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Old 30th August 2012, 06:05 PM   #1291
labjr is offline labjr  United States
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I'm anxious to know what early builders think about it and how it compares to the F5.
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Old 30th August 2012, 06:06 PM   #1292
Zen Mod is offline Zen Mod  Serbia
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I like Romance

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Old 30th August 2012, 07:23 PM   #1293
lhquam is offline lhquam  United States
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well - if you need some gain , you can really put it instead of buffer and make nice integrated , with ball input
you can then connect two primaries in symmetrical manner , with overall FB connected from their CT to gnd (need to check that on paper , but seems logical in this moment )

but - do not forget that 1632 (and TSHA cousins ) like lowish impedance NFB net , resulting in lowish input impedance ; you need ball$ to drive it , too
And, if you float the power supplies you will get 2nd harmonic cancellation.
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Old 30th August 2012, 07:25 PM   #1294
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I'm anxious to know what early builders think about it and how it compares to the F5.
Our best source is Mr. Pass [earliest builder] who knows F5 and has been listening to F6. It is best to hear from him because he has the reference amps, loudspeakers and the experimental protocol to do a non-biased A/B comparison. Otherwise we may get conflicting reports!
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Old 30th August 2012, 07:38 PM   #1295
lhquam is offline lhquam  United States
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You do not need an opamp for balanced operation. Something this should also work and with floating power supplies will have 2nd harmonic cancellation. See also post #1055.



Quote:
Originally Posted by Zen Mod View Post
well - if you need some gain , you can really put it instead of buffer and make nice integrated , with ball input
you can then connect two primaries in symmetrical manner , with overall FB connected from their CT to gnd (need to check that on paper , but seems logical in this moment )

but - do not forget that 1632 (and TSHA cousins ) like lowish impedance NFB net , resulting in lowish input impedance ; you need ball$ to drive it , too
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Old 30th August 2012, 07:47 PM   #1296
lhquam is offline lhquam  United States
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I intend to order a prototype build of my PC board today. People who respond quickly can get added to the order. The cost will be about $30US per board plus shipping. Be warned that being a prototype board there could be design errors.
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Old 30th August 2012, 08:08 PM   #1297
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You do not need an opamp for balanced operation. Something this should also work and with floating power supplies will have 2nd harmonic cancellation. See also post #1055.
lhquam: You've thought "outside the box" of Conceptual F6. Your attached schematic is solely your design; most probably infused with inspiration by Conceptual F6. You have been free to explore, experiment and thus create a prototype bridge amplifier.
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Old 30th August 2012, 08:14 PM   #1298
lhquam is offline lhquam  United States
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Yes, and no. One you float the power supplies, you might as well go all the way to the circlotron. The only difference is the position of the negative rail power supply relative to the lower output JFET (ie. swap the order). Once you have done this, you can avoid the transformer altogether using the "Amazing FET Circlotron" front end.

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lhquam: You've thought "outside the box" of Conceptual F6. Your attached schematic is solely your design; most probably infused with inspiration by Conceptual F6. You have been free to explore, experiment and thus create a prototype bridge amplifier.
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Old 30th August 2012, 08:30 PM   #1299
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then you have double naked situation - you don't need OPA for gain ...... and using it instead of simple and effective buffer is .......... just imagine number of small critters packed in chain , due to necessary compromises in construction of every chip
Crossing out bad idea #42
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Old 30th August 2012, 08:31 PM   #1300
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I like Romance

Me too.
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