[Boatanchors] Millen 90651 GDO Problem

[Richard Knoppow]

----- Original Message ----- 
From: "Bill Stewart" <cwopr at embarqmail.com>
To: "boatanchors" <boatanchors at mailman.qth.net>
Sent: Wednesday, January 01, 2014 10:24 AM
Subject: [Boatanchors] Millen 90651 GDO Problem


>
> Hi all and a Happy New Year,
> I tried to use my Millen GDO a few days ago and the meter 
> slams hard
> to the left. The 9002 cks w/o any shorts, but is abt half 
> the reading it should
> be on a Hickok tube tester...don't have a spare to try. 
> This GDO has a pot
> on the left side with a nice chrome knob. It varies the 
> meter reading. The pot
> does not show up on the BAMA schematic & looks to be 
> factory installed.
> The s/n is 265.
>
> First, any ideas what the pblm might be and secondly, 
> would anyone have
> a schematic & parts list of this model that shows the pot 
> and could send me a scan.
>
> Tnx, 73 de Bill K4JYS

     Check the site at: 
http://www.isquare.com/millen/millen-page.htm   for 
schematics and photos of the various models.  There do not 
appear to be any with a sensitivity adjustment on the side, 
one has it on the front.  I suspect your meter may have been 
modified by someone.
     The usual symptom of a weak tube is failure to 
oscillate on the highest band or on parts of the lower 
bands.
     Has this meter been working correctly in the past?  If 
so its possible the tube has gone gassy or one or the by 
pass cap has shorted.  I think you are going to have to 
trace around and see how the modification was done. That may 
give you a clue as to what has happened.  Before going 
bananas try cleaning the tube pins and socket connections.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com