Model 91 schematic? - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 27th November 2002, 06:32 PM   #1
Joel is offline Joel  United States
diyAudio Member
 
Joel's Avatar
 
Join Date: Oct 2002
Location: Brooklyn, NY
Default Model 91 schematic?

Does anyone know where online I can find a schematic of the Western Electric "model 91" amp? I can't seem to locate one.

I hear it described as a classic. The single pentode voltage amp/driver stage is interesting. Any thoughts on a #32 pentode driving a #45? I have two laying around.
I can't decide whether to do that, or just use a 6F8-G direct-coupled.

Joel
  Reply With Quote
Old 27th November 2002, 07:23 PM   #2
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Default WE 91

Hi,

I've got the circuit diagram of the WE91B and also a french adapation in some books.
Everything is in French though.

The B uses an input xformer,a 310A penthode (you won't need this stage) followed by another 310A driving a WE300B loaded by a WE171A OPT.

Joel,if you need a scan of it I can have it done at the shop close by.

Cheers,
__________________
Frank
  Reply With Quote
Old 27th November 2002, 07:38 PM   #3
diyAudio Member
 
Join Date: Aug 2002
Location: sylmar, CA. USA
Default 91a and associated history

http://www.aloha-audio.com/library/Rosetta_Stone.html

Read this article it has all that you want and more. A really interesting read.

Regards
Robert Morin
  Reply With Quote
Old 27th November 2002, 08:10 PM   #4
Joel is offline Joel  United States
diyAudio Member
 
Joel's Avatar
 
Join Date: Oct 2002
Location: Brooklyn, NY
Thanks guys.
Robert - that was an interesting page. Thanks.

Boy, they sure weren't afraid of stringing a whole bunch of stages together. They aren't "minimalist", that's for sure.
Lots of iron in there too.
  Reply With Quote
Old 27th November 2002, 08:12 PM   #5
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Default WE 300B

Hi Joel,

If you need further developments on these amps I intend to reread the articles on the mods by Jean Hiraga on the Zaila and WE amps.
Let me know if you're interested.

Ciao,
__________________
Frank
  Reply With Quote
Old 27th November 2002, 09:33 PM   #6
Noam is offline Noam  Canada
diyAudio Member
 
Noam's Avatar
 
Join Date: Oct 2002
Location: Hamilton, Ont.
Send a message via Yahoo to Noam
Default WE 300B

Definitely interested, Frank. I haven't seen those articles.

A group of nine of us are preparing to build amps based on the revised WE91 (SP#1 or Angela circuit), so any and all info is helpful.

cheers,
Noam
__________________
Gulf War II, the mother of all flash games http://www.idleworm.com/nws/2002/11/iraq2.shtml
  Reply With Quote
Old 27th November 2002, 09:39 PM   #7
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Default WE 91

Hi,

I'll have the articles scanned tomorrow and e-mail them to you.
Let me tell you up front these are one of the best 300B based amps I've ever heard.

See you,
__________________
Frank
  Reply With Quote
Old 27th November 2002, 10:42 PM   #8
Noam is offline Noam  Canada
diyAudio Member
 
Noam's Avatar
 
Join Date: Oct 2002
Location: Hamilton, Ont.
Send a message via Yahoo to Noam
Default Great!

Thanks a lot Frank, it'll be much appreciated. And for the comment too; I've never heard one of these amps, it's a blind-faith, they-twisted-my-arm thing. Jack E is already winding our transformers.

Noam
__________________
Gulf War II, the mother of all flash games http://www.idleworm.com/nws/2002/11/iraq2.shtml
  Reply With Quote
Old 27th November 2002, 10:53 PM   #9
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
Default Re: WE 91

Quote:
Originally posted by fdegrove
I'll have the articles scanned tomorrow and e-mail them to you.
Let me tell you up front these are one of the best 300B based amps I've ever heard.
Could I be included too please?
There were also a couple of extended articles in Glass Audio from about two years ago on the WE91A

Cheers
  Reply With Quote
Old 27th November 2002, 10:57 PM   #10
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Default SURE.

Hi Brett,

Long Time no see.

Sure,in fact I may have the GA articles as well and if you could post the scans here for me that I'll mail you I'd be grateful.

See,I still can't seem to post any local files from the PC to the forum.(firewall probably)

Cheers,
__________________
Frank
  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
Anyone have the ASL model MGSI15 schematic ? aldovan Tubes / Valves 3 20th February 2008 04:41 AM
Heathkit Schematic model AA-50 needed Sir Trefor Tubes / Valves 5 9th June 2007 01:51 AM
MXR Equalizer Model 170 schematic needed rh1530 Instruments and Amps 0 24th January 2004 01:54 AM


New To Site? Need Help?

All times are GMT. The time now is 07:31 PM.


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