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I can email relevant sections of the service manual if you think it may help you out. Thanks in advance to anybody who can help or shed some light on this. I work at an aerospace research lab and have access to all the test equipment and thermal paste I may need. Could something else have aged to cause the bias to be thrown off and thus the transistor to fail? (Because if so, and I just replaced the transistors (a couple $$), they'd likely fail again.) Might the biasing pots have failed? I'm thinking I might just want to replace the output transistors and the pots, rebias them (I got a hold of a copy of the service manual, with proper values).ĭo you think it could be something else? Should I just bite it and take it in to a tech? If I told a tech this story, do you think they'd be able to diagnose things rather quickly? Where is a good place to buy these types of output transistors? I've heard that there are some counterfeit ones floating around, and that really wouldn't help anything, were I to end up with one of these. I'm pretty sure nobody has adjusted the bias. Maybe it had been running hot for a while and just finally fizzled? So the output transistor(s) is fried, what caused this. Looks like the thermal heat sink grease on the back of the big one (a Toshiba 2SA1302), well, one of the big ones was nearly completely dried out. That being said, I'm thinking it was one of the output transistors. Since it's symmetric (output transistors mirror each other on each side of the heat sink). The heat seemed to be centered towards one side of the heat sink. Not even a faint hiss.Īlso, a couple of observations before it died. I also tried running the preamp out from the Dussun to the amp-in on the NAD. It doesn't matter which input I have selected, CD, tuner, tape, the sound is exactly the same. I can tell what song is playing (because I'm familiar with the CD) but just barely. When playing a CD, I can definitely hear it playing but it's extremely scratchy and distorted. I tried playing both radio, and cd through the preamp section of the NAD with no luck.
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I tried hooking the preamp out to the amp in of another amp I have (Dussun V8i). Honestly, I think there may be more than one problem. After about 4 or 5 minutes at a low to moderate volume (hooked up to B&W DM602 S2 speakers), with the impedance selector at 8 ohms and the soft clipping switch off (it heats up with soft clipping on as well), it got extremely hot and stopped playing (did not turn off). I thought maybe it was a ventilation problem (although my stand has plenty of space above the receiver), so I left the receiver out in the open. Sure enough, she was running rather hot, but playing beautifully. So after hearing this story, I thought I'd give it a try. At that point, it was put away until it was rediscovered about a week ago (and thus gifted over to me). The previous owner (family member) said it was used a decent bit up until about 7 years ago when the observation was made that it was running hot. This receiver was given to me about a week ago. Hopefully I'll be able to contribute more to the forum over the next couple weeks. I think this might get a bit long, but please bear with me. I've been doing a lot of googling and I found a similar thread archived here with some pretty insightful responses (way to go guys!).