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Old 2nd November 2013, 09:04 PM   #41
generg is offline generg  Germany
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Ironamp Video Posted
So it must be a deep secret….

when even you are afraid to speak it out…..
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Old 2nd November 2013, 09:13 PM   #42
generg is offline generg  Germany
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Ironamp Video Posted
some postings back I wrote….

"There is one SJ28 KF instead of KE but it is not outside…….
As far as I remember the KE and KF was a pinch Off voltage and this marking seems not very important for the matching of Iron AmP or the SONY AmP….."

i wrote this because the one KF I had was embedded in the KE lines…

But the SK82 KD I used for Mikes L´Amp clearly needs lower gate voltage for the same drain current….

So the classes are important, sorry…only the one KF seems not to behave correct….

in the picture the two left curves are the KD….!
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File Type: jpg KD KE KF SITs.JPG (368.5 KB, 658 views)
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Old 3rd November 2013, 07:09 AM   #43
Ejam is offline Ejam  Australia
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Default Bias Circuit

Michael

You alluded to a bias supply (18 to 24V) in the video but did not give any circuit details. Do you have a circuit?
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Old 3rd November 2013, 08:19 AM   #44
nicoch58 is offline nicoch58  Europe
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He use a Bench Power Supply
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Old 3rd November 2013, 11:43 AM   #45
flg is offline flg  United States
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Quote:
Originally Posted by generg View Post
what´s a "snafu"…..
Situation Normal, All F$%^&d Up
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Old 3rd November 2013, 11:53 AM   #46
Zen Mod is online now Zen Mod  Serbia
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Ironamp Video Posted
snafu means simply - they ooked me again

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Old 3rd November 2013, 12:18 PM   #47
vdi_nenna is offline vdi_nenna  United States
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Quote:
Originally Posted by Ejam View Post
Michael

You alluded to a bias supply (18 to 24V) in the video but did not give any circuit details. Do you have a circuit?
Use same bias circuit as L'amp amps, but change voltage regulator to a 7924.
DC supply should be a few volts above 24 volts.
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Old 11th November 2013, 12:37 AM   #48
Soundhappy is online now Soundhappy  France
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Ironamp Video Posted
Quote:
Originally Posted by Michael Rothacher View Post
Yes, it's certainly an homage to the WE25B. Though I'd love to have some some more info on that one, if anyone would like to share.
Its my pleasure sir Rothacher voici Western Electric 25B
amplifier mono blocks photos with his schematic
and interesting original article
from French Jean Hiraga revue " L'Audiophile "

L'amplificateur Nmsis, ou l'hommage au WE 25 B (J.Hiraga)

Zoom & have fun



Attached Images
File Type: jpg WE-25B mono block and 540 AW Speaker.jpg (203.2 KB, 532 views)
File Type: jpg WE-25B 1.jpg (887.0 KB, 541 views)
File Type: jpg WE-25B 2.jpg (307.6 KB, 405 views)
File Type: jpg WE-25B 3.jpg (464.8 KB, 393 views)
File Type: jpg WE-25B 4.jpg (339.8 KB, 153 views)
File Type: jpg schematic first WE25B.jpg (493.7 KB, 217 views)
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Old 11th November 2013, 01:16 AM   #49
Soundhappy is online now Soundhappy  France
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Ironamp Video Posted
This is Nemesis amplifier part II article

L'amplificateur Nmsis -2- montage et mise au point (J.Hiraga)

Early period amplifiers like 7-A from Western Electric
have transformer coupled inter stage
and 11-A be another interesting single-ended iron amplifier

Western Electric - Rosetta Stone for Triodes

Hope You enjoy !
Best regards
Attached Images
File Type: jpg we7A .jpg (57.3 KB, 215 views)
File Type: jpg we11a.jpg (61.1 KB, 165 views)
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Old 11th November 2013, 09:01 PM   #50
DIYspaceW is offline DIYspaceW  Slovenia
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Very minimalistic , coool !!!
I just hope the supplies of sony 2sk82 will stil last for a while...)
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