Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 2nd November 2013, 09:04 PM   #41
generg is offline generg  Germany
diyAudio Member
 
generg's Avatar
 
Join Date: Jul 2009
Location: Near Frankfurt
So it must be a deep secret….

when even you are afraid to speak it out…..
__________________
and the First Wtt is......a really First Class PSS Idea
  Reply With Quote
Old 2nd November 2013, 09:13 PM   #42
generg is offline generg  Germany
diyAudio Member
 
generg's Avatar
 
Join Date: Jul 2009
Location: Near Frankfurt
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….!
Attached Images
File Type: jpg KD KE KF SITs.JPG (368.5 KB, 336 views)
__________________
and the First Wtt is......a really First Class PSS Idea
  Reply With Quote
Old 3rd November 2013, 07:09 AM   #43
Ejam is offline Ejam  Australia
diyAudio Member
 
Join Date: Aug 2004
Location: Queensland
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?
  Reply With Quote
Old 3rd November 2013, 08:19 AM   #44
diyAudio Member
 
nicoch58's Avatar
 
Join Date: Oct 2004
He use a Bench Power Supply
__________________
Sic58
  Reply With Quote
Old 3rd November 2013, 11:43 AM   #45
flg is offline flg  United States
diyAudio Member
 
flg's Avatar
 
Join Date: Jul 2005
Location: North East
Quote:
Originally Posted by generg View Post
what´s a "snafu"…..
Situation Normal, All F$%^&d Up
__________________
"It was the perfect high end audio product: Exotic, inefficient, expensive, unavailable, and toxic." N.P.
  Reply With Quote
Old 3rd November 2013, 11:53 AM   #46
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
snafu means simply - they ooked me again

__________________
my Papa is smarter than your Nelson !
tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb ; Papatreasure
  Reply With Quote
Old 3rd November 2013, 12:18 PM   #47
diyAudio Member
 
vdi_nenna's Avatar
 
Join Date: Oct 2000
Location: PA, USA
Blog Entries: 1
Send a message via Yahoo to vdi_nenna
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.
__________________
I build, therefore I am.
  Reply With Quote
Old 11th November 2013, 12:37 AM   #48
diyAudio Member
 
soundhappy's Avatar
 
Join Date: Oct 2012
Location: Montpellier near Mediterranean Sea France
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, 217 views)
File Type: jpg WE-25B 1.jpg (887.0 KB, 217 views)
File Type: jpg WE-25B 2.jpg (307.6 KB, 178 views)
File Type: jpg WE-25B 3.jpg (464.8 KB, 175 views)
File Type: jpg WE-25B 4.jpg (339.8 KB, 83 views)
File Type: jpg schematic first WE25B.jpg (493.7 KB, 108 views)
__________________
class A amplifiers with full range speakers sings
like angels in heaven
  Reply With Quote
Old 11th November 2013, 01:16 AM   #49
diyAudio Member
 
soundhappy's Avatar
 
Join Date: Oct 2012
Location: Montpellier near Mediterranean Sea France
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, 100 views)
File Type: jpg we11a.jpg (61.1 KB, 80 views)
__________________
class A amplifiers with full range speakers sings
like angels in heaven
  Reply With Quote
Old 11th November 2013, 09:01 PM   #50
diyAudio Member
 
Join Date: May 2009
Very minimalistic , coool !!!
I just hope the supplies of sony 2sk82 will stil last for a while...)
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Was this already posted here? Handmade tubes video Thunau Tubes / Valves 6 15th January 2008 02:02 AM
4 pin S-video to component video RCA GUS Digital Source 1 19th June 2004 01:05 AM
VGA to S Video/ S Video to RCA Mitch Parts 17 24th February 2003 01:21 PM


New To Site? Need Help?

All times are GMT. The time now is 09:57 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2