[sdiy] any thoughts on what this part may be?

Mattias Rickardsson mr at analogue.org
Thu Mar 17 08:48:37 CET 2016


Or a modern replacement of the now defunct Vactrols? ;-)

/mr
Could it be a very old VCA?

rick


On 16/03/2016 22:07, Travis Thatcher wrote:

> Weird! I actually heard back from Allen Organ:
>
> Travis: Thank you for your inquiry. The item you have circled is an
> LDR. This item has a photo cell on one end and a light bulb on the
> other end. It's used to turn circuits on and off. Most times just the
> bulb goes bad and would need to be replaced. You will need to go to
> the local Allen dealer for replacement items for this assembly. I’ve
> listed the contact information below and copied them on this message.
> Feel free to contact them directly.
>
> Never would have guessed LDR. Very curious to see if the local branch
> has any, have a call in to them.
>
> Thanks everyone for the thoughts. I'll take some gut pics of the
> broken one taken apart when I get back to my friend's place. The
> harpsichord is really pretty fascinating - lots of relays and really
> large bundles of brittle, thin wire carrying all the signals. There
> are two large frames, one for the 8' oscillators and one for the 4'
> ones, all are coil based.
>
> On Wed, Mar 16, 2016 at 5:04 PM, saure <saure at put.as> wrote:
> > Hi,
> >
> > I posted your image into a vintage radio forum and this is what I got so
> > far.
> >
> > http://www.vintage-radio.net/forum/showthread.php?t=124760
> >
> > Hope it helps
> >
> > -----Original Message-----
> > From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf
> Of
> > Travis Thatcher
> > Sent: terça-feira, 15 de Março de 2016 16:34
> > To: Synth DIY
> > Subject: [sdiy] any thoughts on what this part may be?
> >
> > Helping a good buddy with a really weird, rare old Allen Organ
> > electronic harpsichord. We actually got some schematics and docs from
> > Allen Organ who were intrigued by the weird aftermarket preset
> > controls that someone had built into the thing. Its basically all
> > working except for the 4' strings voice and we've narrowed it down to
> > the following part:
> >
> > http://recompas.com/hpschd.jpg
> >
> > Only problem is that I haven't the slightest clue what it is. I'm
> > guessing some sort of capacitor charging solenoid? The working ones do
> > not make any mechanical sound and when we swapped this one with a
> > known working one things operate as expected. I'm stumped!
> >
> >
> >
> > --
> > http://www.travisthatcher.com
> > http://www.soundcloud.com/thevoiceofsaturn
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
>
>
>
>
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