[Hallicrafters] Cyclone SR-400 questions

[james.liles]

Hi Andrew:
For the S-Meter, replace V8, the AGC amp tube is most likely the problem. 
If that doesn't fix it, check the three resistors in the bridge on V8.  FYI, 
the 82K 1W resistor MUST BE 82K +0% -10% or the S-Meter adjustments will be 
impossible.  All three bridge resistors should be changed out to metal film 
resistors --- they need to be close and dependable.  After you get it right 
let me know and I'll forward to the reflector, an upgrade for the S-Meter 
circuit that will improve it's accuracy and make it a useable indicator.

For the serial # --- can't tell on the SR-400, however if you forward a 
clear close-up of the under chassis I can identify the level.  For some 
reason the serial # on the SR-400 doesn't tell all as the SR-2000 # does.

Good luck and Kindest regards Jim K9AXN

Original message:

> Message: 1
> Date: Sun, 13 Jun 2010 18:32:47 +1000
> From: "VK2ACC" <vk2acc at exemail.com.au>
> Subject: [Hallicrafters] Cyclone SR400 questions follow-up
> To: <hallicrafters at mailman.qth.net>
> Message-ID: <E1A1C3626E3744DB9CFA46F85F52C0A9 at library>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Thanks to Walt WD0GOF, Sandy AC1Y, Jack W1JHS and James Liles for 
> responding to my queries.
>
> In response to James,
>
> 1. When I wind up the AGC pot, the meter pegs left and the meter zero 
> adjustment can't bring it back up (RF gain full CCW or CW) - so I guess I 
> have a problem.
>
> and some new questions:
>
> 2. The serial numbers are:
> SR400 : 4400xxx  815023 and the chassis is stamped 199813C - xxx requires 
> forensics
> PS500A : 750010 746046
>
> Any clues where these fit into the revision levels ?
>
> 3. I noticed that the solder joints in my PS500A on the WW resistors R201 
> & R202 looked a bit "cooked" so I tried reapplying solder.
> But my soldering iron has no effect ! Was a special solder used or are the 
> joints just cooked ? P.S. I have 20K rather than 15K resistors.
>
> Cheers
> Andrew
> VK2ACC
******