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Old 17th July 2008, 03:50 PM   #1401
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Old 18th July 2008, 01:15 AM   #1402
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Default On a different note

At the risk of over stating the obvious, I think this would make a pretty good multi-channel home theater amp.

Especially since it only needs one transformer per 2 channels and the heat sinks need not be so huge.

Once boards are available, I bet a few will build it as such.
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Old 18th July 2008, 01:45 AM   #1403
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Default Re: On a different note

Quote:
Originally posted by vdi_nenna
At the risk of over stating the obvious, I think this would make a pretty good multi-channel home theater amp.

Especially since it only needs one transformer per 2 channels and the heat sinks need not be so huge.

Once boards are available, I bet a few will build it as such.
As Al used to say with respect to heatsinks for this amplifier "You need bigguns"

(That's from "Married with Children").

It's like 0.8 C/W -- or like a 36C kind of heatsink.
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Old 18th July 2008, 01:53 AM   #1404
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Yeah, I guess you're right. They'd be biggums alright. One would have to love big amps to build something that enormous.
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Old 18th July 2008, 08:58 AM   #1405
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A multi-ch. amp doesn't need to join the heatsinks at the hip like e.g. an Aleph-5, so you can get away with fairly small heatsinks, for example the familiar and cheapo 9-flange SK53 type.
Still a double or triple D-cup, but no bigg'uns.

(Hands Up who likes to hold a weenie during TV watching and dream of the shoe sale racket.)
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Old 18th July 2008, 09:29 AM   #1406
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Old 18th July 2008, 11:20 AM   #1407
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Should have known Barskey the Kid favors a Pro gunslinger 2-hand approach.
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Old 18th July 2008, 12:29 PM   #1408
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There's got to be some psycological/soicialogical reason why guys do that. Me included.
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Old 18th July 2008, 02:52 PM   #1409
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Back to the feedback network in the f5. Looking at the more triditional method on the right for the moment neglecting the
common feedback resistor. Distortion in one jfet will be injected
into the other one by the voltage developed across r15 giving
a push pull distortion signiture. So we have a pushpull front
end runing a push pull output stage.

But in the f5 the front end is operating as a pair of single devices
this is powering the push pull output stage.

Hay I could be wrong but like the girl in the song said "at least I
an't drinking"
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Old 18th July 2008, 03:07 PM   #1410
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Quote:
Originally posted by woody
Back to the feedback network in the f5. Looking at the more triditional method on the right for the moment neglecting the
common feedback resistor. Distortion in one jfet will be injected
into the other one by the voltage developed across r15 giving
a push pull distortion signiture. So we have a pushpull front
end runing a push pull output stage.

But in the f5 the front end is operating as a pair of single devices
this is powering the push pull output stage.

Hay I could be wrong but like the girl in the song said "at least I
an't drinking"

yup - that's exactly the point - in F5 each input jfet can't see and feel another one ;

they are diff amplifier , but not LTP ;

Papa probably tested each variant , and decided/implemented what's more kinky

devil is in details , we agree on that already
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