[Hallicrafters] SR-2000 performance issues

[Jim Liles]

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