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In the Forum: Audio Discussions
In the Thread: Are Any Powerful Amps Worth Using?
Post Subject: Are you willing to consider push-pull?Posted by JJ Triode on: 1/25/2012
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Paul,
Rather than go SS, perhaps you should consider push-pull tube amps for each of your five 92-93 dB-efficient channels (I assume "channels" means frequency bands, not HT5.1 or similar.)  Along with that, consider using a modest amount of global negative feedback ("modest" means maybe 6-9 dB for pentode or ultralinear operation, or 2-4 dB for triodes or triode-connected pentodes, not the more typical 12-25 dB.)  Making the feedback adjustable (you can put a pot in the loop, and another at each input to give independent control of overall gain and damping) will give you a lot of control over the resulting Sound.  Having multiple impedance taps for each amp will help too.

You could start by buying five "Dynaco" Stereo 70 or Stereo 120 kits from Bob Latino and build each one differently for the targeted channel.  Later on if you need something different, you could rebuild any of them to his stock circuit (the front end is different from the original Dynakit btw) and sell them at little loss.  Sure it is a lot of labor but there is no escape from that anyway.  Or you could rebuild a bunch of different vintage amps for different bands.  There are plenty of options in PP.

Cheers,JJ

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