In the last couple years there have been about 20 posted to Fleabay, of which 18 were non functional.
The 771A sounds better, but blows up worse.
The B doesn't sound good and still blows up.
OTOH the rack mount Altec biamps are nice.
Vintage Altec 1609A Biamplifier 150W 50/60Hz USA - eBay (item 320545003392 end time Jun-14-10 12:25:55 PDT)







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