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Old 24th January 2005, 05:35 AM   #1
diyAudio Member
Join Date: Jan 2005
Location: Marietta, GA
Default Tuner Mods - what caps where?

I have a Sansui TU-517 that I intend to modify. I can and have soldered small stuff since Boy Scouts - radio sets, amps etc, but really have been away from building anything electronic since.

I need a hobby so this is what I want to do, and learn while I'm at it.

Here is a link to a list of caps to replace and some directions from FMTunerInfo.com:
Tu-517/717 Mods

And here are links to Schematics:

Schematic - Left

Schmatic - Right

What I am hoping to learn is where it is best to use which caps (and why), and realize that there will probably be some discussion.

I am particularly concerned with the caps that need to fit on the 'problem board' - the one hard to remove-replace as they seem to need to be rather small for their value.

I actually have two 517's that I will mod and then work on a TU-9900, which I anticipate will be a bit tougher due to the op-amp instead of discrete structure of the 517.

I have never worked with IC's before other than to plug them into their sockets...

My System is an Acurus Act 3 7.1 Upgrade, OCM 500 Amp, Martin Logan Quests, Velodyne ULD-18 Crossed over @ 45HZ. I haven't built my HT room yet, so haven't filled out the rest of the system with ML's, just using Def Tech's and an Acurus 200X3 amp for center and surrounds - movies don't really count for me - stereo, and preferably analog does.

I think I should be able to hear differences - I was 20/20 on a blind test with an un-upgraded Act 3 in listening to CD's played through the digital connection.

Looking forward to any help you see fit to give - and thanks!

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