[Don Buska]

Excellent explanation and research Glen!  With regards to the power 
supplies.  Millen never made one to supply power for the 90881 amplifier 
as strange as that might seem.  They had a power supply 90281 called the 
"High Voltage Supply", but alas it only provided the 700VDC (and 
filament AC) for the 90800 or 90801 transmitters.  Millen also had a low 
voltage supply designed for the B+ and bias voltages of the low level 
stages.

Further info on most Millen related items can be found at The James 
Millen Society website at:

http://www.isquare.com/millen/millen-page.htm

73

Don N9OO

Glen Zook wrote:
> According to the advertisement in the 1950 and 1955
> ARRL Amateur Radio Operator's Handbooks the 90881 used
> plug-in coils and 812 or 812A type tubes.  It was
> rated at 500 watts input.  The unit could be rewired
> to use several different types of final amplifier
> tubes.
>
> It was sold as the companion unit to the 90800 exciter
> which used a 6L6 (or 6V6) crystal oscillator into an
> 807 final amplifier or the 90801 exciter which used a
> 5763 and 6146 and was rated at 50 watts input.  The
> 90800 is listed in the 1950 Handbook and the 90801 was
> listed in the 1955 Handbook.  I had a 90800 exciter
> for years (sitting on a shelf) before I sold it on
> eBay several years ago.  Got a pretty good amount for
> it.
>
> Both the exciter and final amplifier units are listed
> in the 1959 Handbook but are not listed in the 1961
> Handbook (I do not have a 1960 edition).  There were a
> couple of power supplies sold that could power the
> exciter and final amplifier (neither had a power
> supply built in).
>
> I have no information on the modulator other than that
> it would have been used with the exciters since there
> is no where near enough power to use with the 90881.
>
> Glen, K9STH
>
>
>
> --- J Forster <jfor at QUIK.COM> wrote:
>
> Is anyone familiar with Millen transmitters?  In the
> estate of a SK I'm helping the widow to disperse,
> there is:
>  
> Millen RF Power Amplifier  90881  (no tubes)
> Millen 40 Watt Modulator   90831  (no tubes or knobs)
>  
> Do they go together? Also, any ideas of their values.
> Neither have tubes and are quite dusty, but otherwise
> appear complete and decent.  There is no PS with the
> transmitter.
>
>
>
>
>
>
>
>
>
> Glen, K9STH
>
> Website:  http://k9sth.com
>
>
>        
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