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In Reply to: RE: Looking at Yamaho amps posted by bobwire on November 26, 2016 at 10:31:29
Sorry about the type-o.
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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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