converting an old synth main power from 110v to 220v

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syevad
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converting an old synth main power from 110v to 220v

Post by syevad » Sat Sep 05, 2020 4:16 pm

I've just bought a SC Six Trak from the USA (I'm in the UK).
I'm still testing the Six Trak and checked the voltage coming from the 110v transformer - from the 3 wires (black, red and white) the reading are 9v, 9v and 18v (approx.).
If all ithat s required, is to reproduce theses same readings (voltages and current) from a 220v transformer - shall we assume everything should be fine and can get rid of the step up transformer? (which is bulky and noisy too)....and find a suitable 220v transformer?

If not, I'm sure there are ways to convert the power circuitry to allow the main power of 220v to be used directly without the need of a step up transformer...any idea what are the costs to hire an electronic enginieer to do this job?

thanks.

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meatballfulton
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Re: converting an old synth main power from 110v to 220v

Post by meatballfulton » Sat Sep 05, 2020 8:03 pm

Yes, a 220V transformer with the same specifications for the secondary voltages will work. Any good technician would be able to do the work assuming the right transformer can be located.
I listened to Hatfield and the North at Rainbow. They were very wonderful and they made my heart a prisoner.

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Re: converting an old synth main power from 110v to 220v

Post by syevad » Sun Sep 06, 2020 10:42 am

meatballfulton wrote:
Sat Sep 05, 2020 8:03 pm
Yes, a 220V transformer with the same specifications for the secondary voltages will work. Any good technician would be able to do the work assuming the right transformer can be located.
thanks for your feedback...
basically it's just about finding a 220v transformer for a Six Trak? No other changes in the circuitry?

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Re: converting an old synth main power from 110v to 220v

Post by meatballfulton » Sun Sep 06, 2020 2:25 pm

I mentioned the service manual in your other post. It includes schematics and you can see that there is very little involved on the primary side of the transformer, just the power switch and a fuse. You will of course need to replace the power cord, too.

Contact Wine Country who are a Sequential repair business about the transformer. They list them as available for $8 USD, of course they don't mention if they have all three versions (USA, Japam, European) available but they can probably steer you in the right direction.
I listened to Hatfield and the North at Rainbow. They were very wonderful and they made my heart a prisoner.

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Re: converting an old synth main power from 110v to 220v

Post by syevad » Sun Sep 06, 2020 2:54 pm

very useful link, thanks

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Re: converting an old synth main power from 110v to 220v

Post by Jericho » Wed Sep 09, 2020 5:35 pm


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Re: converting an old synth main power from 110v to 220v

Post by syevad » Wed Sep 09, 2020 10:26 pm

That video put me off initially...but looking at the service manual of the Six Trak we can see the circuitry of the power supply is much simpler. Also, the problem with the Yamaha is a lot more complex...
I've managed to gather some useful hints and confident the simple swap of transformer + fuse is going to work...I'll keep checking voltages and amperages and let you all know.

Possible outcomes:
1) get rid of that ugly step down transformer (noisy and heavy).
2) burn the circuitry of my beloved Six Trak!!

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Re: converting an old synth main power from 110v to 220v

Post by syevad » Sun Sep 20, 2020 12:33 am

Done!!
at last...I've received the 220v transformer and swapped it for the 115v - it works perfectly - very little involved...in fact both switches and fuses are exactly the same on both versions (115v and 220v).
Now the recording area is quieter and good riddance of that ugly and heavy wall wart too.

In practice one can ask to swap the transformer with someone in the USA or Japan who probably have the european version (or viceversa).

Finally, I've also modded the main cable and installed a socket so the cable can be plugged and unplugged as necessary - neat and tidy...I can move the ST easily without risking to stumble on that dangling cable.
If anyone is interested, the most risky move was to make a rectangular hole in the metal casing - the usual methods are drilling holes and then file and file and file for hours...well, there is a new and better way: there are these new tungsten carbide rotary drill bits which are the best find in a decade (in my case)...the square hole was done in 5 minutes (and a very neat job too).

Now, for that 6 outputs mod - anyone? (that deserves a new thread).

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Re: converting an old synth main power from 110v to 220v

Post by rschnier » Sun Sep 20, 2020 7:44 pm

Glad it all worked out!
-- R.

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Re: converting an old synth main power from 110v to 220v

Post by madtheory » Wed Sep 23, 2020 2:24 pm

syevad wrote:
Sun Sep 20, 2020 12:33 am
In practice one can ask to swap the transformer with someone in the USA or Japan who probably have the european version (or viceversa).
That's a very good idea!

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Re: converting an old synth main power from 110v to 220v

Post by syevad » Mon Sep 28, 2020 11:16 pm

btw - I have a spare 110v transformer + fuse + switch perfectly working for any Six Trak user in USA or Japan (and "115v" sticker too - which doesn't fit mine anymore ;) )....just send me a quick message and I'll post for a small charge and postage.

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