AVS Special Member
Join Date: Mar 2001
Location: Newport Beach, CA, USA
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The original upper cylinders in my two demo boxes were marked JD/B12. The lower cylinders were marked VEGS0419. I replaced the upper cylinders with consumer upper cylinders marked E06/JD.
My two consumer boxes came with upper cylinder nos. D13/JD and C22/JD. Both have lower cylinders marked VEGS0422.
I have two more spare upper cylinders: E06/JD and J08/JD, the J08 being the most recent purchase.
From all of the above the demo heads stand out as having the reversed number sequence starting with "JD". I would say it pretty certain you have original demo heads. You may be fortunate in having a demo machine that was used very little. The first sign that it's time to replace the heads will come when see clogging occur with new SVHS tapes, and/or difficulty playing back it's own recordings near the end of the tape.
Analog -- Always out of adjustment.
Digital -- Always one more bug.