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SANSUI EIGHT

JOMARK911

JOMARK911

Super Member
Bought it some years ago , was doing fine as a second or third office system.
Mostly on FM radio.
It has started to slip on the dial mechanism.
Yesterday opened it up , some cleaning on pots switches.
The tuning axle looks to slip on the cord. Have tighten the small elastic metal bar with the pulley in the back , but that does not solve the problem . Tried to fidlle with the spring in the fm pulley , no remedy there either.
If i help movement with my hand it's all good . But i can't have the receiver open to move the pulley by hand.
What is the remedy for this?
Thanks in avance.
 
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JOMARK911 said:
Bought it some years ago , was doing fine as a second or third office system.
Mostly on FM radio.
It has started to slip on the dial mechanism.
Yesterday opened it up , some cleaning on pots switches.
The tuning axle looks to slip on the cord. Have tighten the small elastic metal bar with the pulley in the back , but that does not solve the problem . Tried to fidlle with the spring in the fm pulley , no remedy there either.
If i help movement with my hand it's all good . But i can't have the receiver open to move the pulley by hand.
What is the remedy for this?
Thanks in avance.
Click to expand...

I had issues with a Sansui Six. Loaned it to a good friend. He was blind, so I knew what may happen. It did after he had it a year or so.

I ended up restringing it. Was a little tricky.
Took a few attempts. Getting the right length. And tying it off. Kept looking at another Six I had for reference.
Take pictures, before disassembly.
 
Hey guys thanks for the quick answers.
Moe i have cleaned the shaft with isopropyl alcohol , along with the string thoroughly. Didn't help.
As far as the rosin , i'm a bit reluctant , i've heard of rubing the string with wax , the one that they use in churhes. No good either.
I tried to insert a small piece of musking tape , and after that tried a cloth electric tape , still no success.
It needs a bit wider piece to be inserted . so it won't slip off by the string pressure. Looks the shaft is really slippery there. Polished through the use.
I'll see what i can do.
 
JOMARK911 said:
Hey guys thanks for the quick answers.
Moe i have cleaned the shaft with isopropyl alcohol , along with the string thoroughly. Didn't help.
As far as the rosin , i'm a bit reluctant , i've heard of rubing the string with wax , the one that they use in churhes. No good either.
I tried to insert a small piece of musking tape , and after that tried a cloth electric tape , still no success.
It needs a bit wider piece to be inserted . so it won't slip off by the string pressure. Looks the shaft is really slippery there. Polished through the use.
I'll see what i can do.
Click to expand...
Yes, I think you’ve hit it on the head, the shaft has probably become very smooth from years of a slight slip of the dial cord. I’ve used isopropyl alcohol with good results as you indicated, but if yours is still slipping, you may need to use a small piece of sand paper to “score” the shaft where the string comes in contact to make it less slippery.
 
There are the temporary fixes that include rosin to the string. The gears and shafts tend to get get gummy from age and adding IPA will clean them along with a drop of WD40, try working back and forth the stubborn areas.

Ultimately what's needed is a complete tear down, clean, lube and refit. I did this to a 2000A and it turns like a champ, next I'll tackle this on my own Eight.
 
Parts suppliers for old radio repair, such as Antique Radio Supply (no affiliation) sell dial cord dressing, a waxy stick, just for that purpose. It adds traction to the cord without get it too sticky, which can cause it to tangle where it wraps around the drive shaft part of the dial setup.
 
You can use a lit candle to drip candle wax on to a cotton ball and slide the cotton ball back and forth cleaning the string and making it sticky at the same time. Birthday cake candles work great....
 
Beeswax another..
But we must remember too that the cord is the weakest link and catution should be taken avoid replacement, unless necessary.
That's why I give the gears and rollers little cleaning first.
 
Hyperion said:
This stuff?
https://www.tubesandmore.com/products/belt-and-drive-non-slip-gc-electronics
Click to expand...
Hyperion said:
This stuff?
https://www.tubesandmore.com/products/belt-and-drive-non-slip-gc-electronics
Click to expand...

Nah, just for some twine wrapped around a reel.....????

Dang near nine bucks and that’s without tax and shipping !!!

Then you have to wait....

All yah have to do is realize which of your friends has got kids and call them on the phone as to where they get candles for their kids cake....jump in the car and be back in fifteen minutes with a small pack of candles and a small bag of cotton balls for the cost of chump change.

Then you don’t know whether or not the chemicals in that boom’n bottle are gonna eat out your frigg’n brains.
 
I need a permanent fix on this , not some temporal fixings.
I want to avoid restringing , so i 'm looking for the best result with the minor trouble.
I was thinking of removing the axle and treat it with a non slipery product , like rubber , or something like it with a long time frame.
Wax did not do anything. Tried it out. Axle is very thin, with only threads arround it. Need some material with more friction and high tolerance timewise. Like fluid rubber. Treat it a couple of times , let it dry and there i go.
 
JOMARK911 said:
I need a permanent fix on this , not some temporal fixings.
I want to avoid restringing , so i 'm looking for the best result with the minor trouble.
I was thinking of removing the axle and treat it with a non slipery product , like rubber , or something like it with a long time frame.
Wax did not do anything. Tried it out. Axle is very thin, with only threads arround it. Need some material with more friction and high tolerance timewise. Like fluid rubber. Treat it a couple of times , let it dry and there i go.
Click to expand...
Agree, it doesn’t make any sense to me to put wax on the dial string. Wax is a lubricant, and will make the string more slippery. If you want to clean the string you need to use a solvent on something to wipe the grime that might be making the string slippery. What I used with success on my QR-4500 that had a slipping string is to put some isopropyl alcohol on a q-tip. Clean all around the shaft while rotating the shaft. If you hold the q-tip on the shaft next to the string while rotating it all the way from one end to the other, you are also cleaning the string, and grime will transfer to the q-tip. You can do this several times using a clean q-tip each time. Let the string dry. It will tighten up as well after it dries as well. Just my experience. :thumbsup:
 
I have a G-4500 that was soaked in Deoxit. The dial cord slipped constantly. I had to remove it, and soak it in isopropyl alcohol overnight, then hang it up to dry. Had to clean the whole path with isopropyl alcohol. Restrung the cord, and it worked fine after.
But if you don’t want to remove the dial cord, anything you do will only be temporary.
 
Thanks KeithD thats what i did , qtip and clean as much as possible from the string.
It was almost clean .

The unit hasn't been soaked on deoxit ore some other oily lubricant.
 
I don't think it's a string issue more likely one of the componants is adding resistance,causing the string to slip probably due to being stood/dirty kept in one position on the dial.
Check any screws holding shafts i.e variable resistor and clean/lubricate any shafts/pulleys.
 
Yep, wax is slippery, I don't know why people suggest this. I have had to clean wax off quite a few slipping tuners.
You can however use rosin, as it is sticky, thats why its used on violin bows, creates resistance and so vibrates the string as you draw the bow across.
It does work on stubborn slipping tuner dial cords.
But it is worth checking all the little wheels and so forth are free and lubed. Little bit of machine oil, a little dab will do ya....
 
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Well i'll be taking eight to my friend ex sansui top engineer , to help me out .
I know string needs more tension , and the axle needs a bit of sanding.
We'll see.
 
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