[Boatanchors] Millen 90651 GDO Problem

[WA5CAB at cs.com]

I can offer a hard copy reprint of either manual for $10 plus postage.  The 
manual title says 90561-A.  The schematic title says 90561-A-5.

In a message dated 01/01/2014 17:48:59 PM Central Standard Time, 
gzook at yahoo.com writes: 
> 
> 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 
>  

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480