Thorens TD125 Mk II- totally dead - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

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 31st October 2007, 02:20 PM   #1
diyAudio Member
 
Join Date: Oct 2007
Default Thorens TD125 Mk II- totally dead

Need Help!

I turned my Thorens on after 10 years sitting in the basement (never used it after I moved 10 years ago); and it won't turn.

Found the service manual on the Net.

Found the following:

Phase I voltage measurements: between RT and GE, 3.8V AC regardless whether on 16, 33, or 45 RPM position

Phase II voltage measurements: between BL and GE, 0 volts regardless whether on 16, 33, or 45 position.

Doe this mean one of the Ua709 op amps is dead? If so, which one?

Does anyone know the theory of the op amp operation? does each op amp generate 1/2 of the voltage required by the motor? Is each op amp a Wien Bridge oscillator?

Also, should I change all the capacitors on the board, or just the two big electrolytics on the power supply (1000uF 25V)?

Last question: where can I buy a 709 op amp in Toronto, Ontario, Canada?

Thanks

Ken
  Reply With Quote
Old 31st October 2007, 02:25 PM   #2
diyAudio Member
 
Join Date: Feb 2006
Location: Willy, VIC
Try here:

A Page on TD125 drives

Any further questions just ask.
  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
Thorens TD125 Power Transfomer gcalvas Analogue Source 7 28th July 2013 11:00 PM
thorens TD125 arm board made VanguardVillage Analogue Source 2 21st April 2009 03:23 AM
Thorens TD125 mods AuroraB Analogue Source 4 6th November 2006 08:04 AM
WANTED: Thorens TD125 MKII Armboard cut for SME needlenose Swap Meet 1 16th March 2005 06:52 AM


New To Site? Need Help?

All times are GMT. The time now is 02:50 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