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Old 16th July 2007, 10:20 PM   #911
mpmarino is offline mpmarino  United States
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Quote:
Originally posted by Nelson Pass


I think it would be fine stock. I wouldn't bother to alter anything.
I would expect a little shy of 200 watts.




thank you master
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Old 17th July 2007, 01:39 AM   #912
mpmarino is offline mpmarino  United States
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Quote:
Originally posted by mpmarino





thank you master
Oh, but if I may?......

Do you object to lowering the rails a couple volts, due to the fact that I have lower voltage trafos up the -ss? What would you consider the minimum before we have to start to make changes? I'd ask about the irfp140 but I already know the answer.

Thanks
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Old 17th July 2007, 01:50 AM   #913
Magura is offline Magura  Denmark
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Quote:
Originally posted by mpmarino

due to the fact that I have lower voltage trafos up the -ss
Ok, now that's gotta hurt


Magura
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Old 17th July 2007, 02:18 AM   #914
Nelson Pass is offline Nelson Pass  United States
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F4 power amplifier
Quote:
Originally posted by mpmarino
Do you object to lowering the rails a couple volts.
No problem by me. Turn the bias up to make up for it.

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Old 17th July 2007, 02:18 AM   #915
mpmarino is offline mpmarino  United States
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Quote:
Originally posted by Magura


Ok, now that's gotta hurt


Magura

naah, I just use somebody else's.
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Old 17th July 2007, 02:47 AM   #916
mpmarino is offline mpmarino  United States
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Quote:
Originally posted by Nelson Pass


No problem by me. Turn the bias up to make up for it.

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Old 17th July 2007, 03:16 PM   #917
spencer is offline spencer  Singapore
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I am also building my F4 amp now but only up to pcb stage. Need more time to design the heat sink, casing and build it. Just share one photo first.

Spencer
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Old 19th July 2007, 05:11 PM   #918
gl is offline gl  United States
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Recent discussions on the Aleph-X builders thread involving Nelson Pass and others indicate that 1) a small amount of single ended bias can produce an audible improvement in a complementary follower output stage and 2) that this SE bias can be added passively.

In the F4, connecting a 100 ohm 20W-25W power resistor from the output node to V- would add approximately 5W of SE bias and would be cheap and easy to try.

Perhaps someone who has built an F4 could be talked into trying this and reporting back (Steen?)

Cheers,
Graeme
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Old 21st July 2007, 06:46 PM   #919
Jon Ver Halen is offline Jon Ver Halen  United States
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Default Mine arrived yesterday

Front view
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Old 21st July 2007, 06:47 PM   #920
Jon Ver Halen is offline Jon Ver Halen  United States
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Default Back View

Note the single balanced input and the dual unbalanced (RCA) inputs.
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