Sansui EIGHT

[sKiZo]

Like the WIMA on the power rail bypass ... I prefer a radial film cap, but those are much larger, and you're working in some tight spaces there.

What did you use to resize the new caps to the clamps? I've been using the black silicone automotive windshield rope. Just roll it to about the right diameter and press it in place to center and lock the cap in place, then press hard around the edge of the clamp to cut off any excess. Try it ... you'll like it!

PS ... 15 feet of silicone rope may seem a bit much, but I find it comes in handy for all sorts of stuff.

 

[Kale]

What did you use to resize the new caps to the clamps?

Are you asking for those two main capacitors or for that one 1000uf Nichicone capacitor?

 

[sKiZo]

Are you asking for those two main capacitors or for that one 1000uf Nichicone capacitor?

The single Nichicon ... looks to be some sort of closed cell foamlike for insulating windows? Always looking for new options.

PS ... not to derail, but I do miss the old terminal tab caps for power rails. A lot of them are those silly snap terminals now. One shortcut that makes it a whole lot easier is to just snip the spades off the old cans and solder those to the snap terminals on the new cans.

No desoldering, rewrapping, and hoping the wires are still long enough.

 

[smurfer77]

 

[Kale]

PS ... not to derail, but I do miss the old terminal tab caps for power rails. A lot of them are those silly snap terminals now. One shortcut that makes it a whole lot easier is to just snip the spades off the old cans and solder those to the snap terminals on the new cans.

No desoldering, rewrapping, and hoping the wires are still long enough.

That is very good idea!!

 

[Kale]

I made a short video about dual function of Tuning meter; I was wondering why balance potentiometer doesnt has central click, but now... really I like this how Sansui made that balance channel check... look:

 

[Ronito6]

I made a short video about dual function of Tuning meter; I was wondering why balance potentiometer doesnt has central click, but now... really I like this how Sansui made that balance channel check... look:

Wow. It balanced itself like magic. Nice.

 

[Kale]

One more interesting thing... not so good... if you are using Loudness Control on high levels, because volume potentiometer doesn’t has Loudness control pin, that function could be very dangerous for yours speakers (especially tweeters), because over 10kHz Loudness filter boost very high frequencies, look what I have measured at speakers output at the same volume position:
10kHz -> 5V
20kHz -> 7V
40kHz -> 8.5V

 

[sKiZo]

Yup ... loudness does have it's disadvantages, but ... used only when needed at lower volumes, can be nice. I prefer a software approach here, at least with the digital sources, using that fancy new ISO 226:2003 ... jRiver Media Center has a variable loudness built in that changes based on the output levels. Fletcher Munson is so ... yesterday. <G>

Speaking of tone ... do the tone controls affect the center reading on the meter? I was surprised to see it doesn't have split controls to adjust tone on each channel ... maybe your next mod ... nudge nudge ...

 

[LBPete]

I'll be damned. Never knew about that balance feature. It's amazing. Thanks for posting.

- Pete

 

[Oldsansui441]

Absolutely terrific work, can see you have spent many, many hours on this beautiful receiver .

 

[Kale]

Another thing what I like on this receiver is voltage selector!
In the most Sansui models you can find multivoltage main transformers, so because of that Sansui units were imported from States to Europe so much times (you don’t need step-down transformer from 110V AC to Europe 230V AC), but here on Sansui Eight we have better solution!
You can chose from voltages, 100V AC – 110V AC – 117V AC – 127V AC – 220V AC – 230V AC – 240V AC – 250V AC , 8 specific primary voltages!!!!
Really fantastic!!!

Someone has changed those input transistors just on this driver board

But he did that job not so nice….

I replaced those input transistors on the both channels with Toshiba 2SA970 and fixed this

 

[The Fuxtor]

Another thing what I like on this receiver is voltage selector!
In the most Sansui models you can find multivoltage main transformers, so because of that Sansui units were imported from States to Europe so much times (you don’t need step-down transformer from 110V AC to Europe 230V AC), but here on Sansui Eight we have better solution!
You can chose from voltages, 100V AC – 110V AC – 117V AC – 127V AC – 220V AC – 230V AC – 240V AC – 250V AC , 8 specific primary voltages!!!!
Really fantastic!!!

Someone has changed those input transistors just on this driver board

But he did that job not so nice….

I replaced those input transistors on the both channels with Toshiba 2SA970 and fixed this

How did you go about fixing the missing pads there?? Looks fantastic!!

 

[sKiZo]

Looks like you wouldn't really need a pad there ... just bridge the leads and solder away ...

 

[The Fuxtor]

Looks like you wouldn't really need a pad there ... just bridge the leads and solder away ...

Looks to me like an insert is underneath? Reading the other Kale posts would leave me to believe that he went above and beyond to repair this issue like the pro he is!
Actually the original repair wasn't half bad if all the flux would have been cleaned up! Seen a lot worse.....

 

[ghazzer]

There are ways to repair/replace a pad with eyelets, if you can find ones small enough. Replacing tracks is more difficult, and often accomplished by bridging two points with a piece of small solid wire or component lead.

 

[Kale]

I am sorry for late answer, so about making those missing pads; I have a few different sizes of copper self-adhesive foil

And by this tool, I can make those missing pads

So… this solution was electrically good

But the final result is electrically and visually good

 

[Kale]

I decided to change those two trimmers on Driver boards

other two, I cleaned at ultrasonic cleaner, but those two replaced, after cleaning in ultrasonic cleaner was not in specification range, so I replaced them by Bourns muliturn trimmers.

 

[Kale]

and some final pictures....

 

[stereofun]

Work of art - machine as well as it's restoration.