CJ

META-Transformers New
« on: June 15, 2004, 08:56:31 PM »
----------------------Transformers---------------------------
                 

This is a meta-thread, made to allow you to keep track of the posts concerning this single issue - I will continue re-editing this first post.

- All should be contained in this first post - which is re-edited regularily.

- Everyone is welcome to reply with comments and pointers to things they consider relevant. This will be copy/pasted into the first post, if the meta-keeper finds it relevant. (I deeply dislike censorship, but here it seems necessary for the sake of overview)

- On a regular basis, replies will be copied to the first message and deleted, then bumped to the top.

-----
Theory-Articles and Links

Output Transformer Winding
http://www.geofex.com/article_folders/xformer_des/xformer.htm

DIY Transformer Info:
http://ludens.cl/Electron/trafos/trafos.html

An article by Brian Sowter's father on transformer core material.
http://vacuumbrain.com/The_Lab/TA/META_Transformers/core_material.pdf

A PDF on Distributed Capacitance:
www.datatronics.com/pdf/ distributed_capacitance_paper.pdf

http://sound.whsites.net/xfmr.htm
Beginners Guide To Transformers-Rod Elliot

http://www.groupdiy.com/index.php?topic=15619
Transformer articles from Audio Engineering Magazine from sodderboy

http://www.groupdiy.com/index.php?topic=13562
M6 vs M4 -  and other good core steel info

Which transformers can I use where?
Lab Link

http://www.groupdiy.com/index.php?topic=162

Transformer info thread...
http://www.midcom-inc.com/pdf/TN69.pdf
70 page pdf on transformer theory and design.

http://www.ee.surrey.ac.uk/Workshop/advice/coils/power_loss.html#lams
Interesting reading on transformer theory.

http://www.groupdiy.com/index.php?topic=436
Using power transformers as output transformers

PRR's explanation of the complex trade-off's in winding audio transformers. Excellent.
http://www.groupdiy.com/index.php?topic=5513

Col McLyman book
http://d1.amobbs.com/bbs_upload782111/files_53/ourdev_725050HHOGA4.pdf

Reuben Lee book
http://www.tubebooks.org/Books/Lee_1955_Electronic_Transformers_and_Circuits.pdf

Wonderful link from Blankrazor
http://vintagewindings.com/products/TransDesign1.html

Inside Transformers
https://mysite.du.edu/~jcalvert/tech/transfor.htm

Magnetic Circuits and Transformers-MIT Electrical Engineering Staff   Great Online Book!
https://babel.hathitrust.org/cgi/pt?id=uc1.b4154646;view=1up;seq=37

Glossary of Magnet Terms
QuoteModifyRemove
https://www.duramag.com/glossary/

The Magnetic Circuit       -    V. Karapetoff
Has Graphical Solution to Optimum Air Gap
https://babel.hathitrust.org/cgi/pt?id=mdp.39015006056918;view=1up;seq=1;size=150


Catalogs and Pinouts:


http://www.waltzingbear.com/Schematics/UTC.html
UTC Pinout Charts

http://bama.edebris.com/manuals/utc/

BeyerDynamic TX catalog
https://home.kpn.nl/chickennerdpig/FILES/BeyerDynamic_AudioInputTransformers_catalog.pdf

Catalogs

http://208.190.133.201/old_iron/
More catalogs

http://www.pmillett.com/transformer_data.htm
more catalogs

http://www.one-electron.com/FC_Trans.html
More catalogs

All kinds of goodies including transformer catalogs
http://www.audiophool.cjb.net/Techno.htm

Nice collection of catalog links:
http://www.bunkerofdoom.com/xfm/index.html

Transformer DIY

Supplies

Edcor  and Heyboer  sell stuff

UK Core Material from Sahib>


http://powermagnetics.co.uk/pace-magnetics.html

http://www.edson.co.uk/consumables.html

http://www.ascocomponents.co.uk/

http://www.lhcomponents.co.uk/

https://www.wiltan.co.uk/

http://powermagnetics.co.uk/pace-magnetics.html

http://www.edson.co.uk/consumables.html

http://www.ascocomponents.co.uk/

http://www.lhcomponents.co.uk/

https://www.wiltan.co.uk/


Winding Info
http://www.turneraudio.com.au/output-trans-winding.html

SE Output Design Software:
http://www.dissident-audio.com/OPT_da/Page.html

DIY Transformer winding page:
http://www.turneraudio.com.au/output-trans-winding.html

Build your own trafo, choke, ... whatever! - part supplies in Europe
http://www.groupdiy.com/index.php?topic=8616

http://www.ee.surrey.ac.uk/Workshop/advice/coils/
A very good in-depth explanation of various aspects of winding magnetics..

