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In Reply to: RE: Looking at PP amp designs posted by David Smith on August 02, 2014 at 18:50:17
"Eico HF 81,86 and 87, Pilot 232, Fisher X100, Heathkit W3M..."
Exactly, plus many Harman Kardons (HK250, A224, A230, A250, A300, A500), Fisher 20A, SA100, 80AZ, Dynaco ST-35, Heathkit AA-151, etc. The list is almost endless.
Now, if we're talking about recent designs, I honestly haven't kept up with commercial offerings over the last 20 years or so. If in fact fixed bias is being used more frequently, I'd suspect it's primarily for the higher power models. Not only does fixed bias provide more available voltage with a given HV transformer, cathode resistors become somewhat unwieldy (and wasteful) in larger amplifiers.
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Buy Chinese. Bury freedom.
Follow Ups:
Ok, single or a couple/few models for entire lineup and mostly marginal not so popular or cheap amps. Not a single modern amp.No Audio Research,VTL , Conrad Johnson , Manley (?),VAC, McIntosh, who else is making tube amps in this country ?..There is nothing to argue about it actually , I'm just curious why cathode bias were and is used more often or almost exclusively abroad while when I see (modern) circuit designed in US in 99 out of 100 is fixed.
Didn't realize you were referring only to current designs. There could be many reasons, and the trend might have nothing to do with considerations for sonics. Are you comparing similar topologies and power levels when you look at the European designs? Like I said before, fixed bias is typically used at higher power levels.
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Buy Chinese. Bury freedom.
Edits: 08/03/14
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