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The ETI/Maplin Update

Posted: Mon Aug 13, 2007 12:58 am
by Arddhu
Just got my 4600 today.

I think I've got some work ahead of me. I think it's been sitting in the bloke's garage for about 20 years and it sounds like it too.

From what I can tell, the keyboard doesn't track, the mixers now change the pitch of the oscillators, a couple of the oscs act as lfos even when they're selected as normal oscs etc etc. But the spring reverb works perfectly!

Hmmm. Could I have bitten off more than I can chew?

Any tips for general synth repair? I think I'll start with a can of contact cleaner and a duster.

Posted: Mon Aug 13, 2007 1:11 am
by Bitexion
Hehe, good luck. As if it wasn't bad enough being hand-built 25 years ago, it's also been sitting in a garage. You probably need to replace every capacitator and who knows what else. Vintage synths can be very little fun to deal with.

Posted: Mon Aug 13, 2007 1:14 am
Yeah, I would go through it and re-cap it and check all of the solder joints first. I don't know how hard they are to locate, but you probably want to try to locate the schematics for troubleshooting purposes too.

Posted: Mon Aug 13, 2007 1:18 am
by Arddhu
I think I was reading also that the Maplins were digital/analogue hybrids; such as the keyboards were digitally controlled as was something else, though it escapes me at the moment.
Should make things more interesting.

Posted: Fri Aug 17, 2007 6:59 am
by Arddhu
OK. I started the cleaning job today. Just working all the pots and cleaning as much of the exterior grime I could get to.

Also had an electronics guru look it over and he agrees testing the caps and replacing the dead ones but the verdict is she's all put together really well!! Hurrah!

Only problem now is the sticky keys. Waiting 30 seconds for some of them to pop back up after you hit them seems a bit much.

Posted: Fri Aug 17, 2007 11:32 am
by Bitexion
Have him check if you got spiders in the spring reverb box :) Maybe it's the spiders tingling instead of the springs.

Posted: Fri Aug 17, 2007 1:05 pm
by Arddhu
:D Will do!

Posted: Tue Aug 21, 2007 4:23 pm
by gojira
Any photos? :D

Good luck with the restoration.

P.S. You from Tassy Arddhu?

Posted: Tue Aug 21, 2007 4:29 pm
by Arddhu
I don't have a camera at the moment so I've only got the photos that the bloke selling it had.
She is one big beast though, 25 kg of modular love!



Yeah, I'm in Launceston actually. Don't tell me there's actually more than two synth nuts in Tassie?

Posted: Wed Aug 22, 2007 8:03 am
by Bitexion
She's pretty. But you might wanna consider using another picture upload site. This one spams with popups about poker websites, and even a "Do you wanna win $150? Yes/No" box when you close it.

Might be due to the fact that I'm browsing on a PC at work that might be full of spyware, but...check it.

Posted: Wed Aug 22, 2007 8:17 am
by Arddhu
Oops. :oops: Sorry about that.

What's a better one to use?

Latest development is I'm thinking about getting new wood ends made for the beast as these old ones are pretty chipped. Shouldn't be too hard I imagine.

Posted: Wed Aug 22, 2007 9:26 am
by gojira
Nope, not in Tassie, I'm in Melbourne.

Its been long since I've seen any nice vintage synths come up for sale in Australia. I almost got myself a Jupiter 8 w/ Encore midi for $1650 AUD but the guy bailed on the deal the day I was to pick it up. Was a while ago though.

Again, best of luck with the restoration :D

Re: The ETI/Maplin Update

Posted: Fri May 04, 2012 7:31 am
by Arddhu
Well this has been a while since updates! Five years later and here's some new photos. :? ... /lightbox/

I might be actually able to work on it now after 2 years in the repair shop. I'd forgotten how massive the thing is!
It seems the knobs have all been relegated to the murky depths of Launceston so now I have to hunt down 4000 1/4" D shaft set-screw knobs. If anyone has any recommendations that would be most swell.
However the priority is still fixing up the PSU.

Fun fun!

Re: The ETI/Maplin Update

Posted: Fri May 04, 2012 8:51 am
by synthparts
Looks nice, good luck with it. I have a Maplin 5600S which was an updated 4600 that I need to work on myself...

Re: The ETI/Maplin Update

Posted: Fri May 04, 2012 9:26 am
by Hybrid88
Awesome it's back! :D

Well the P/S shouldn't be hard, just need to replace the main capacitors, regulators, get a multimeter, test and calibrate it to what it should be. ;)

hmm, if I was you I'd have another hunt for those knobs, I make it at 82? you need. Say you get 82 of these... ... rm=KEYWORD

That'll cost you $98.40, a tidy sum for just a few knobs. Something to consider.