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 27th April 2004, 10:01 PM   #1
diyAudio Member
 
Jeff Wong's Avatar
 
Join Date: Apr 2004
Location: New York
Default Sansui TU-717 Mods

Hi, I've been lurking here for a bit, and finally figured that I should dive in with a post. I'm impressed with the dedication all of you have. I hope I can eventually free up some time to devote to DIY projects, and maybe read the Horowitz and Hill book I bought at Mike Creek's recommendation half a dozen years ago.

I got into High End Audio in 1995 via my ex-girlfriend's Dad, who was an audiophile. My brother gave me his Sansui TU-717 Tuner a number of years ago, to which I added an IEC jack in order to use some aftermarket power cords with the unit. This tuner is one of the few things that I haven't had a chance to take a soldering iron to, other than for the IEC jack. I always thought it might be nice to replace the carbon resistors with metal film ones to lower the noise floor. But, I only recently found a schematic online; the collector in me would prefer an original, but, the practical side of me is glad to have gotten anything at all. My DIY skills and experience are limited; I've generally only done parts swaps, and no circuit design. So, please bear with this neophyte.

When I had the hood open a few years ago, I recall that there were some 8 pin chips in the Sansui TU-717. I believe the part is an RF/IF Amplifier - LA1222 (its equivalent is an ECG1227.) Does anybody know of a higher quality version (preferably a drop in replacement), perhaps made by Burr Brown or Analog Devices? Would there be any benefit to replacing this part? I've used Burr Brown Op Amps as replacements for I/V conversion in many of my other components with very good results. I have no idea if upgrading an RF/IF Amplifier will reap any sonic benefits.

I was wondering if I might be able to do a quick swap in the TU-717 in the short term before performing any major surgery on the unit. I can imagine replacing all of the resistors, maybe getting some Murata ceramic filters and popping those in, and upgrading several (if not all) of the electrolytic capacitors. I've got a list of the caps that someone else has replaced in the TU-717 with supposedly good results. At some point in the future, I'll do this with something suitable like Black Gates.

Has anyone here modified a TU-717? If so, what parts substitutions offered the most significant improvements?

Any information would be greatly appreciated.
__________________
Caricature Portfolio
  Reply With Quote
Old 28th April 2004, 09:43 AM   #2
diyAudio Member
 
Frank Berry's Avatar
 
Join Date: Sep 2003
Location: Midland, Michigan
This site might give you some useful information.

http://www.fmtunerinfo.com/
__________________
Frank
  Reply With Quote
Old 28th April 2004, 03:58 PM   #3
diyAudio Member
 
Jeff Wong's Avatar
 
Join Date: Apr 2004
Location: New York
Thanks, Frank. I've gathered some useful info from a number of places, including that one. I've now got a list of capacitors that can be replaced that should provide better sound. I've been advised to avoid changing the RF/IF LA1222 chips. Hopefully, I will eventually get some free time to mod this unit.
__________________
Caricature Portfolio
  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
Sansui TU-9900 Restoration and Mods Algar_emi Solid State 48 27th October 2010 02:11 AM
need help with sansui AU 220 qrius4ever Solid State 2 18th July 2009 05:14 PM
Sansui xr q9 nik75 Digital Source 0 14th June 2009 10:12 PM
FM tuner mods for the Sansui TU-717 and TU-517 3moons Analogue Source 0 22nd December 2004 05:11 AM
old sansui cd player mods sss Digital Source 3 19th September 2004 03:04 AM


New To Site? Need Help?

All times are GMT. The time now is 01:53 AM.


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