Yow, this receiver was a gen-you-ine PITA to source the parts for. There are two transistors in each of the two Power Amplifiers. They're what's called a Complementary Pair, which means one is a PNP type, and the other is an NPN type, and their characteristics are matched to each other. There are several part numbers for each pair, -BUT- while I could easily find one of the pair, the other one was nowhere to be found for any of the suitable parts I was searching for. I was finally able to hook up with a forum member who had purchased a large number of these when they were still available, and after contacting him he agreed to sell me TEN of each type I needed.
So I now have enough of the correct parts to finish the Power Amplifiers, and have some spares for future use.
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Before I retired 6 years ago, I worked as a test engineer in a fair-sized contract OEM, we did everything from board builds to box builds and design/development. I do recall the absolute PITA it was to find obsolete parts for boards, and the high risk of counterfeit/damaged or otherwise bad parts. A number of times a customer had to redesign a board because an IC had gone impossible to find.
ReplyDeleteYep, BTDT! And far too many of the parts are chineseium fakes.
DeleteYou don't give up!
ReplyDeleteNever Give Up! Never Surrender!
DeleteSooner or later, most of this ancient stuff will be unobtanium unless you're willing to pay the price. Hopefully, you are covered for the time being.
ReplyDeleteAs an aside, we just ordered Starlink for the RV as we will probably get on the road pretty soon.
At least I didn't get gouged for the parts. Prices were very reasonable.
DeleteBe careful. Back in the old daze, the PNP version of the complementary pair was the weaker of the two. Using a 40409/40410 pair, the PNP would always fail first.
ReplyDeleteThat's why I wanted these two part numbers. The ratings are the same for both of the pair.
DeleteOutstanding! And 'that' is what friends are for!!!
ReplyDeleteOh, YEAH! My friends on the Celica Supra forum have helped me many, many times. Both with advice, and with parts. The guys over at the Audio Karma forum are equally good.
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