Discussion about the Korg PolySix synthesizer

hello guys,

i'm trying to modify a p6 so that it is no longer 110 v as for US but 220 without using a step down convertor or anything like that.

so i know i need a transformer with two secondaries. does anybody know what is the output AC voltage of the original p6 transformer ? 30 v ?

thanks
razvan

hello ,

I have replaced a transformer on my Polysix, and I put a Velleman 5024, it's a TOROIDAL TRANSFORMER(less magnetic loss) 220 V / 2x24V and it works very well !...you can put a classic TRANSFORMER 2x24v

http://www.velleman.eu/products/view/?id=1923

Raf

--- In PolySix@yahoogroups.com, "arpm234" wrote:
>
> hello guys,
>
> i'm trying to modify a p6 so that it is no longer 110 v as for US but 220 without using a step down convertor or anything like that.
>
> so i know i need a transformer with two secondaries. does anybody know what is the output AC voltage of the original p6 transformer ? 30 v ?
>
> thanks
> razvan
>

cool. thanks 




________________________________
From: rafeek.2010 <rafeek.2010@yahoo.com>
To: PolySix@yahoogroups.com
Sent: Thursday, February 14, 2013 10:20 PM
Subject: [PolySix] Re: p6 power supply transformer


 
hello ,

I have replaced a transformer on my Polysix, and I put a Velleman 5024, it's a TOROIDAL TRANSFORMER(less magnetic loss) 220 V / 2x24V and it works very well !...you can put a classic TRANSFORMER 2x24v

http://www.velleman.eu/products/view/?id=1923

Raf

--- In PolySix@yahoogroups.com, "arpm234" wrote:
>
> hello guys,
>
> i'm trying to modify a p6 so that it is no longer 110 v as for US but 220 without using a step down convertor or anything like that.
>
> so i know i need a transformer with two secondaries. does anybody know what is the output AC voltage of the original p6 transformer ? 30 v ?
>
> thanks
> razvan
>




[Non-text portions of this message have been removed]

I use 50VA 2 x 15V toroids from Vigortronix.

http://uk.farnell.com/jsp/search/productdetail.jsp?SKU=1675058

Easily enough overhead to work at 220V. If that makes you nervous,
particularly if your line voltage frequently falls below 220V, then use
a 2 x 18V.

A 2 x 24V transformer will work but will cause the power supply to
generate a lot of heat which will need to be dissipated by the rear panel.

Also, virtually every Polysix and Mono/poly I have seen has a blown
'spark killer' capacitor on the mains in board. Remove it and don't
bother replacing it.

Tony

http://takla-makan.bandcamp.com/
http://www.oakleysound.com

Which reminds me...

Almost every Polysix and Mono/poly I find here in the UK needs a new
transformer. The old ones become lossy and generate a lot of excess
heat. It will take it hours to warm up but it will and if left on will
cause enough heat to warp the patch button PCB. If your patch buttons
sag in the middle section your transformer is probably getting too hot.

This may well be just a UK thing since we typically use 240V which does
have a tendency to push old and cheap transformers to their limit.

Tony

http://takla-makan.bandcamp.com/
http://www.oakleysound.com

Thanks mate,

I've tried a tirodial one  220v to 2 x 24v but it makes the output be very noisy.
Noise from the mains ofcourse, so i decided to put back the 100 v
transformer and use a step down converter.

Will so how this works. If still with troubles, I'll try out your
suggestion.

So thanks a lot.

Razvan




________________________________
From: Oakley Sound <oakleylist@btinternet.com>
To: PolySix@yahoogroups.com
Sent: Monday, February 18, 2013 11:32 AM
Subject: Re: [PolySix] p6 power supply transformer


 
Which reminds me...

Almost every Polysix and Mono/poly I find here in the UK needs a new
transformer. The old ones become lossy and generate a lot of excess
heat. It will take it hours to warm up but it will and if left on will
cause enough heat to warp the patch button PCB. If your patch buttons
sag in the middle section your transformer is probably getting too hot.

This may well be just a UK thing since we typically use 240V which does
have a tendency to push old and cheap transformers to their limit.

Tony

http://takla-makan.bandcamp.com/
http://www.oakleysound.com



[Non-text portions of this message have been removed]