[Boatanchors] Millen 90651 GDO Problem

[Glen Zook]

The original 90651 grid dip meter doesn't have a sensitivity control.  The manual for this GDO can be found at:

https://www.google.com/#q=millen+90651+grid-dip+meter+manual


The 90651A does have a sensitivity control and uses a 2N406 transistor.

I cannot find, on the Internet, a manual for the 90651A.  However, I do have an original manual and can scan the schematic and E-Mail it if requested.  Frankly, the schematic in the manual is pretty crudely drawn when compared to the schematics in most original manuals.
 
Glen, K9STH


Website:  http://k9sth.com



On Wednesday, January 1, 2014 2:46 PM, Bill Stewart <cwopr at embarqmail.com> wrote:
 
Hi Ray,
The model nr. is 90651, as mentioned in the subj. line...hi.
This GDO has the fil. and plate switches, sensi. pot and a sel. rectifier.
Don't see any transistors. There is a parts list in the BAMA info.
Tnx, Bill K4JYS 

----- Original Message -----
From: "W4BYG Ray" <w4byg at att.net>
To: "Bill Stewart" <cwopr at embarqmail.com>, "boatanchors" <boatanchors at mailman.qth.net>
Sent: Wednesday, January 1, 2014 1:41:28 PM
Subject: RE: [Boatanchors] Millen 90651 GDO Problem

Bill,
You didn't mention the model number of your Millen GDO.  

The 90651 schematic does not show the pot you mention.  The 90651-a-5 and
90662-a each have a 15K pot labeled as a sensitivity adjustment.  The pot
drives the base into the SS meter amplifier.  the transistor could be bad.

I do not have any other suggestion as to your problem.  I have a fairly poor
schematic of both models.  They may scan good enough to help you.  I am not
aware of any parts lists being supplied with them.

What model do you have?
73,

Ray, W4BYG

-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Bill Stewart
Sent: Wednesday, January 01, 2014 1:24 PM
To: boatanchors
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 
 
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