[Hallicrafters] SR-2000 S-Meter insensitivity correction #2 to past article

[Duane Fischer, W8DBF]

Thank you Jim. I 'heard' you on the HHI Net this afternoon, almost! So much 
Sweepstake QRM that reception was nearly impossible of stations 5/9+10 or 
greater.

For others reading this: PLEASE cut and paste this information into Word 
Pad, (or whatever you use), give it an intelligible file name and save it to 
your "Boat Anchor Tech" directory, AKA 'folder'. Additionally, print it out 
in hard copy and then file said paper, or papers, in a 9X11.5 envelope, or 
whatever size they are, label what is inside on the front of said envelope 
and then put it inside your Hallicrafters folder. Then next time you need to 
know, you will be able to know as soon as you find the folder it is in!

Simply put guys: print valuable information like this out and save it. It is 
worth your time and effort.


----- Original Message ----- 
From: "Jim Liles" <james.liles at comcast.net>
To: <hallicrafters at mailman.qth.net>
Sent: Sunday, November 16, 2008 7:29 PM
Subject: [Hallicrafters] SR-2000 S-Meter insensitivity correction #2 to past 
article


> I'll get this thing right yet!
>
> Good morning to all!
>
>
>
> We have received numerous inquiries regarding SR-2000 S-Meter 
> insensitivity.
> First, the procedure for adjusting the S-Meter included in the operator's
> manual is a bit lacking.  The correct procedure is to turn the AGC 
> threshold
> pot, R-46 fully clockwise, zero the meter with the meter zero pot, and 
> then
> turn the AGC threshold pot CCW until the meter just moves.  This is a 
> three
> step process and you are finished.
>
>
>
> Before doing anything, check the resistors R-118, 119, and 121.  They are
> critical, especially R-118.  You can find R119 the 82K resistor directly
> below L15, R121 3.3K under the plate that holds the Meter zero pot, and 
> R118
> 5.6K at V8B.  Disconnect one S-Meter lead and measure all three after
> unscrewing the pot plate and isolating it from ground, you won't have to
> unsolder anything.
>
>
>
> Bear in mind that the AGC/S-Meter tube is a 7059 which is a 13.5V tube
> running at 12.6V if all is well and 90V on the plate.  After you perform 
> the
> adjustment above, remove the S-Meter tube V8A and see what the S-meter
> indicates.  It should be above +60Db, pegged.  Whatever it reads with the
> tube removed is the highest reading possible.  You will probably wonder 
> why
> the meter is pegged when you first turn it on.  When first fired up, the 
> B+
> will be approximately 320V until the tubes warm up and draw plate current.
> Then it will drop back to 280V (The meter is driven with a bridge).  Tube 
> V8
> is the one tube in the SR-2000 that must be hand selected for S-Meter
> performance.  If the meter does not peg with V8 removed replace it and do
> the above adjustment then pull the tube and repeat until its right.
>
> The S-Meter will be quite accurate when you are finished.
>
>
>
> Kindest regards Jim K9AXN
>
> ______________________________________________________________
>
>
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