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Old 25th December 2012, 10:51 AM   #331
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Old 3rd January 2013, 02:37 AM   #332
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Hi Juma

I am getting a few of the parts I don't have, to build your amp.

I have a number of 2SK170-BL's, across the full spec. range.
I need to get some 2SJ74-BL's to go with them.

What would your prefered Idss be for the input devices ?
I possibly have a choice here.

Cheers.

Si.
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Old 3rd January 2013, 06:48 PM   #333
juma is offline juma  Germany
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Anywhere in BL range id OK - practical differences are negligible. If you can choose, 8-10mA is a choice that's narrow enough.
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Old 4th January 2013, 11:24 AM   #334
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Juma, would you say that your F5 with 2SK2013/2SJ313 is the most sonically pleasing amp that you've built as yet?
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Old 4th January 2013, 11:22 PM   #335
juma is offline juma  Germany
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In this category of amps (Class A, 20W, 4 Ohms drive capability, voltage gain>0dB) I found nothing that I like more...

Last edited by juma; 4th January 2013 at 11:24 PM.
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Old 5th January 2013, 04:11 AM   #336
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Quote:
Originally Posted by juma View Post
In this category of amps (Class A, 20W, 4 Ohms drive capability, voltage gain>0dB) I found nothing that I like more...
Thanks Juma. Now that is saying a lot in favour of your amp. O.K. I have all the components except heatsinks, so maybe I should give this a go. But I am also attracted to Nelson's ACA in view of its tube-like sound and lower Pd
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Old 5th January 2013, 08:34 AM   #337
juma is offline juma  Germany
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Originally Posted by Samuel Jayaraj View Post
... in favour of your amp. ...
It is still Mr. Pass' amp. I just used different output devices and excluded the current limiting protection circuit.
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Old 5th January 2013, 12:30 PM   #338
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True, the topology and particularly the feedback is from Mr.Pass but you took it steps ahead by using then available better output devices. I may go with 4 pairs of Output devices.
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Old 5th January 2013, 04:42 PM   #339
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what is different from the Pass BA-3 frontend ?
looking at schematics I see only minor difernces
I really can't figure out why this is a poweramp, and the BA-3 only a gain/driver stage

btw, some time ago I worked hard to find good TO-220 devices for the F5
maybe some of them could be good ?
or is it all down to these special Toshiba devices ?
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Old 5th January 2013, 06:20 PM   #340
tinitus is offline tinitus  Europe
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maybe this pair ... IRFZ14 / IRF9Z14 ?

http://docs-europe.electrocomponents...6b807912c5.pdf

http://docs-europe.electrocomponents...6b8079172b.pdf
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