Tape and Insulation Thread
http://groupdiy.com/index.php?topic=57735.msg735659;topicseen#msg735715

Library

The Bible on audio transformers-Not For Beginners:
Transformers for Electronic Circuits - Second Edition,
Nathan Grossner

Transformer and inductor design handbook, 3rd ed. 15mb .pdf:

http://ebook.pldworld.com/_eBook/-Power%20Electronics-/TRANSFORMER%20and%20INDUCTOR%20DESIGN%20HANDBOOK%203rd%20Edition,%20Revised%20and%20Expanded/ourdev_725050HHOGA4.pdf

 

The Bible on core material
Ferromagnetism (Hardcover)
by Richard M. Bozorth

Equally Incredible:
Electronic Transformers and Circuits, 3rd Edition(Illustrated)
Ruben Lee, Charles E. Carter, Leo Wilson


Outstanding - Easier For Beginners:

Transformer and Inductor Design Handbook
Colonel Wm. T. McLyman,
Marcel Dekker, Inc., New York, 1978.


Mostly Data Tables:
Magnetic Core Selection for Transformers and Inductors (Electrical and Computer Engineering) (Hardcover)
by Colonel Wm. T. McLyman



Handbook of Modern Ferromagnetic Materials (The International Series in Engineering and Computer Science) (Hardcover)
by Alex Goldman


Handbook of transformer design and applications
William M. Flanagan
Publisher: McGraw-Hill Professional - 01 January, 1993
Format: Hardcover
List price: USD 89.95


Authoritative Book On Insulation:
Handbook of Electrical and Electronic Insulating Materials
2nd ed.
W. T. Shugg


These two are new to me.
Apparently Wolpert was an engineer at Peerless.

"Audio Transformer Design Manual", Wolpert, $36, privately published, available from: Robert G.Wolpert 5200 Irvine Blvd. #107 Irvine CA 92720

or
Title: Audio Transformer Design Manual
Author: Robert G. Wolpert
ISBN: None
Bindery: GBC
Pages: 108
Source: Angela Instruments
10830 Guilford Road
Suite 309
Annapolis Junction, MD 20701
USA
Phone: (301) 725-0451

TRANSFORMERS DESIGN AND MANUFACTURING MANUAL, by Robert Wolpert, Self Published

Rewinding transformers with CAD
Hugh Wells W6WTU Ham Radio Dec '86 p.83

Fast Optimization of Transformer Design
EDN Nov '62 by Davis, J. H

RDH4
Radio Designers Handbook

Testing Transformers

http://www.groupdiy.com/index.php?topic=14591
Testing unknown transformers
Microphone Input Transformer Characteristics

Lab Link - Pucho
http://www.groupdiy.com/index.php?topic=6571&highlight=web+info

How Many Ohms Is It?
http://www.groupdiy.com/index.php?topic=6512&highlight=utc+a21
_________________

Take - A - Parts

http://www.groupdiy.com/index.php?topic=5402
Peerless K-241-D Mic Input - Another CJ hacksaw essay..!

http://www.groupdiy.com/index.php?topic=341
100-X update.

http://www.groupdiy.com/index.php?topic=413
transformers

http://www.groupdiy.com/index.php?topic=334
Transformer DIY "1st try"

http://www.groupdiy.com/index.php?topic=310
Lundahl LL2911 in ribbon mics, thanks to Kevin Carter

http://www.groupdiy.com/index.php?topic=396
Newbie Transformer Questions............

http://www.groupdiy.com/index.php?topic=402
Peer-less S*217* D repro by Magnequest

http://www.groupdiy.com/index.php?topic=464
Are these Xformers good for anything?

