Vintage Synth Repair

----- Original Message -----

From: GB

To: vintagesynthrepair@yahoogroups.com

Sent: Friday, July 02, 2010 6:52 PM

Subject: Re: [vintagesynthrepair] Re: Prophet 10

I don't think it's tantalum either. Google for a photo of a similar looking one. I think it's a film cap but I can't remember what kind of film. Keep looking you are getting closer.

;

GB

----- Original Message -----

From: Frank Simon

To: vintagesynthrepair@yahoogroups.com

Sent: Friday, July 02, 2010 2:23 PM

Subject: Re: [vintagesynthrepair] Re: Prophet 10

That would make more sense yellow violet blue...476...47uF. It has to be that thanks GB. It is one of the biggest tantalums in the Synth

----- Original Message -----

From: GB

To: vintagesynthrepair@yahoogroups.com

Sent: Friday, July 02, 2010 9:09 AM

Subject: Re: [vintagesynthrepair] Re: Prophet 10

It might be yellow blue something. Sometimes the colors are a little hard to determine after so long (heat/dirt/etc).

GB

----- Original Message -----

From: Arto Koivisto

To: vintagesynthrepair@yahoogroups.com

Cc: SequentialCircuits@yahoogroups.com

Sent: Thursday, July 01, 2010 10:09 PM

Subject: Re: [vintagesynthrepair] Re: Prophet 10

;

> nothing but color code. If the cap is standing up it is a yellow dipped
> cap. Purple is the top color (maybe violet)and blue is below it. They
> are not color bands like a resistor but only them two colors that cover
> the entire componet with big thick color bands. Any help appreciated.

For those colors, this online calculator suggests its a 76µF 100V 20%
capacitor:

http://www.csgnetwork.com/capcccalc.html

Seems a bit of a weird size for a capacitor in a sequencer circuit, so
I'm wondering might your problematic capacitor be nanofarads instead? If
it was 76µF, it'd most likely be a electrolythic cap too.

Have you tried pulling the part from the board and measuring the
capacitance? This way, you might get some pointers towards hitting the
right decimal at least.. Any similar caps elsewhere on the other boards
that you have schematics for? Or have you identified what sub-circuit
the cap connects to (or is a part of)? F.ex. if it belongs to some
microcontroller clock osc circuit, it could also be picofarads.

Other than that, maybe flip a coin for a 680nF or a 68nF ceramic and
hope for the best ;)

.Arto.
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