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I've been looking for and integrated amp to mod, and I like the looks of the silver Yamaha's. Has anyone done one of these (modded)? I've seen some amps that I couldn't do much more than take the cover off, so I need one that can be worked on. Thanks, bobwire
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Couldn't resist
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
A friend of mine has been calling my new amp Yamy. I'm not sure I like that. Besides, I'm the only one who can nickname my own gear. And I do give them all colorful nicknames :-))
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yummy!
"Once this was all Black Plasma and Imagination" -Michael McClure
Thanks guy's, but I was hoping that someone had one of their newer amps. Since I been retired its gotten harder for me to do small-electronics. I was able however to do my Classe' Ten power amps. New Op-amps (lm4561 and 4562's)with 6800uF on all power pins, that, makes the op-amps disappear. 10,000uF added to the main storage caps with by-passes.(X4)And additional 4700uF across the 1000uF caps for the front end electronics. I want the Yamaha as a number two system and like the looks. Thanks, bobwire
This is a beautiful sounding amp just as it is. Best $400 I've spent on audio in a very long time.
All the electrolytics should probably be replaced if no one has serviced this unit since new, or if you cannot be sure that the electrolytics were ever replaced. A leaky capacitor can damage those unobtainium VFETs, if indeed this is one of the Yamaha amplifiers that used them.
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it would be a good idea at least to look into the age and condition of the electrolytic capacitors.
Sorry about the type-o.
I think the B1 amplifier was their best. And most who have heard it say it sounded excellent. Problem is/was that it uses a now unobtainium power transistor, called a "VFET". There are modern descendents of the VFET, but I don't think they can be retro-fitted. If the outputs blow, the amplifier may become a doorstop. (On the other hand, I think I read recently that Nelson Pass has a gaggle of VFETs.)
For that reason, if you buy a working B1 that has not been serviced in recent years, probably you should first of all replace the electrolytic capacitors. Lytics have a finite life span and when failing can take out those irreplaceable output transistors.
IXYS makes some 400W rated depletion mode FETs that can replace the original Yamaha part.
The B2 outputs are unobtanium.
nt
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