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Old 22nd February 2010, 09:55 AM   #11
Yvesm is offline Yvesm  France
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Quote:
Originally Posted by Rod Coleman View Post
Salut Yves,

Tell us about the output transformer - was it the quality you used at ETF2009? With success!

The design of that transformer would be interesting to see.
Short before lunch . . .


Do we meet ? Refresh my brain please !

I like to claim that I've built this amp ONLY to check the OPT !
Indeed, the ETF09 shotout was just the pretext to do something using those legendary triodes

Yves.
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Old 22nd February 2010, 10:14 AM   #12
regal is offline regal  United States
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What is F .315 in your PS schematic? Do you have a part # for it?


Also you may consider a larger ultrapath cap C1 ?
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Old 22nd February 2010, 10:30 AM   #13
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What is F .315 in your PS schematic?
Fuse, 315mA.

Tom
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Old 22nd February 2010, 11:07 AM   #14
Yvesm is offline Yvesm  France
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Originally Posted by regal View Post
. . .
Also you may consider a larger ultrapath cap C1 ?
As said before C1 is not Utrapath and can't be because the cathode of the 300B is (almost) grounded.
C1 is just here to reduce PSU impedance at hi end.
Probably higher value won't hurt if this does not disturb the serie regulator.

Guys, all your remarks urge me to bring to amp back on the bench for further tests
I'll consider that while taking a nap

Yves.
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Old 22nd February 2010, 03:17 PM   #15
Yvesm is offline Yvesm  France
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Since you've asked:

http://www.dissident-audio.com/SE_300B/KISS/DA143.pdf

Yves.
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Old 22nd February 2010, 05:12 PM   #16
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Yves,

I like Heretical design approaches, so I am a fan of Dissident Audio for designs like PC900 phono, DIY curve tracer, and of course DIY OPT.

I did not show for ETF2009, but found some Shootout results:

European Triode Festival - ETF2009 Shootout

Vraiment, il est remarquable de battre Partridge OPT à un concours - félicitations!!
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