Thorens TEM 3200 clone - Page 5 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 28th June 2012, 09:21 PM   #41
Banned
 
Join Date: Sep 2005
Send a message via MSN to audiodesign Send a message via Skype™ to audiodesign
Opened a webpage about this project.

DC coupled Hi-end Hybrid Amplifier

In the listening test with some my friends were overcome a lot of the performance of my previous End Amplifier

Amplifier End by Andrea Ciuffoli
  Reply With Quote
Old 29th June 2012, 05:43 AM   #42
Banned
 
Join Date: Sep 2005
Send a message via MSN to audiodesign Send a message via Skype™ to audiodesign
No ideas has been received about the original clone so this thread can be closed.

The developments on my new Circlotron project will be described in the relative web page on my web site.
  Reply With Quote
Old 22nd December 2012, 08:12 PM   #43
Klick is offline Klick  Germany
diyAudio Member
 
Join Date: Dec 2005
Location: HEF
I have a quick and dirty concept how the tube-part perhaps can be built
TEM-Konzept01.jpg

after tube2 is a Resistor as Levelshifter.
  Reply With Quote
Old 30th November 2013, 12:32 AM   #44
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Default TEM 3200 in used condition anywhere available ?

I am looking for an used TEM 3200 in perfect or faulty condition.
Who know, who may offer such a device?

Thank you for advices.

And a second question:
Who can upload a schematic diagram from this model ?

Last edited by tiefbassuebertr; 30th November 2013 at 12:34 AM.
  Reply With Quote
Old 2nd December 2013, 03:23 AM   #45
ilimzn is offline ilimzn  Croatia
diyAudio Member
 
Join Date: Feb 2005
Location: Zagreb
Trivial problem, feedback has to go from the other side of the circlotron. However, the phase then relies on the input transformer to do correct phase splitting. Otherwise, your input stage (1st) must be set up as a differential amplifier so it does the phase splitting itself. Feedback can still be connected to the 1st stage cathodes, but I'll leave it to you to figure it out, it's not too difficult
  Reply With Quote
Old 2nd September 2015, 02:49 PM   #46
diyAudio Member
 
Join Date: Jun 2004
Location: France
HI

A full solid state version is possible ?
  Reply With Quote
Old 2nd September 2015, 04:49 PM   #47
diyAudio Member
 
smoking-amp's Avatar
 
Join Date: Dec 2001
Location: Hickory, NC
Looks like all the circuit ramblings have missed the obvious TEM3200 front end design.

The EC86 and CV6189 are both hi gm tubes. So use them together as an asymmetric differential pair (a separate pair on each phase side). Input goes to the EC86 grid, and N Fdbk goes to the CV6189 grid. CCS tails for each side (notice -Ub for each side). Plate of the CV6189 drives the 6S3P cathode follower grid.

Edit:
Looks like the 6S3P is the input, and the CV6189 is the 2nd half of the diffl pair, with the EC86 as the follower here: http://www.6moons.com/audioreviews/thorens/thorens.html

Essentially a tube Op-Amp version of the SUMO9+
Attached Images
File Type: gif TEM3200.gif (18.3 KB, 122 views)
__________________
If it isn't broken, take it apart and mod it. And then, what is the "speed of dark"? Hint: plug it in to find out.

Last edited by smoking-amp; 2nd September 2015 at 05:17 PM.
  Reply With Quote
Old 7th September 2015, 11:57 AM   #48
diyAudio Member
 
Join Date: Jun 2004
Location: France
Hello, I simulated the patent with OPAMP :

0.001% 10khz 1W 8ohm (4V)
0.02% 10khz 120W 4ohm (31V)

https://sites.google.com/site/solidc.../OPAtriple.asc
Click the image to open in full size.



I tried with a follower but it does not work

https://sites.google.com/site/solidc...oOpaBuffer.asc
Click the image to open in full size.
  Reply With Quote
Old 7th September 2015, 02:59 PM   #49
diyAudio Member
 
smoking-amp's Avatar
 
Join Date: Dec 2001
Location: Hickory, NC
What is the problem with the buffered version? Oscillating? Maybe need fast Fet buffers.

------------------

On the tube version:

"Uniquely, the Thorens then adds a 6-tube input/driver stage with complete DC coupling from input to output to avoid any and all coupling caps."

"Just as Bongiorno's patent concerned itself with how to bias the floating counter phase circuits, so the secret of the Thorens lies in its three potted modules. They perform the precision servo biasing so critical to a high-power output stage that's not referenced to ground."

---

The 6S3P input gets cathode coupled to the CV6189 with a CCS tail.
Then probably has Gyrator loads on the CV6189/6688/E180F pentodes to control DC levels to the EC86 followers, and to provide high AC gain from the CV6189 pentode plate, to resemble an Op Amp. Then probably a bias servo on the final CCS tail for the EC86 buffers to control Mosfet bias. (making for three potted modules) (an additional resistor between the EC86 cathode and the Mosfet gate feed, so the controlled CCS can vary bias) The 300 Amp output module Mosfets are trivially loaded by a speaker load, so have virtually no distortion to begin with for the Op Amps to fix. Hence the super low distortion figures.

This should really be a simple design to make DIY. I would suggest just using $1 6JC6 frame grid tubes for all the tubes (possibly use 12GN7 or 12HL7 tubes for the followers). A $200 Amp to build from parts (mainly power supply, input xfmr, and Mosfets).
Attached Images
File Type: gif TEM3200_block_diag.gif (90.0 KB, 79 views)
File Type: gif TEM3200.gif (18.3 KB, 79 views)
__________________
If it isn't broken, take it apart and mod it. And then, what is the "speed of dark"? Hint: plug it in to find out.

Last edited by smoking-amp; 7th September 2015 at 03:26 PM.
  Reply With Quote
Old 7th September 2015, 03:51 PM   #50
diyAudio Member
 
smoking-amp's Avatar
 
Join Date: Dec 2001
Location: Hickory, NC
late edit:

Mosfet modules with a built in thermal monitoring diode or thermistor would be preferred, for fast control of the variable bias CCS.


The low distortion figures do mean that this doesn't sound like a tube amp, by the way.
__________________
If it isn't broken, take it apart and mod it. And then, what is the "speed of dark"? Hint: plug it in to find out.

Last edited by smoking-amp; 7th September 2015 at 03:57 PM.
  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
Cloning a $3200 Speaker for $400 Patrick Bateman Multi-Way 95 6th February 2016 07:38 PM
Krohn-Hite 3202(R) and 3200(R) Filter jackinnj Equipment & Tools 5 23rd June 2010 11:18 AM
Problem With Denon Avr 3200 ostie01 Solid State 4 21st July 2005 08:38 PM


New To Site? Need Help?

All times are GMT. The time now is 01:01 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki