[JMS] FW: James Millen night and Project update

[Don Buska]

It might be nice to start a "gotcha" page for the website.  A basic list
for the differing Millen items.  On the 90801 transmitter the plate
tuning cap is mounted to the chassis and the front also has a locking
nut to help hold the front panel on.  If you tighten the front nut it
will crack the ceramic frame on the cap.  The chassis mount attaches to
the frame and stator plates.  The front panel is part of the rotor
plates.  When I got my 90801 the cap was damaged.  Lucky for me Ralph
over at JME had a couple of NOS caps left and I was able to replace it.
Now that front panel nut is only finger tight.  I always felt that was a
real non-Millen design flaw!

Note this cap was designed just for the 90801.  You could always find
another with a similar form factor, but you won't find one with the
exact capacitance value.  Thus a non-original replacement would result
in skewed indication on the front panel band markings.

73

Don N9OO 

-----Original Message-----
From: james_millen_society-bounces at mailman.qth.net
[mailto:james_millen_society-bounces at mailman.qth.net] On Behalf Of
Dennis & Pat Petrich
Sent: Wednesday, April 05, 2006 7:09 PM
To: 'The James Millen Society Members Email Reflector'
Subject: RE: [JMS] FW: James Millen night and Project update

Hello Clive,

Thanks for the tip on the HV on the plate tuning cap but I found out the
hard way....  Got a good bite....  Good thing I only had 500v on the
plates.

Look forward to hearing your 90800 on the air.

73's Dennis, k0eoo

-----Original Message-----
From: james_millen_society-bounces at mailman.qth.net
[mailto:james_millen_society-bounces at mailman.qth.net] On Behalf Of Clive
Oakes
Sent: Wednesday, April 05, 2006 4:08 PM
To: The James Millen Society Members Email Reflector
Subject: Re: [JMS] FW: James Millen night and Project update

Hi Guys

Millen Net is great idea. I am working on a power supply and modulator
for my 90800 I picked up in Rochester last September. Am building my own
modulator using an 829B in class AB1 which operates at 600 volts, ie the
same voltage as the plate modulated 807. This means I can use the same
choke input power supply for both the 90800 and the modulator.

Caution: Don't let the Knob come the Plate Tuning Capacitor of the 90800
as the shaft is at 750 volts!

Clive   VE3YB:

>-------------- Forwarded Message: --------------
>From: myann88 at comcast.net
>To: james_millen_society-bounces at mailman.qth.net
>Subject: James Millen night and Project update
>Date: Wed, 05 Apr 2006 21:30:44 +0000
>
>Greetings all!
>
>A James Millen night would be great. Count me in!  Latest on my Millen
project:
>I gave the rig (Millen 812A amplifier, Millen exciter, Millen 2" scope,
homebrew LV and HV supplies and 811A Modulator) an RF smoke test.
Everything works smooth as glass.  I plan to add the modulator and audio
driver on line within the next week  or two after doing some mods on the
EICO 730 Speech Amp.  
>
>Again, a James Millen night or whatever certainly has my attention!
>
>Vy 73,
>Mike Ruggiero, W2NVR
>______________________________________________________________
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>Home: http://mailman.qth.net/mailman/listinfo/james_millen_society
>Help: http://mailman.qth.net/faq.htm
>Post: mailto:James_Millen_Society at mailman.qth.net
>  
>


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