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Cardmatic update & ?
I've got one of my Hickok LS 15874 L2 Cardmatics going. I cleaned, lubed
and realigned the switch matrix as well as other switches and also found a cold solder joint from a previous repair. About 100 of the switch matrix pins had what looked like old paper capacitor wax on them, very sticky! I took all the pins out, cleaned each one and the sockets. (An ultrasonic cleaner would have been nice.) It took several attempts to get the clearance correct, since the jam nut moved but I finally figured out a system. Now it appears to test tubes just fine but it still has one problem that escapes me and wonder if anyone would have any ideas. It responds per the manual to all test cards except card 9, Gm, Low Ib. About half the time card 9 will kick power off and I'm guessing it's because the meter kicks backwards below zero when button 2 is pressed When it doesn't I can adjust Low Ib per the manual and seems to work fine. However sometimes the meter needle doesn't go below zero enough to kick the power out but when this happens the Ib control has no effect! Any ides or tips appreciated. 73 hank wd5jfr |
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