[sdiy] Matrix-12

[harrybissell]

The transformers are no good on 60Hz either....  I understand that not
ALL units hum, but most do,  I'd take the transformer out and mount it in a
separate
box... with a long cord. Maybe put it in the next room ???

Of course on stage the guitarist or durmmer will ensure that you cannot hear
the hum...

H^) harry

jhaible wrote:

> > It turns out it really is without the Aftertouch option, and has a
> > preliminary manual that says I can get a retrofit at no charge in
> > spring 1985. It also has a registration card to order the final manual.
> > I suppose both vouchers are not valid anymore unfortunately. Again, I'd
> > be willing to change the keyboard assembly myself if someone could tell
> > me which type of keyboard works and what, if any, adaptations need to
> > be done to connect it to the Matrix-12.
>
> I'll answer even though I'm not sure if it is of much value - I'll give
> you all I remember. (;->)
>
> I have added an aftertouch function to an Ensoniq ESQ-1. This was
> many years ago, but certainly long after 1985. The German distributor
> for Ensoniq back then was also the distributor for Oberheim -
> this *might* have been Waldorf (TSI ?), and they offered me
> a Matrix-12 aftertouch sensor for free. Apparently they had a lot of
> these left. In the end I used a Kawai sensor, and I'm sure I don't
> have the Oberheim sensor anymore (not after moving houses).
> But maybe the clue to Waldorf may help.
>
> > Additionally, the mains transformer hums badly. Anyone knows if I can
> > get a replacement power supply or what are the specs for it?
>
> This hum is outright terrible. The main reason for me not to buy an
> Xpander. May be ok at a 60Hz mains, but at 50Hz and increased
> voltage (200V -> 230V  --- soon 240V ?) these transformers are
> way under sized. Good luck finding one that fits - I guess the nice
> display needs some extra windings with higher voltage than usual.
> (Just a guess.)
> You might try a step down transformer (like 230V -> 220V or
> even lower), but then of course you're loosing "headroom"
> for mains under voltage. (Or would that be "foot room"?)
>
> JH.