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Old 23rd July 2008, 06:53 PM   #1471
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all the .47R 3W panasonic resistors at digikey are gone-who would of done such a thing?
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Old 23rd July 2008, 06:57 PM   #1472
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I bought mine from Mouser.

Part number: 71-RS02BR4700FE12
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Old 24th July 2008, 07:21 AM   #1473
h_a is offline h_a  Europe
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Patrick, I'm now completely confused: are your findings for the stock F5? I thought you build only balanced?

Of course thank you very much for your insight and measurements! Very interesting!

Have fun, Hannes
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Old 24th July 2008, 12:42 PM   #1474
morfeas is offline morfeas  Greece
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Excuse me, but are you able to hear distortion levels that low (0.0x%) ?
Or is it that those figures give you info on other more significant parameters of the amp?

Thanks

PS: just a tube guy been happy with THD <5%.
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Old 24th July 2008, 01:39 PM   #1475
EUVL is offline EUVL  Europe
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> I'm now completely confused: are your findings for the stock F5? I thought you build only balanced?

I do.

The gain balancing refers to one half of the balanced circuit, with the intersection point of the X in the latter grounded.

a) There are folks who want to build only single ended.

b) Even for the balanced version, there is no harm to get some distortion cancellation on each half first.

Having said that, the strategy for the balanced version is different from the single ended. In the latter case, you might want minimum THD, or maybe minimum 2nd. In the former case, you don't care so much about even harmonics, as long as they are equal on both sides (left & right), but you might want to minimise the odd harmonics instead.


Patrick
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Old 24th July 2008, 01:44 PM   #1476
h_a is offline h_a  Europe
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I see! Thanks for clearing it up for me! All the best, Hannes
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Old 24th July 2008, 02:19 PM   #1477
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here are a couple of pics of my F5 "mule" amp. this was done on the cheap and made to be able to take apart and fiddle with-going to attempt P2P boards this weekend!
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File Type: jpg dsc01523.jpg (61.0 KB, 1826 views)
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Old 24th July 2008, 02:21 PM   #1478
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and another pic
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File Type: jpg dsc01524.jpg (60.9 KB, 1784 views)
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Old 24th July 2008, 03:08 PM   #1479
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Quote:
Originally posted by chrismercurio
I bought mine from Mouser.

Part number: 71-RS02BR4700FE12
Sorry. These were Vishay, not Panasonic.
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Old 24th July 2008, 06:54 PM   #1480
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Quote:
Originally posted by EUVL
In the former case, you don't care so much about even harmonics, as long as they are equal on both sides (left & right), but you might want to minimise the odd harmonics instead.
I believe I have mentioned previously that one of the strategies involves
cancellation of 3rd harmonics as well if you can play off the "compressive"
vs "expansive" 3rd.

The transconductance of push-pull fets is expansive with respect to increased
current and voltage and compressive with decrease voltage and current.
Generally, current is increasing with decreased voltage, and vice versa, and
you can look for a load line that minimizes 3rd.

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