http://www.groupdiy.com/index.php?topic=447
Output transformer question

http://www.groupdiy.com/index.php?topic=2982
1:2 output transformer questions

http://www.groupdiy.com/index.php?topic=2973
UTC A-10 and HA-100X Turns

http://www.groupdiy.com/index.php?topic=13562
M6 vs M4 -  and other good core steel info
                 
http://www.irt.de/IRT/publikationen/braunbuch/V72_EUE.pdf
V72 output transformer blueprints

http://www.kevinsgarage.50megs.com/output.txt
output iron specs

http://members.tripod.com/richard984/transformer_math.htm

http://www.cfd.tu-berlin.de/~panek/

http://stiftsbogtrykkeriet.dk/~mcs/Transformer.html

http://www.pulseeng.com/pdf/4022.pdf
Good reading material.
http://www.du.edu/~jcalvert/tech/transfor.htm

Beyer transformer catalouge and info at Kubi's place
www.kubarth.com/temp/bd_gb/trafokatalog.pdf
www.kubarth.com/temp/bd_gb/trafokatalog2.pdf

More good reading.

http://www.reed-electronics.com/ecnmag/article/CA421393?nid=2311
Some basics.

http://www.turneraudio.com.au/htmlwebpgs02/outputtrans.htm
Patrick Turner has some great design information here.

http://www.magnequest.com/tech.htm
This is a link to the Tech area of Magnequest Transformers.
You can ask questions about transformers in the forum.

http://www.pulseeng.com/default.aspx
Click on "Lybrary" at the top, then "White Pages."

http://www.protolam.com/page8.html
Short articls on nickel lams.

http://www.valvediy.com/ramseypg1.html   
Parafeed Calculations

http://www.butlerwinding.com/core-types/index.html
Good overview on cores and other things

http://www.vacuumbrain.uk
A few odds and ends at my site...

« Last Edit: January 24, 2019, 11:58:58 PM by CJ »
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html


gyraf

Re: META-Transformers
« Reply #1 on: October 21, 2016, 04:47:45 AM »
..note to self: don't let Harman run your company..

clintrubber

Re: META-Transformers
« Reply #2 on: June 01, 2017, 06:55:04 AM »
Up-to-date 2017 link to BeyerDynamic TX info: 

BeyerDynamic TX catalog

(38 pages, 1.9MB)

CJ

Re: META-Transformers
« Reply #3 on: October 29, 2017, 03:51:26 AM »
adding this online book to the Meta,

Magnetic Circuits and Transformers     M.I.T.   EE Staff

https://babel.hathitrust.org/cgi/pt?id=uc1.b4154646;view=1up;seq=37
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

Whoops

Re: META-Transformers
« Reply #4 on: January 10, 2018, 07:59:23 PM »
http://sound.westhost.com/xfmr.htm
Beginners Guide To Transformers-Rod Elliot

updated link for that article (old link doesnt work anymore)

http://sound.whsites.net/xfmr.htm

CJ

Re: META-Transformers
« Reply #5 on: January 10, 2018, 08:46:00 PM »
thanks Whoops! link fixed, also added links from Sahib and Blankrazor full props going out,  cj
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

biosynth

Re: META-Transformers
« Reply #6 on: October 12, 2018, 06:17:06 PM »
A really big thank you for all these classified informations!!!
A lot of work!

+++
 :-* :-*  :-*

CJ

Re: META-Transformers
« Reply #7 on: January 08, 2019, 01:11:50 AM »
Transformer Blueprints from Lab Teardowns here>
http://vacuumbrain.uk

