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Old 11th March 2012, 07:21 PM   #131
bobodioulasso is offline bobodioulasso  Europe
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The amplitude of the output voltage to be considered is not 40v peak to peak but 20 volts peak.
Redo your maths starting from that
P= V peak*V peak/2R(load)
Depending on the output devices used you can increase the bias to 1.6A or even a bit more, though, for doubling the bias, better to double the output devices.

Last edited by bobodioulasso; 11th March 2012 at 07:30 PM.
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Old 11th March 2012, 07:33 PM   #132
jt1000 is offline jt1000
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No need to redo the calcs! I can blame the Gin on the last post, but not the first one. Hmm. Embarrassing! Lets forget all about that one...
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Old 28th January 2013, 04:14 PM   #133
soldersmoker is offline soldersmoker  United States
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Location: Austin, Texas
Maybe this will prove useful to someone, I dunno.

I listened to a friend's recently-acquired homebrew F5 yesterday, feeding a pair of Altec 605's in custom-built 620 cabs. He has a high-end set of sources and power line conditioning (he doesn't filter the power to his amps though). The F5 sounded fantastic. He prefers it to his 2A3 and Dynaco MkIII clones. He likes the extra headroom that 25 watts offers, saying something akin to "the F5 brings the Altecs to life." He also prefers the class A s/s sound to tubes because of the clearer presentation. I have to agree with him, and I'm a huge tubes fan. He has a number of other systems and he often listens to tubes, so he's no reactionary anti-tube bigot. It's just that the F5 with the Altecs sounds best to him (and damn good to me).

So, the original question was if the F5 can handle less efficient speakers. I don't know; it probably can in some circumstances, but I doubt it would sound its best. The F5 sounds great with Altecs, and that's surely worth something, as those drivers are very revealing. More important to me is that the F5 is capable of making something akin to magic, not just reproducing music. I could listen to that combo all day.

Damn, I wish I had the room and the money!

Last edited by soldersmoker; 28th January 2013 at 04:19 PM. Reason: clarification
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