Quote:
Originally Posted by Chris K
There is something odd here. There's a coax cable coming off the on/off/volume control pot. If the cable is traced all the way to its other end, both the shield and the center wire connect to a 4 terminal terminal strip near the 6AU6 and the 6AL5. But back up at the volume control, the shield isn't connected to anything. The insulation is stripped back and the weave is exposed and twisted but it's not soldered to anything. I've checked the schematic briefly but I can't find it.
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Been a while since I've had mine open, but I can tell you having a coax shield grounded on only one end is a common practice for audio lines on 40s and 50s equipment...the outer shield of the coax isn't needed to complete the ground circuit because the items the coax connects are both hooked to chassis ground...The coax shield only needs grounding at one end to block the wire from noise pickup.
If the loose end looks like it was connected then something is going on, but if it looks like it never was connected it's probably fine that way.