At 09:49 AM 09/19/08, you wrote: >Eric, > >(big chunk cut out) > >When I looked up the 1-80739B57 diodes, I found them to be NLA, but the >description is "BD EYLTD". That doesn't make much sense, unless the diodes >were offered only as an assembly.
All 01-part numbers are assemblies, frequently done by outside contracting firms. I was told once that several of the contract shops that Moto used were run by retirees. There is a breakdown of the first two digits of every Moto part at <http://www.repeater-builder.com/motorola/numerical-parts-categories.html>) In that table it says that 01 is "Miscellaneous assemblies (Make or Buy). In your shoes I'd do what Neil WA6KLA showed me once - I stopped by the shop one day to pick up a new manual that just came in (a 4-receiver Micor repeater) and we were going out to lunch - we hopped into his Dodge Interceptor and as we pulled out of the lot he said we had to do a quick side trip - we stopped by an alternator shop and dropped off a diode plate. We had lunch, then picked it up on the way back to the shop. He commented during lunch that some alternators use the design where they have the diodes mounted in two plates with some diodes having "normal" polarity, and the rest are "reverse". Swapping diodes in a plate was a standard repair trick. All that the repair guy needed to know when installing the new diodes is if the lead is the anode, or if the case is the anode, and the diode current (there are diodes for the 35-50amp alternators, and there are Diodes for the 100a alternators, and there are DIODES for the 200a oversize alternators used in special applications. He also commented that he had to call around to 7 different shops to find ones that could swap the diodes in a plate, and that he chose the particular shop that we went to because they offered to press out the old diodes and press in new ones the same day, and for a few dollars extra they'd do it while we waited. Neil was more interested in lunch than waiting (and I didn't blame him). Neil chose to replace both diodes in the power supply, and the total cost of two new diodes pressed in place plus the "while you wait" surcharge was cheaper than a new Moto assembly and it was in your hand the same day. And no, I don't know if that diode plate that got rebuilt that day came out of a Micor supply. It could have been GE, RCA, or even EFJ. Mike WA6ILQ
