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In Reply to: RE: Marantz Model 18 posted by tesla on August 13, 2015 at 22:54:33
Tried Googling the Marantz part number? Be careful where you buy the bi-polar transistors for the amp heat sinks. Lots of fraud transistors out there. Stick with Digi-Key and Mouser as your suppliers to ensure original On-Semi replacements.
Just because you didn't know about it, doesn't mean it's a secret.
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Acually, I don't need the bipolar outputs, (I used NTE's) but I would like to replace the NTE's with the original p/n. I know that many will say the originals are not as good as the replacements, but I'd like to keep it as stock as possible. My other option is to replace all 4 with the same replacement.
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I've done a few projects that needed transistors replaced, and if you go with new, finding the exact replacement can be tricky, but you may wind up with superior parts. I've done the "find the original parts" thing and it gets expensive, and that's *when* you finally find them.
The problem I'm having now is that while working on a Philips 5781 (BIG power amp), the slew rate of the current equivalents I've found so far is below what they used originally. Smaller transistors have been pretty easy, if not very straightforward - Philips frequently used internal part numbers and private labeled the actual parts with those numbers, but they often can be tracked thru ECG numbers, then NTE, and then to other manufacturers' equivalents.
Finally, it's common to hear that if you replace old with new, you really should consider replacing them all with the same part, then do the rebias, etc, according to the manual. The Philips I mentioned above has *16*, hence my leisurely pace.
Then you need a parts list and be prepared to scour the vintage forums and ebay to find original parts. I'd guess that's going to be pretty tedious and difficult. I can appreciate your desire to keep the receiver as original as possible, but in this case I'd go with new, exact, quality replacement parts. Good luck whichever way you go.
Just because you didn't know about it, doesn't mean it's a secret.
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