https://www.febo.com/pipermail/time-nuts/2017-March/104374.html
The -2500 supply is nearly identical to the +3500 supply. We will post some photos on the disassembly process. We also had to disassemble the +3,500 supply because the 200 Meg resistor had gone up in value. It showed only 1,900 V with no load when it should have shown 3,200 V. We replaced the 47 uFd electrolytic with a tantalum as a preventive measure. After we repaired the -2,500 supply we measured the output voltage versus beam current as set by front panel adjustment. Note that about a 10% increase in electron multiplier voltage will double beam current. beam current High Voltage 30 -1,755 20 -1,658 10 -1,507 On our freshly repaired HP5061B, we ran it four hours with no voltage on the ion pump. It maintained lock when voltage was reapplied. Ion current and voltage were unchanged at 76 uA and 2500 V. You apparently can operate for some time with no ion pump. ======== Really good pix on the inside of the 3500V module. So the opening of the can is the typical lots of heat and pry it open approach right? How about a good pix of the 2500 Volt module? Thanks Paul WB8TSL _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