Links to GroupDIY Transformer Teardowns>

Music Man HD OPT
https://groupdiy.com/index.php?topic=63730.msg806843#msg806843
Egnater Tweaker 88 Power XFMR
https://groupdiy.com/index.php?topic=64493.msg816686#msg816686
Carvin X-100 OPT
https://groupdiy.com/index.php?topic=65062.msg824417#msg824417
Acoustic 164 OPT
https://groupdiy.com/index.php?topic=65090.msg824778#msg824778
Sovtek Mig 50 OPT
https://groupdiy.com/index.php?topic=66259.msg839022#msg839022
Ampeg Reverb Rocket 2 OPT
https://groupdiy.com/index.php?topic=66866.msg848010#msg848010
Manley Vari-Mu Input Transformer
https://groupdiy.com/index.php?topic=67531.msg858209#msg858209
Carnhill VTB9046
https://groupdiy.com/index.php?topic=61039.msg773090#msg773090
Neve EQ Inductors
https://groupdiy.com/index.php?topic=61022.msg772937#msg772937
Marshall Drake Pwr Choke
https://groupdiy.com/index.php?topic=61090.msg773903#msg773903
Echoplex Power Transformer
https://groupdiy.com/index.php?topic=61170.msg774892#msg774892
Sears Silvertone 1474 OPT
https://groupdiy.com/index.php?topic=61283.msg776258#msg776258
Melodium E 40 ES
https://groupdiy.com/index.php?topic=67907.msg862950#msg862950
Ampeg Portaflex Power XFMR
https://groupdiy.com/index.php?topic=61830.msg783306#msg783306
Peavey 5150 OPT
https://groupdiy.com/index.php?topic=62249.msg788638#msg788638
Tascam Portastudio Pwr XFMR
https://groupdiy.com/index.php?topic=62417.msg790950#msg790950
Schaller KV-40 Pwr XFMR
https://groupdiy.com/index.php?topic=62462.msg791521#msg791521
Magnetone Varsity OPT and Pwr XFMR
https://groupdiy.com/index.php?topic=63391.msg802913#msg802913
Carvin X Series 3 OPT
https://groupdiy.com/index.php?topic=58251.msg741169#msg741169
Sears Silvertone 1484
https://groupdiy.com/index.php?topic=59899.msg760438#msg760438
Fender Tremolux 1959 Tweed OPT
https://groupdiy.com/index.php?topic=60266.msg764482#msg764482
Marshall Mk. 2 Fifty Watt OPT
https://groupdiy.com/index.php?topic=60904.msg771506#msg771506
Peerless 16402
https://groupdiy.com/index.php?topic=35658.msg437757#msg437757
UTC LS-68 Hybrid
https://groupdiy.com/index.php?topic=35694.msg438204#msg438204
Freed Scully 280
https://groupdiy.com/index.php?topic=35874.msg440410#msg440410
Western Electric 94E
https://groupdiy.com/index.php?topic=35859.msg440271#msg440271
UTC Ouncer O-8
https://groupdiy.com/index.php?topic=35975.msg441730#msg441730
ADM Output XFMR
https://groupdiy.com/index.php?topic=35939.msg441227#msg441227
Triad HS-35 Innerstage
https://groupdiy.com/index.php?topic=35991.msg441941#msg441941
Freed 6L6 OPT
https://groupdiy.com/index.php?topic=36092.msg443247#msg443247
Freed 38166 Lang PEQ
https://groupdiy.com/index.php?topic=36225.msg444957#msg444957
Peerless 15067 70.7 OPT
https://groupdiy.com/index.php?topic=36434.msg447533#msg447533
Peerless K-049-D Input XFMR
https://groupdiy.com/index.php?topic=68751.msg875250#msg875250
UTC A-23  600 to 4/8 Spk
https://groupdiy.com/index.php?topic=36294.msg445836#msg445836
Triad A-57-J Line to Line
https://groupdiy.com/index.php?topic=36285.msg445760#msg445760
UTC 65959
https://groupdiy.com/index.php?topic=36224.msg445333#msg445333
Microtran M-4919
