1971 Shaller rotorsound : leslie sim with 18 inductors !

[hair force one]

Vintage and crazy:

http://www.amps-n-bits.com/guitar-pedals/Schaller-Rotor-Sound-07.jpg
http://www.amps-n-bits.com/guitar-pedals/Schaller-Rotor-Sound-01.jpg
http://www.amps-n-bits.com/guitar-pedals/Schaller-Rotor-Sound-10.jpg

Don't know how this german radioshape works but it sure takes a lot of copper coils to turn that ol' guitar sound...

[Bernardduur]

Link does not work

[Paul Marossy]

Yeah, same problem here. 

[A.S.P.]

copy/paste...

somewhere I found a schem, some years ago

[RickL]

I've got one of these. It sounds kind of Univibe-ish. I also played through another one which had a much more intense sound than mine which lead me to fiddle with the trimmers on the inside of mine. I was able to make mine better but not a good as the other unit (I ran out of adjustment on the trim).

I'd be interested in looking at the schematic so I can figure which resistor to change to get a bit more adjustment out of the trim. I assume it's just a balance control between the dry and wet signals. I'd also like to know how to wire up a foot switch to the multi-pin jack.

[A.S.P.]

will take a little while to find that thing - had a headcrash recently, and w*ndows-update ruining the other machine... 
(that & the weather are also reasons, why Paul & Scott need a little more patience,
what might even be good for Paul, since it came to my memory, that I might even have an empty old original "Yoy-Yoy" shell in my hardware-vaults).

[BlueToad]

I have the schematics for this, for those interested. I am hesitant to post them online, since they are probably copyrighted, but I would be glad to send them to anyone who wants them.
PM/email me if you want them.
Carl

[Sir H C]

Can vouch for the seller, Melvyn is a great guy, packs really well, and gets some really cool oscure gear. 

I might have to call him on this one...

[A.S.P.]

the only detail missing in the original schemo however,
are infos about the coils... 

[BlueToad]

the only detail missing in the original schemo however,
are infos about the coils... 

On one of the schematics, the inductors are specified as P14/8, could that mean 14 turns of 8 gauge wire, or 14 gauge, 8 turns? Also next to the inductors on one of the schematics is R=600 Ohm ges, which doesn't seem to relate to anything else. Still probably not enough information to identify the things, but might be a start to some tinkering.
Carl

[Sir H C]

The R=600 ohms I was guessing is that they are making a delay line and that is the characteristic impedance.  Have to dig through the books to remember the formula for an RC line impedance.

I was wondering if they were all transformers as they show that second connection that then goes to the LFO section (if I am figuring out the circuit correctly).  Very weird way to control speed, LDRs from an AC light bulb.

[A.S.P.]

my factory-schemo from may 19th 1971 says P14/8, too,
but doesn`t have the 600 ohm marked anywhere.

I always have thought "P14/8" is an indication of the core-type...

[BlueToad]

Indeed, p14/8 seems to refer to the core following some googling. the 600 ohm is on a schematic dated 4/22/69, if I am not confusing date with something else.

[A.S.P.]

for those who can`t see the schem:
it`s a 2-branch circuit, 1-transistor preamp each,
which get passively mixed at the output by an "intensity" knob.
1 branch is "dry".
The other ("wet"), has 18 LC elements at the collector. (series-L, shunt-C (22nF) delay line).
The inductors ("L") are wound on 18 individual ferrite cores (looking like your average wha-inductor),
which carry a second winding each,
which is periodically dc-premagnetized by the LFO,
in order to vary the inductance of the "audio delay line".

[Dan N]

Ebay auction #7386450244 has very nice photos.