Quote:
Originally Posted by vortalexfan
Hello everyone last year I told you about an old Bell Carillon tube stereo system from the 1960s that I was working on for someone and in turn I was going to get a Luxman Stereo Power Amplifier that I was going to fix up.
Well I got that Luxman Power Amplifier and I figured out that the issue it was having was with the a couple of transistors and resistors in the front end on the unit that got fried somehow.
the resistors which are R419a, R19b, R420a and R420b which are a matched quad of 100 Ohm 1/3 Watt Flameproof resistors were toasty looking and when measured with an ohmmeter, measured at over 1,100 0hms (1.1 kOHms).
Then transistors which were Q407a, Q407b, Q408a and Q408b had burn marks on the board below them like they may have gotten too hot or overheated, the transistors in question are a complementary set of transistors consisting of a set of 2SA949s and a set of 2SC2229s.
Which when I looked them up online the only transistors that cross referenced to them was the NTE 383 and the NTE399 respectively but not many places carry those transistors anymore that I feel comfortable with buying from, and then the resistors are also nearly impossible to find either because it seems that Mouser and Digikey neither of them carry any 100 Ohm 1/3 W flameproof resistors in their inventory without having to special order them which they say could take 13 weeks or more.
Any ideas as to how I could go about fixing this without having to special order parts or having to sink too much money into it, as I would like to fix this Luxman up and flip it for a nice tidy profit, as I was told I could turn around and sell this Luxman Amp for around $600 or more once it was fixed up.
Thanks for your help.
Picture of the unit in question posted below, picture was taken off the internet and isn't mine, as mine is in pieces right now, but its the same exact model as mine.
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Don't install NTE semiconductors in a Luxman or use improper parts in one. This is a very respected amplifier. Please don't take shortcuts. TV shop Grade semiconductors don't belong here, unless there is no other option, they won't perform correctly. And these transistors need to be suitable for this circuit. Most HiFi circuitry has specific transistor characteristics which must be adhered to for it to be stable and perform as intended.