[Hallicrafters] SR-2000 HIGH VOLTAGE TICK AND MORE

[Jim Liles]

A while back we started chasing an intermittent high voltage tick in the SR-2000 that occurs at about 1/2 second in low power mode and about every 1/4 second when high power is enabled.  The culprit was the plate/screen plug that connects to the SR-2000.  Disassembled and cleaned it and voila it is history.  Tried it on another with the same result.  Another issue with the P-2000 is the tendency to replace the high voltage capacitors with much higher values of capacity --- more is better.  Not so.  The manual calls for 90uf capacitors which are difficult to find but 100's or 50/50's are common and can be used.  Anything higher can cause damage to the tubes if a flashover should occur.  The 8122 specs call for no more than 10uf in the plate filter for that reason.  Lastly, if you are restoring a P-2000 check that the overload relay trips out at 120 to 140ma isolated or 850 to 980ma with the 4 ohm resistor across it --- might save tubes one day.  We have found a few with open coils that simply couldn't trip, fall back goes to the main fuses which is usually to late.    

Don't let em smoke!
Kindest regards Jim K9AXN