Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

TEC S-15 amp (1961 !): main amp schematics
TEC S-15 amp (1961 !): main amp schematics
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
Thread Tools Search this Thread
Old 6th January 2012, 05:12 PM   #1
Orit is offline Orit  Italy
diyAudio Member
Join Date: Feb 2007
Location: Milano
Default TEC S-15 amp (1961 !): main amp schematics

While browsing a rare - in my country, at least - 1962 issue of the Audio magazine, I've found an article about "High fidelity with transistors".
In a rather anonymous way, the third page carries the schematics of the main amp section of the TEC S-15 model.
This may say nothing to most of us, but this amp, released in 1961, was the first hifi stereo solid state amp ever sold in quantities.

Tec - or Transis-Tronics - was a small company located in 1601 Olympic Blvd, Santa Monica. The amp got a bad reputation for "burning" quite easily, and as it was sold with a 5 year guarantee, TEC went bankrupt very soon, and was included by Lafayette.

If I'm not mistaken, the configuration was that of a Quasi, no transformers, and this three years earlier than the Leak Stereo 30 !
What do you think of the schematics ? Was the complementary pair driven too hard ?
Thanks and my best wishes for the new year.
Attached Images
File Type: png SCAN0132a.png (48.4 KB, 154 views)
  Reply With Quote
Old 21st January 2012, 12:09 AM   #2
buckaroo is offline buckaroo
diyAudio Member
Join Date: Jan 2012
Thanks for posting the schematic info! I have three of these amps and only one works. I also have the matching FM-15MX FM multiplex tuner. The system actually sounds very good for no restoration. I've been looking for schematics for a long time.
  Reply With Quote
Old 4th March 2012, 10:48 AM   #3
Orit is offline Orit  Italy
diyAudio Member
Join Date: Feb 2007
Location: Milano
Default The S-25 was even earlier

I enjoyed very much the recent You Tube post about the S-15, thank you !
Another TEC model came even before, it was the S-25, though it seems it was not a quasi, but a more conservative transformer layout.

Here are the Audio report dated July 1960 and the back cover ad on the same issue.
Attached Images
File Type: jpg TEC_S25.jpg (154.3 KB, 65 views)
File Type: jpg TEC_S25_Test.JPG (255.3 KB, 61 views)
  Reply With Quote


TEC S-15 amp (1961 !): main amp schematicsHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: Geddes 15" waveguides, foamplugs, B&C DE250 drivers, HF filter & schematics anubisgrau Swap Meet 5 11th October 2011 09:29 PM
Rex Baldock Trike (Voigt pipes) HFN&RR 1961 DrBoar Full Range 1 9th March 2011 09:48 PM
Minimal AMP named C-TEC Stee Solid State 0 19th April 2007 08:44 PM
1 main amp, spare amp, 4 6x9's and a sub.....advice Ryancowe Car Audio 1 5th April 2004 02:52 PM

New To Site? Need Help?

All times are GMT. The time now is 04:51 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio