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Balanced Monoblock F4s with very high Bias
Balanced Monoblock F4s with very high Bias
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Old 4th December 2018, 03:07 PM   #11
syracuze is offline syracuze  United Kingdom
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Balanced Monoblock F4s with very high Bias
They are 6 ohm nominal, probably going down to 4ohm min.

Though, I would love these amps to play well with potentially more demanding loads just in case I change my speakers in the future.

More important; I remember reading BA3 and F4 being subjectively more authoritative (3 mosfet pair output stages) compared to F5 with only 1 pair, so I donít want to loose that aspect
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Old 4th December 2018, 03:23 PM   #12
JeffYoung is offline JeffYoung  Ireland
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Balanced Monoblock F4s with very high Bias
With 23V rails you can only make use of about 5.5A into 4ohm. And even if you do run out of current drive this output stage will just drop into class AB rather than clip like a single-ended output would.

Beyond that I think you're just burning bias to generate heat to lower distortion. How fewer devices running at the same temperature will affect that I haven't a clue.
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Old 4th December 2018, 03:48 PM   #13
Zen Mod is offline Zen Mod  Serbia
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Balanced Monoblock F4s with very high Bias
Quote:
Originally Posted by syracuze View Post
......

Thoughts?
good luck finding a mate for IRFP150

good for one sex mosfets in output ( see Babelfish J thread) , but problematic for complementary ...... because there is no complementary , easily available

at least to my knowledge
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Old 4th December 2018, 05:49 PM   #14
syracuze is offline syracuze  United Kingdom
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Balanced Monoblock F4s with very high Bias
Yeah, now I get it.

Back to old plan then..
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Old 4th December 2018, 05:59 PM   #15
syracuze is offline syracuze  United Kingdom
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Balanced Monoblock F4s with very high Bias
Quote:
Originally Posted by JeffYoung View Post
With 23V rails you can only make use of about 5.5A into 4ohm. And even if you do run out of current drive this output stage will just drop into class AB rather than clip like a single-ended output would.

Beyond that I think you're just burning bias to generate heat to lower distortion. How fewer devices running at the same temperature will affect that I haven't a clue.
That is very true. I am very tempted with my theoretical 0.0006% distortion calculation in the very first post of the thread.
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Old 4th December 2018, 06:33 PM   #16
indra1 is online now indra1  Indonesia
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Only a few gifted people can discern distortion lower than 0.01%.
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Old 5th December 2018, 05:14 AM   #17
syracuze is offline syracuze  United Kingdom
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Balanced Monoblock F4s with very high Bias
Quote:
Originally Posted by indra1 View Post
Only a few gifted people can discern distortion lower than 0.01%.

I will see whether I am gifted enough


In all fairness, this is more of technically amazing case for the engineer inside me that I would love to figure out more.


No intentions to go for a distortion vs sound quality debate..
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Old 5th December 2018, 11:15 AM   #18
JeffYoung is offline JeffYoung  Ireland
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Balanced Monoblock F4s with very high Bias
This is DIY. Because it's technically interesting, or aesthetically pleasing, or a challenge, or oddball, or anything else that floats your boat are valid reasons to build. There's no requirement that everything be about sound.

(Not to refute Indra1's post, as the info is interesting. Just sayin'.)
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Old 5th December 2018, 11:34 AM   #19
indra1 is online now indra1  Indonesia
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Old 5th December 2018, 12:37 PM   #20
syracuze is offline syracuze  United Kingdom
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Balanced Monoblock F4s with very high Bias
Quote:
Originally Posted by JeffYoung View Post
This is DIY. Because it's technically interesting, or aesthetically pleasing, or a challenge, or oddball, or anything else that floats your boat are valid reasons to build.

Very well said
100% agree!
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