Hello Brian:Look for a bad or leaky capacitor in the keying circuit,I
haven't seen this problem in a Wurlitzer, but I have seen it in other brands
of older organs made around the time of this Wurlitzer.
Tim K.
>From: "Brian Davies" <briang3oyu@...>
>Reply-To: vintagesynthrepair@yahoogroups.com
>To: <vintagesynthrepair@yahoogroups.com>
>Subject: RE: [vintagesynthrepair] Wurlitzer Hiss
>Date: Fri, 29 Oct 2004 14:36:11 +0100
>
>Many thanks for the ideas John \ufffd I shall certainly take a look around the
>cct and will certainly let you know how I get on.
>
>Brian
>
>-----Original Message-----
>From: John Brewer [mailto:john@...]
>Sent: Friday, October 29, 2004 10:59 AM
>To: vintagesynthrepair@yahoogroups.com
>Subject: [vintagesynthrepair] Wurlitzer Hiss
>
>Hello Brian.
>I have not worked on Wurlitzers but I was interested in your problem.
>OK, so the fault is common to both manuals but not pedals. How is the
>manual
>keying done on a 630. Is it done by diode switching? The first thing I
>would do is look around the keyboard and find the source of the keying
>voltage. From your description I would say the noise is on there. Just
>another thought. Wurlitzer???? Immitation theatre organ??? Does it have any
>kind of Brush/cymbal white noise generator in the organ. These trigger
>from
>the keyboards and if not set correctly can give a continuous noise rather
>than a brief pulse. Some white noise is also added to snare drums.
>As you have the drawings, you should be able to locate which section of the
>organ is sending this noise to the pre amp.
>Good luck. Let me know how you get on.
>JohnB
>
>
>
>
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