[Hallicrafters] SR-2000 performance issues

[Laurance Brungardt]

Hi Jim,
 
Count me in on an SR-2000 interested parties list!... I was wondering if you came across any issues with the AGC / Meter Amplifier (V8 - 7059) circut on the Hurricane, mine has good receive but the s-meter is really soft, I wanna make that needle swing a little harder!
 
Thanks,
Red - W5UW


Jim Liles <james.liles at comcast.net> wrote:
Just want to pass along a heads up regarding radios that include an aluminum or other than steel chassis. We just finished restoring and de-bugging an SR-2000 finding two things that seem to be a problem on the SR-2000 and all of the radios that are built with a non-steel chassis. The use of the mounting ring for the tube socket for a ground is risky, even though they used a star washer between the ring and chassis. We found three rings with resistance readings to ground of from 3 to 10 ohms. This caused low level ripple on all circuits that used the ring for ground reference. In our case, the noise blanker performed poorly at best and was intermittently non-functional. We sprayed oxy on the washers and tapped them just enough to turn slightly and 0 ohms was the result with no ripple. The second problem was that the 20 meter band seemed to under perform the 15 and 10 meter bands. The SR-2000 and SR-400 use a 15 ohm resistor in series with the 56PF capacitor in the heterodyne
 oscillator output tank. We have found this resistor to be significantly high in all cases usually 25-30 ohms. The specs on that resistor should be ~<15ohms. We found 9 other manufacturing bugs that were simply sloppy workmanship. Is there an SR-2000 interested parties list anywhere? Regards Jim K9AXN
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