https://groupdiy.com/index.php?topic=36409.msg447331#msg447331
Chicago Transformer TA-10 Input
https://groupdiy.com/index.php?topic=36407.msg447302#msg447302
Kenyon T-6 Input
https://groupdiy.com/index.php?topic=36383.msg447020#msg447020
Kenyon T-3 Input
https://groupdiy.com/index.php?topic=36341.msg446528#msg446528
Cinemag Custom Input
https://groupdiy.com/index.php?topic=36324.msg446312#msg446312
Western Electric 186-E OPT
https://groupdiy.com/index.php?topic=36509.msg448500#msg448500
UTC H-70 Choke
https://groupdiy.com/index.php?topic=36493.msg448358#msg448358
Newcomb TR-91 Input XFMR
https://groupdiy.com/index.php?topic=36473.msg448188#msg448188
UTC CG-133 Innerstage XFMR
https://groupdiy.com/index.php?topic=36464.msg448010#msg448010
Hexa Filar XFMR
https://groupdiy.com/index.php?topic=36436.msg447542#msg447542
JBL Model 5901 Input XFMR
https://groupdiy.com/index.php?topic=36425.msg447475#msg447475
Stancor WF-21 Input XFMR
https://groupdiy.com/index.php?topic=36416.msg447388#msg447388
Stancor HF-40 Bridging
https://groupdiy.com/index.php?topic=36303.msg445921#msg445921
Haufe Teardowns
https://groupdiy.com/index.php?topic=36529.msg448649#msg448649
Triad JAF-31 Line to Line XFMR
https://groupdiy.com/index.php?topic=36513.msg448535#msg448535
Telefunken V72 Choke 
https://groupdiy.com/index.php?topic=36618.msg449841#msg449841
Insulation Materials
https://www.eis-inc.com/electrical-insulating-material-insulation-paper-and-film/c-ph2112
UTC HA-100X
https://groupdiy.com/index.php?topic=35743.msg438922#msg438922
UTC 65959
https://groupdiy.com/index.php?topic=36224.msg445333#msg445333
 UTC A-26 Output XFMR
https://groupdiy.com/index.php?topic=35639.msg437637#msg437637
UTC GR-815 (A-20)
https://groupdiy.com/index.php?topic=55127.msg703622#msg703622
Ampeg Gemini OPT
https://groupdiy.com/index.php?topic=56321.0
Western Electric 5124 6L6 OPT
https://groupdiy.com/index.php?topic=56148.msg716509#msg716509
HP 400D Power XFMR
https://groupdiy.com/index.php?topic=56210.msg717176#msg717176
Masco MA-808 OPT
https://groupdiy.com/index.php?topic=56251.msg717637#msg717637
Ampeg Gemini 2 OPT
https://groupdiy.com/index.php?topic=56577.msg721734#msg721734
Fender Twin Reverb Choke
https://groupdiy.com/index.php?topic=56542.msg721389#msg721389
Triad HS-29 Innerstage XFMR Tests
https://groupdiy.com/index.php?topic=57092.msg727527#msg727527
Fender Vibro Champ OPT Antique Electronics
https://groupdiy.com/index.php?topic=50425.msg638924#msg638924
Fender Princeton Reverb OPT Antique Electronic
https://groupdiy.com/index.php?topic=50957.msg646928#msg646928
UTC A-39
https://groupdiy.com/index.php?topic=51616.msg655866#msg655866
Crimson Audio CT-2385  API OPT
https://groupdiy.com/index.php?topic=51638.msg656131#msg656131
Pro Co DI XFMR
https://groupdiy.com/index.php?topic=51666.msg656446#msg656446
Telefunken V72 Choke Rewind
https://groupdiy.com/index.php?topic=51676.msg656638#msg656638
Telefunken V72 pwr Xfmr
https://groupdiy.com/index.php?topic=51693.msg657296#msg657296
UTC LR-878  RCA BA73 Preamp Transformers
https://groupdiy.com/index.php?topic=51844.msg659062#msg659062
Telefunken V74 OPT
