[Boatanchors] Millen 90651 GDO Problem

[Bill Stewart]

Hi Glen, 
Tnx for the offer. The 90651 manuals, so far, have been the same as found on BAMA. 
I am beginning to think that the pot may have been added by a user. I will ck 
out the pot wiring later. Thanks for your help...73 Bill K4JYS 


----- Original Message -----

From: "Glen Zook" <gzook at yahoo.com> 
To: "Bill Stewart" <cwopr at embarqmail.com>, "W4BYG Ray" <w4byg at att.net> 
Cc: "boatanchors" <boatanchors at mailman.qth.net> 
Sent: Wednesday, January 1, 2014 6:48:52 PM 
Subject: Re: [Boatanchors] Millen 90651 GDO Problem 



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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