problem w/ power supply

[mtwallet]

here's what I received yesterday

a fabulous Philicorda GM 752

unfortunately, I have no power cable
and the female plug is kinda weird
it looks like that

do you have any idea where I can find some? or what I can do with that?
thanks!

[mtwallet]

ok, I used a PC power cable like this

I removed the "land" wire, turned one of the 2 other so it's horizontal
and it works!
and all the keys of the organ work!
great day!

[mtwallet]

I got a problem with my Eko Tiger ; I got a buzz when I turn it on
all I know it's not because of the speaker ; I have the same problem when I use the earphone output

I think it's a problem of power supply or earth wire or something like that
here's the plug



I think it's related with another problem: when I plug a volume pedal between the organ and the amplifier, it's got that loud sound when I just "touch" the pedal ; so loud I have to remove the pedal

I sometimes had the same problem with my Farfisa Matador, when I put the volume quite high (i.e. in big show rooms)
but I hadn't no earth wire in the farfisa power supply


do/did you have the same problem?

I'm thinking about buying some cheap guitar noise reduction by Behringer NR 100... but I don't know if it's gonna work...

[karl]

Hey There mtwallet,

My first guess with a loud buzz is usually the large electrolytic capacitors in the power supply. If these go, AC Hum will get into the audio. They usually open up when they fail. So, get a large High Voltage, ( at least as large as the one in there usually like 100WVDC or so) capacitor, about 1000 uF and just use clip leads to connect it across one in the power supply. Be careful to observe polarity. ( + to + and - to -) If you hook it up backwards
it can explode! If this takes care of the Buzz then Replace the cap. If this does not fix the problem email back and we can go from there. Please be careful, this is one of the places where you
can get electrocuted.

Good Luck

Karl

[mtwallet]

thanks for your great reply again!
I'll take some pics tomorrow and post them
I can see 2 of them electrolytic capacitors
cheers

[Time Lord]

Flo,
I asked in your other thread about your mains voltage in France. Are you 220 or 110?

[mtwallet]

it's 220 in France ; here's an old pic (I'll take a better one later)
hiddenpage.free.fr/Tiger/_1013972.JPG
in the upper left, I got 2 big grey condensators 2000uf (the polarity is written on it, so I don't worry)
it seems, that there's another orange condensator
so I don't know the one I gotta change ; I suppose it don't cost much...
I wrote a loud buzz, but it's more a "breath" sound ; it's bearable at low volume, but very annoying during rehearsals

[karl]

Hi Mt,
If you have a "hiss" problem it's probably not the power supply caps. Although they look very old. And yes, they are kinda expensive. You may not even be able to find exact replacements.

The Hiss problem could be just part of the original circuit. One problem with the older gear is that they tend to be very noisy compared to newer stuff. These days the modern amp/speaker stuff is very quiet and all of a sudden you notice what never used to be a problem. A noise gate found in most compressors can help a lot. The only problem is if you have reverb in the organ this can cut off the tail of the verb. If this is the case put the verb after the noise gate.

If your hiss problem has just shown up look for a broken ground connection. Also fluorescent lights can cause this problem. ( ask a guitar player, they hate fluorescents).

Keep Me Posted
Karl

[mtwallet]

Well, a friend of mine told me it must be the condensators too...
this problem has always been ; it didn't show up these past few days
but since I use that organ in rehearsal, it's becoming very annoying...
and I got no reverb in it

[mtwallet]

yesterday, I called for 2 condensators (to replace the 2 grey ones) (2000uf/25V) and I've been told it don't exist anymore... I wonder if I can use something else instead...

[karl]

Hi There mtwallet,

First off, Congrats on the Oscillator Fix. Nice Work!

Your problem is capacitor companies stopped making axial lead capacitors.( Ones that lay like an axle on the board).

These days I am sure you can get a Radial lead replacement. Radial lead capacitors stand upright like a little lighthouse on the board. What you have to do is adapt a radial lead to fit.

Note: You can go higher on the voltage or capacitor specs, but not lower.

One Idea is to mount the cap on it's side somehow. ( a plastic wire tie might work if you drill some holes in the board, of course you must avoid any copper traces). After you figure out the mounting, simply add a large gage ( 20 ) wire to one lead and solder this to the other hole.
I would cover this wire with heat shrink or some plastic tubing
to avoid it from shorting out to the capacitors case, or any thing else.

Karl

[mtwallet]

thanks again for your help
but some axial capacitors are available on the net ; it's a 2200uf 25v, so I think it'll work...