https://groupdiy.com/index.php?topic=52025.msg662277#msg662277
Telefunken V72a OPT
https://groupdiy.com/index.php?topic=52024.msg662273#msg662273
Telefunken V72a Plate Inductor
https://groupdiy.com/index.php?topic=52033.msg662432#msg662432
Telefunken V72a Pwr XFMR
https://groupdiy.com/index.php?topic=52064.msg662883#msg662883
Telefunken Bv14155 OPT
https://groupdiy.com/index.php?topic=52046.msg662667#msg662667
Allen AC1331 Input XFMR
https://groupdiy.com/index.php?topic=52404.msg668136#msg668136
Allen AC1323 OPT
https://groupdiy.com/index.php?topic=52460.msg668892#msg668892
Neumann U-87 BV-13
https://groupdiy.com/index.php?topic=57351.msg730838#msg730838
Marshall Pwr Supply Choke Drake T-100
https://groupdiy.com/index.php?topic=61090.msg773903#msg773903
Ampeg V4 OPT
https://groupdiy.com/index.php?topic=57835.20
Triad HS-52 OPT
https://groupdiy.com/index.php?topic=58139.msg740019#msg740019
Triad HS-50
https://groupdiy.com/index.php?topic=58230.msg740896#msg740896
UTC H-23
https://groupdiy.com/index.php?topic=68766.msg875393#msg875393
UTC M-1433
https://groupdiy.com/index.php?topic=68722.0
UTC Y-6431
https://groupdiy.com/index.php?topic=55073.msg702982#msg702982
UTC Ouncer O-9
https://groupdiy.com/index.php?topic=15050.msg174987#msg174987
UTC A-25
https://groupdiy.com/index.php?topic=9325.msg114257#msg114257
UTC A-48
https://groupdiy.com/index.php?topic=14219.msg165167#msg165167
UTC LS-140
https://groupdiy.com/index.php?topic=35773.msg439639#msg439639
UTC A-24
https://groupdiy.com/index.php?topic=35712.msg438439#msg438439
Triad HS-56
https://groupdiy.com/index.php?topic=58093.msg739559#msg739559
Triad A-200-P
https://groupdiy.com/index.php?topic=19184.msg224124#msg224124
Triad 108
https://groupdiy.com/index.php?topic=60266.msg764568#msg764568
Fender Blues Jr OPT
https://groupdiy.com/index.php?topic=68868.msg877108#msg877108
Fender Bluse DeVille OPT
https://groupdiy.com/index.php?topic=69570.msg888153#msg888153
Supro Sahara
https://groupdiy.com/index.php?topic=65729.0
Stancor WF-21
https://groupdiy.com/index.php?topic=36416.msg447388#msg447388
Peerless 15036
https://groupdiy.com/index.php?topic=65681.msg839031#msg839031
Western Electric 197-A
https://groupdiy.com/index.php?topic=35635.msg437741#msg437741
Stancor P-8130
https://groupdiy.com/index.php?topic=60150.msg763099#msg763099
Altec/Peerless 16402
https://groupdiy.com/index.php?topic=55035.msg702415#msg702415
Acoustic 164
https://groupdiy.com/index.php?topic=65090.msg824778#msg824778
Willesden EM 20014 Transformer Standon Herts England
https://groupdiy.com/index.php?topic=67951.msg863802#msg863802
Western Electric 618 B
https://groupdiy.com/index.php?topic=35586.msg437238#msg437238
McMurdy 2001
https://groupdiy.com/index.php?topic=19156.msg223804#msg223804
BV 14155
https://groupdiy.com/index.php?topic=52046.msg662667#msg662667
Webster Electric WST-419
https://groupdiy.com/index.php?topic=36499.msg448449#msg448449
Newcomb TR-139
https://groupdiy.com/index.php?topic=60055.msg762012#msg762012
Freed 32035
https://groupdiy.com/index.php?topic=35874.msg440410#msg440410
Webster Electric WST-419
https://groupdiy.com/index.php?topic=36499.msg448449#msg448449

