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I have two 535's one early and one late production. The late one is operational but the early one had one of the wafer switches burn up. It does work but the trigger is now fixed. I got the early one when I was in high school in 1977 so I will keep it maybe some day I will find a parts unit. They are handy in winter to use as space heaters. Tube scopes can be handy when working on high voltage devices, the input stage tubes can take a boo boo better soild state scopes. I've had to repair a few front ends on soild state scopes so I have a few small tube scopes to use if I'm working on something that might spike my good scopes.
Steve
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