After some help from a local

[vkboy]

Hey guys im after someone in Melbourne who knows there way around an M70 as im needing a hand with getting mine sounding right, it was always abit scratchy when i got it, i got some cleaner/lubricant spray etc and it helped it abit but every now and then a channel drops out or just gets very scratchy and you can hardly hear it and the case is very rattly and horrible compared to my other boxes, i pulled the back off but can't find anything thats loose, its missing 2 top corner screws, the ones that screw into the handle brackets which im trying to find suitable screws for, but i can't find anything else loose inside.
Is there anybody i could get to give me a hand in sorting this one out? as i'd love to get this sounding 100% to go with it looking great
hit me up if you could help me
cheers.

 

[baddboybill]

Only recommendation is to ask Superduper about rebuilding sliders. He does a great job and sound is amazing and well worth money

 

[Northerner]

Sounds like it could be dodgy sliders as Bill says. I had the same problem with my m70

I stripped out the pcb with the sliders on then desoldered the offending slider. Then I tested the resistance using a multimeter and found it was knackered. Mind failed at one end of the strip so using some silver conductive paint the hairline crack was bridged and both channels working again Only issue is that the two channel volume levels are out of sync so you have to have the buttons at different points to get matching volume in both channels which is a bit irritating but better than only one channel

With hindsight I'd probably have asked superduper to do a proper rebuild to get it 100% but too late now

 

[Beosystem10]

It's a bit late to say this now I guess, but tracks with minor breaks can be sorted by rubbing a soft (2b or thereabouts) pencil across the break to fill it up with fresh carbon which, unlike electrocure paint, will maintain the correct value for the whole track. After you rub the pencil in, polish it level with a cotton bud that has a drop of carbon tetrachloride (Halfords contact spray as it has no lubricant in it) and when that evaporates off, the carbon that filled the break will be set in position.

I had this with most of the seven eq sliders on the Technics and solved the problem this way twice; once in 1987 when it was only five years old and once last year when it needed further attention. For any less intensively used box, the pencil treatment would probably last for ever.

 

[Northerner]

Yep waaaay too late Did try to get a salvaged slider but ended up with four M70 record level sliders but no volume slider

Will remember that trick for next time, thanks

 

[Lasonic TRC-920]

That pencil trick is a smart idea to keep in the back pocket. But like Bill said, contact Superduper and make arrangements. Norm rebuilt the sliders on my M70 and they are the sweetest controls of any of my radios. He has the correct parts and know how to do it right and you will never need it again.

 

[Beosystem10]

Fair comment and I certainly mean no disrespect to any poster or indeed to the guy whose expertise will undoubtedly provide the more elegant and durable solution.
My apologies for any inference to the effect that my way is in some way preferable to the correct replacement of worn parts. It isn't, but as an alternative to conductive paint, the pencil will win in a straight fight.

 

[Northerner]

Fair comment and I certainly mean no disrespect to any poster or indeed to the guy whose expertise will undoubtedly provide the more elegant and durable solution.
My apologies for any inference to the effect that my way is in some way preferable to the correct replacement of worn parts. It isn't, but as an alternative to conductive paint, the pencil will win in a straight fight.

I don't think there was any offence given or taken there mate...superduper is exactly as his name suggests, he really knows his electronics and is always there with helpful expert advice for the clueless like me but one of the best bits of this forum is the useful tips and advice from all of its members

 

[Beosystem10]

Amen to that mate. Good 'ere, innit!