« Last Edit: January 08, 2019, 01:21:05 AM by CJ »
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

CJ

Re: META-Transformers
« Reply #8 on: January 18, 2019, 07:02:08 AM »
Sales
Thanks's to Ed and the rest of the gang!

Audio Transformers
http://home.earthlink.net/~rogerr7/autran.htm
Doc Hoyer - Only Authorized Winder For MacIntosh and Marantz

altran - usa
http://www.altrancorp.com/
NOTE: they don't generally sell to individuals
make the A variant transformer for OSA MP-1
and the HJFP and HVTP2 transformers for Hamptone
soon hamptone.com will stock the altran audio units they use for sale to DIYers

amplimo - netherlands
http://www.amplimo.nl/amplimo.html?target=dept_27.html&lang=en-us
make some very affordable 1:1 and stepup (1:5 24 euro, 1:15 27 euro) transformers
and some more robust ones that cost more

Audisar Transformers
http://www.vetcosurplus.com/audisar/

avel lindberg - usa
http://www.avellindberg.com/
a good standard line of toroids

amveco / talema - usa
http://www.amveco.com
pcb mount encapsulated
and chassis mount
available from:
http://www.digikey.com

avon magnetics:
http://www.avonmagnetics.co.uk/
do custom audio transformers
have docs for all the old gardners designs
but their repros are VERY expensive

Baffwindings
http://www.baffwindings.co.uk/
UK based transformer company

Bartolucci
http://www.audiomarketing.net/bartolucci
Iron from Italy. Uses the C core approach.
Has high value inductors which could be good in a Telefunken V72/76.

Bauer Communications
http://www.bauertransformers.com/
1124 Barstow Ave.
Eugene Oregon 97404
800-627-7277
541-689-0893
make similarly specced but cheaper models relative to jensen
the low ratio ones are supposed to be nearly as good as the jensens, the higher ones not so much
harder to get ahold of, but could be a bargain

beyerdynamic - germany
Beyer
they make a line of physically tiny transformers
mostly mic and line input
not too expensive but minimum orders may apply
contact your local beyer rep

b├╝rklin - germany
http://www.buerklin.com/
some inexpensive iso and mic input transformers
and some high quality toroid input and output transformers
usa office: (970) 429-1265
audio 1:1 iso - C105.900 (16 euro)
mic input - C106.000 (21 euro)
high quality 1:1 input - C106.100 (52 euro)
high quality 1:1 output - C106.400 (52 euro)

Butler Winding
Good background info also
http://www.butlerwinding.com/core-types/index.html

carnhill - uk
www.carnhill.co.uk
www.vintech-audio.com (us)
making vintage neve repro units they bought out st ives, who did make neve trannys
BUT marinair designed all of the classic ones,
and so the claim of "original" sounding trannys is in dispute.
will sometimes do custom designs.
good quality. expensive and often difficult to deal with.
carnhill has minimum orders. vintech will sell single units in the US.

cinemag - usa
http://www.cinemag.biz
make transformers for many pro audio shops
most units in the $40 range
quality comparable to jensen for less money
will sell single units direct
crimson audio transformers - usa

Crimson
http://www.crimsonaudiotransformers.com/
2612 Gerhardt St
Cape Girardeau, MO 63703
Phone: (573)334-6656
make a 1:1 line input, 1:10 mic input an

edcor - usa
http://www.edcorusa.com/magnetics/audio/audio_transformer.htm
somewhat large physically, unshielded
can do custom work
very inexpensive - no nickel cores; generally suited to line output

electra-print - usa
http://www.electra-print.com/lineoutput.html
make a few custom and one 600:15k stepup ($50)
as well as one 8:1 output stepdown ($83)
shielding costs extra

experience electronics - germany
http://www.experience-electronics.de/englisch/bauteile/studio-uebertrager.htm
a range of mic input and 1:1 line in and out transformers
mostly in the 25 to 50 euro range

hammond - usa
http://www.hammondmfg.com/5caud.htm
a good selection and good product
will do custom work
relatively expensive

harbuch - australia
http://www.users.bigpond.com/harbuch/harbuch/default.htm
http://www.users.bigpond.com/harbuch/harbuch/audiom2.htm
http://www.users.bigpond.com/harbuch/harbuch/audiotx2.htm#input
kev has used these and likes them
they are have some inexpensive units if you're in this part of the world

haufe - germany
http://www.haufe-uebertrager.de
i'm pretty sure they made many of the trafos
in the old telefunken v-series preamps
not much info on the site
apparently they sell a small T14/1 (AKG C-12 output) for 35 euro
and some of the v-series chokes are available

jensen - usa
www.jensen-transformers.com
very good, clean sounding
lots of info, application notes, etc. on webpage
expensive, but you get what you pay for

lm audio - australia
http://www.jlmaudio.com
makes a toroid 1:10 input and an api 2503 like output
also a 1:4 input and a 1:1:1 gapped output

lundahl - sweden
www.lundahl.se
see site for distributors
an expanding selection of very high quality units
one or two vintage repro units - rca bc-2b
may do custom design with enough demand
used in a number of gyraf designs!
less expensive than some but very good
generally very transparent

