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Old 28th April 2008, 01:26 AM   #481
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Quote:
Originally posted by Nicola
Thanks Mr Pass, look forward to read it, hopefully there will be soon also article like the 6moons or by J Lowther to get a taste of the quality and listener differences between the several models. But may I ask you how would qualify / compare F5 to F1 or F3, if I may.

By the way, do you plan to build & sell some through RenoHifi?
I am not planning a write of up the subjective differences between the
models, but Srajan at 6moons will undoubtedly offer his own opinion.

They will be available from Mark@renohifi shortly, although I probably
should tell him about it.



There will be a short piece on tweaking F5's, and then the next major
article is about buffers.
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Old 28th April 2008, 07:16 AM   #482
EUVL is offline EUVL  Europe
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> I have two (balanced) versions .....
> There will be a short piece on tweaking F5's ....

We all keep our plans on hold then !!!



Patrick
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Old 28th April 2008, 11:37 AM   #483
TimS is offline TimS  New Zealand
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Default High Power Balanced F5

To run the amp at a higher supply voltage, as some one suggested, I tried cascoding the input JFET's but I really couldn't find much advantage. I find just adding resistors fixes the problem and the performance is almost identical.

I think this is my last iteration of this design, I have tried many other variations with not much improvement in the performance. Though I may scale the design down for a preamp.

I think my next step will be to build it. I have the heatsinks, the transformers and most of the metal work for the case. I just need to design a board and find some JFETs.

Cheers

Tim
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Old 28th April 2008, 11:51 AM   #484
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Tim,
While you're at your computer, could you possibly scale this cct down to drive a pair of headphones from 32R (grado ) up to 600R (Senn), with matched pairs of k170+j74 and 610+9610? And still have Zin of >100kR?
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Old 28th April 2008, 04:16 PM   #485
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F5 sans inquietude thermique:

Click the image to open in full size.
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Old 28th April 2008, 05:43 PM   #486
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Default Subjectivty on F5

Quote:
Originally posted by Nelson Pass

I am not planning a write of up the subjective differences between the models, but Srajan at 6moons will undoubtedly offer his own opinion.

There will be a short piece on tweaking F5's, and then the next major article is about buffers.

Some "subjective differences" are more subjectives that others
& i'm pretty sure your comment are factuals. But so far is there some spec that provide an indication on power, damping factor, distortion, as you have been writing on F2, F1, none of them where that subjective.

"and then the next major article is about buffers" avaialable under FistWatt.com ?

Regards
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Old 28th April 2008, 08:34 PM   #487
TimS is offline TimS  New Zealand
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Quote:
Originally posted by jameshillj
Tim,
While you're at your computer, could you possibly scale this cct down to drive a pair of headphones from 32R (grado ) up to 600R (Senn), with matched pairs of k170+j74 and 610+9610? And still have Zin of >100kR?

I could probably do that, I could make it a preamp that is able to drive headphones, but do you realize, you would have to cut the plugs off your headphones and replace them with a 4 pin plug.
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Old 28th April 2008, 10:49 PM   #488
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Default Re: Subjectivty on F5

Quote:
Originally posted by Nicola
But so far is there some spec that provide an indication on power, damping factor, distortion, as you have been writing on F2, F1, none of them where that subjective.

"and then the next major article is about buffers" avaialable under FistWatt.com ?
FistWatt. I like that.

Suffice it to say that the F5 has more power, more damping,
more current, more bandwidth, lower distortion, and higher
input impedance than the other F's. Many will think it sounds
better.
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Old 28th April 2008, 10:52 PM   #489
SCD is offline SCD  Canada
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Hmmmmm
Bigger, better, stronger, faster. All the good things in life

You got to like that.
What about lemony fresh?

Why does AxP take so long to get to my house
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Old 28th April 2008, 11:06 PM   #490
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If you Google "Fistwatt", you will get 9 references.

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