Hi Dave,
Just checked my 8660C s/n 03700 something.? ? ?I measure 16.2 ohms to the chassis.? ?My 8660 has and 8660D power supply.....long story.? ?
I have not unplugged and removed from a rack my 8660 in about 20 years!?
92 means a wire colored white-red (white with a red stripe I guess).? ? HP used the standard color code on wiring.? ? Red usually meant a positive voltage with respect to chassis, black chassis,? violet a negative voltage with respect to the chassis, etc..?
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I repaired the last 8660 and plug-ins before the eastern region repair center became a calibration-only hub and consolidated the full service centers to Roseville CA.? ?At one time we had maybe 50-60 techs.? ? ??
I continue to work on HP instruments as a volunteer at the Antique Wireless Assoc. in Bloomfield, NY.? ? Haven't seen any 8660's come thru as donations from estates but plenty of 8640s.? ?Also just fixed up an HP410B and before that an HP 204 (or 209).? ? Now retired (from Harris).? working on the old HP instruments has been a blast from the past after working for HP for >24 years.? See plenty of other old common HP units.? ?
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