lynx audio - brazil (thanks fabio)
http://www.audiolink.com.br/audiolink/transformadores/audio.htm
small range of line in and out transformers

magnequest:
http://www.magnequest.com
owner of all the peerless and acrosound docs
mostly amp output trafos and chokes
they do make a b7 15k that can be reversed for a 1:5 stepup
they are considering making altec/peerless 15905s
have made S-217-D (pultec OPT) in the past for $300ea

majestic - uk
http://www.transformers.uk.com/product01.htm
custom only, but do vintage hifi repro
mostly output, power, and chokes

monacor - germany
http://www.monacor.de/en/produktseite_gesamtprogramm.php?artid=2651&spr=EN&typ=u
electronic parts vendor stocks a few valuable and inexpensive
they don't have a US distributor, but you can order through
http://www.musicians-gear.com
which has good prices with not so great shipping

neutrik - liechtenstein (fun to say)
http://www.neutrik.com
look under products > accessories > transformers
they make a few mu-metal shielded units
which look similar to lundahls
and some really tiny non shielded ones
they are inexpensive here in the usa
ask your local neutrik rep

OEP - UK
http://www.oep.co.uk
make a limited but versatile selection
sold thru farnell- newark can order them in the usa
sell seperate mumetal shield cans.
inexpensive but good when you want to hear the transformer working

pikatron - germany
http://www.pikatron.org/ueberd.htm
jakob mentioned they still make replacement
trafos for the old neumann preamp modules
they also make an inexpensive 1:10 stepup (20 euro)

plitron - canada
http://www.plitron.com
also do pricey hifi tube output transformers
tamura - global
Tamura
tube interstage and output

profile electronics
http://www.profileelectronics.com/

radio shack - usa
this item has two decent 1:1 line transformers inside for $16:
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&product%5Fid=270-054
it sounds terrible, but maybe that's what you want; $3:
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&product%5Fid=273-1380

sescom - usa
http://www.sescom.com/audio/audio.html
make a few decent looking units MI and R series
the ones with any shielding are almost as expensive as jensens
some have had problems getting a response from them

shinrock - germany
http://www.shinrock.de
some very nice info on telefunken gear
mostly custom designs, telefunken and amp repro
shinrock - germany
http://www.shinrock.de
some very nice info on telefunken gear
mostly custom designs, telefunken and amp repro

www.sowter.co.uk
good quality, some vintage repro units (incl neve)
will sometimes do custom designs
less expensive for some things
will sell single units direct

Sowter - USA
www.groupdiy.com
Exclusive USA distributor of Sowter Transformers.

stevens and billington - uk
http://www.stevens-billington.co.uk/
make a range of mu-shielded line in and out and mic in transformers
individuals can buy direct

Transmagcorp
http://www.transmagcorp.com/
Custom torroids and other goodies-Lowell,MA.

Schumacher
known for their guitar amp outputs
they do custom work
http://www.schumachercorp.com

http://www.sumr.com/default.htm
Richard Summer Technology. Torroidal transformers from Canada[/img]

tab-funkenwerk - usa
http://www.tab-funkenwerk.com/id2.html
oliver archut is the expert on all things telefunken related
offers mic output transformers and V7x series replacement iron

toroid corp of maryland - usa
http://www.toroid.com
205-5076 is a tube preamp power transformer for $91
their standard line is on the pricey side

triad - usa
http://www.parallaxpower.com/Catalog/catalog.html
now a part of magnetek, renamed parallax
they used to make a wide range of audio trannys
now just telephone stuff mostly tho they do say they could do custom work

utc - usa
was bought out by opt industriesnow owned by magnetika aka torwico
http://www.magnetika.com
they claim to be able to make all the old stuff but you have to order a lot
and their prices change seemingly randomly call "frank" at either
(732) 364-1800 x103 or
(908) 454-2600 x290
for more info

v&f transformers
http://www.vf-transformer.com/

victoria magnetics - usa
http://www.victoriamagnetics.com
will do one-off custom jobs for reasonable price
also does other transformers

Volny
http://www.volny.cz/mgberan/
Czech transformers
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

 

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