Cleaning Switch in High-End Sony Preamp - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

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 24th November 2009, 09:29 PM   #1
diyAudio Member
Join Date: Jan 2004
Location: UK
Default Cleaning Switch in High-End Sony Preamp


I'm in the process of refurbishing a Sony TAE-88 preamp. It's a good example and just needs cleaning (I wonder if it was owned by a smoker...) and a re-cap / check of all caps / re-calibration. The switches are noisy, but they're very well-built (like the preamp in general) and I reckon they'll come up like new with a drop of Deoxit D5.

Has anyone here cleaned these switches before? I'm pretty sure I could just use a Deoxit pippet, gently dropping in solution and turning the switch. However, I'd like to know if there's an accepted standard for cleaning these switches out?

Thanks in advance.
Attached Images
File Type: jpg Resize Wizard-1.jpg (180.5 KB, 129 views)
  Reply With Quote
Old 30th November 2009, 11:48 AM   #2
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
Mooly's Avatar
Join Date: Sep 2007
They dont make them like that anymore

Switches... I would unsolder and put them in a container and flood them with WD40... which doesn't attack plastic and really work them hard to clean them up.

Depending on how experienced you are, did you know you can perfectly safely "wash" PCB's to bring them up as new. The only things to be careful of are coils (as in adjustable ones in tuners etc) and trimmer caps etc, "sealed" pots etc. Transistors, caps, IC's, all OK

I like to use foam cleaner and a brush, then rinse well in warm water and place in/on hot radiator or very low oven <45 degrees C to dry or use a hair dryer. Cleaned dozens of TV chassis this way that have been damaged by spillage etc ... even with the high voltage parts and done properly gives good result. They look brand new.
  Reply With Quote
Old 30th November 2009, 03:03 PM   #3
diyAudio Member
analog_sa's Avatar
Join Date: Aug 2002
Location: Cascais
Originally Posted by Mooly View Post

put them in a container and flood them with WD40

It will be much more difficult to remove the WD40 residue after this "cleaning"

Deoxit seems like a safe and easy choice.
  Reply With Quote
Old 30th November 2009, 05:34 PM   #4
diyAudio Member
Join Date: Jan 2004
Location: UK

Seeing as I couldn't find anything on the web, I had to figure this out for myself. The plan is to desolder them (I have a pair of vacuum desoldering machines) and bathe them in Deoxit. It's a huge job... You also have to note the cam positions before disassembly as the chance of reassembling everything in sync is equivalent to cracking an enigma machine. The manual lists tables to aid with this.

I've now cleaned out the attenuators and re-greased them with Faderlube - as well as a full re-cap of all electrolytics. Next step is to check ESR of all tants.

Interestingly, following electrolytic replacement, I can't measure undue offsets at the test points, which must be testament to Sony's design team and general component quality. Offset at the main O/P is under 10mV on one channel and near-zero on other. The resistors are pretty unusual: metal oxide film types. I shudder to think what a similar unit would cost to sell today...


Last edited by thermionic; 30th November 2009 at 05:38 PM.
  Reply With Quote


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
Sony TA-F7B cleaning tubee Solid State 7 31st August 2008 09:08 AM
Best way to switch high current supplies pjpoes Parts 4 9th August 2008 08:23 AM
Cleaning dirty tape monitor switch. darren.thomason Solid State 2 2nd June 2008 07:11 AM
switch-on, switch-off sequence for preamp/amp cbutterworth Tubes / Valves 1 2nd March 2007 12:41 PM
help cleaning up REALLY messy passive preamp bonsai171 Solid State 12 6th April 2004 06:44 PM

New To Site? Need Help?

All times are GMT. The time now is 08:13 AM.

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

Content Relevant URLs by vBSEO 3.3.2