Author Topic: 214A...Unusual grounding issue  (Read 671 times)

Offline DocWurly

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214A...Unusual grounding issue
« on: September 18, 2015, 10:15:45 AM »
This is a problem that I already "solved," but not in a way I felt good about, and I think more should be done.

It was a 214A in generally excellent condition.  (This is the later standalone classroom model).  But when the grounding wires that connect at either end of the hum shield were disconnected, the Wuritzer made a horrible, sustained 60 khz belch.  Not a minor hum, but the obliterating audio-short-circuit sound.

The simple solution was to keep these wires connected to the reed bar while working on it, but usually that is not essential.  When assembled, it sounds great--no hum, as clean as I've heard one of these sound.  But I am assuming that there is something disconnected in there, and that these two ground wires are compensating for a job that is not being done elsewhere, and that eventually there will be consequences.  Any things I should especially check?  What normally grounds the reed bar in the 200A series, when those 2 wires aren't connected?