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Problem with National NC-57
Hi -- I recently completed some repair work on a National NC-57. I
did the typical replacement of electrolytics, out of tolerance resistors, etc. It was functioning reasonably well beforehand but was in need of some TLC. Following my repair work, I turned the unit on and am only receiving a hum with no RX. I conducted some resistance measurements at all tube sockets and every measurement was nominal (according to my NC-57 manual) except for pin 6 of tube 7 (6V6GT). The manual indicates a resistance reading of 380K ohms and I'm receiving around 50K ohms (same as pin 3 and pin 4). To be honest, I can't see how pin 6 should be 380K ohms. The output transformer primary shunt resistor is 22K ohms and everything is wired correctly at the tube socket. I double checked my work and carefully reviewed the schematics -- everything looks good. I'm really stumped here... Any help would be greatly appreciated! Chris, N4JOY |
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