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Old 4th February 2012, 09:57 AM   #11801
AndrewT is offline AndrewT  Scotland
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Select the jFETs by Idss as recommended. That's all you have to do.

Well, not quite.
I would accurately measure all the resistors and select to ~0.1%, both between upper and lower and between channels.

This makes for reliable current measuring later, if there are problems to be corrected.
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Old 4th February 2012, 11:22 AM   #11802
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I have setup the front end of my recently completed (well very nearly) F5 monoblocks according to what EUVL has suggested here: F5 power amplifier

I used the Toshibas (K1530,J201) on the output but didn't concern myself with any sort of matching there.
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Old 4th February 2012, 11:44 AM   #11803
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F5 power amplifier
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Old 4th February 2012, 11:55 AM   #11804
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Hey, is there an echo in here?
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Old 4th February 2012, 12:00 PM   #11805
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Originally Posted by triode_al View Post
who are the suitors then?
the dog will let me know, and it won't be good for them!
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Old 4th February 2012, 03:14 PM   #11806
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Originally Posted by giuliodido View Post
Hello,
I've not been able to find or to understand an explanation to the need of matching transistors in the original F5 amplifier.

Within a single channel, I "extrapolate" from various diyaudio threads that P and N MOSFETs don't need to be matched (also because they are technically different). But what about the JFETs?

I also "extrapolate" that matching MOSFETs and JFETs between left and right channel is not necessary (probably it's useful if I want to do the same operations to bias the two channels, but I'm not sure about it).

Any help is really appreciated
To operate, there is really no requirement that the parts be matched. I like them all matched, simply because I want both channels to match as close as possible. It just depends on how obsessive you want to be....

russellc
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Old 4th February 2012, 04:43 PM   #11807
Renron is offline Renron  United States
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If the parts are mismatched, couldn't some of the discrepancy be compensated for in the bias settings? If a sensitive dB meter was used? Notwithstanding the minimal difference in distortion between channels. ?
Ron
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Old 4th February 2012, 06:22 PM   #11808
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Originally Posted by Nelson Pass View Post
I see you left room for F5 Turbo parts.

The text will be done in a few days - you will see it next week.

Turbo? Sounds good
If that means more power - same quality, i guess it will be a choice for my second amp, as i am plannig to drift to two-way active system cofiguration.

Best regards.

D.
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Old 4th February 2012, 08:54 PM   #11809
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I see you left room for F5 Turbo parts
Is the schematics of the F5 Turbo released by Papa ? I heard about it 2 months ago on this forum but I have been very busy since then...

Thanks
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Old 4th February 2012, 09:38 PM   #11810
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They should be sometime next week.
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