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05-30-2008, 11:20 PM
| #1 |
| Senior Member Join Date: Nov 2007 Location: Owosso, Mi
Posts: 621
| Bigsby phase shifter??
Anyone ever heard of/seen one of these? Dated 10/74 on the label, the name "Kuai" appears as well. Apparently it can be used as a wah/volume as well. Pix here: http://farm3.static.flickr.com/2411/...1ca5c87f_o.jpg http://farm4.static.flickr.com/3005/...ac07fd5d_o.jpg http://farm3.static.flickr.com/2378/...888e0fb8_o.jpg Does any service documentation exist? I have 2 of these in for repair and both are completely non functional other than noise from one. Its a fairly involved circuit with several transistors, 2 ca3080s, and 3 dual op amps. |
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05-31-2008, 12:57 AM
| #2 |
| Senior Member Join Date: May 2006 Location: Lansing, Michigan, USA
Posts: 10,352
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I've seen that twisty pedal assembly before, don't recall where. No help on the docs though.
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05-31-2008, 02:41 AM
| #3 |
| Senior Member Join Date: May 2006
Posts: 1,120
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Now, the second photo shows a plate underneath with the serial number. It also says "Systems & Technology in Music". I seem to recall that Systech pedals were made in Michigan. Is that the same company?
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05-31-2008, 04:23 AM
| #4 |
| Pickup Maker  Join Date: May 2006 Location: Montclair, NJ
Posts: 5,603
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That looks like the Systech logo.... from what I remember. I guess they used to be an electronics repair place or something... they sold the pedal to someone. That pedal does look familiar. Here's a Bigsby volume pedal http://www.guitars.com/features/bigsbyped/MC0011.html 
__________________ Those who create are rare; those who cannot are numerous. Therefore, the latter are stronger. - Coco Chanel www.sgd-lutherie.com www.myspace.com/sgdlutherie www.myspace.com/davidschwab |
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05-31-2008, 04:33 AM
| #5 |
| Lifetime Member Join Date: May 2006
Posts: 1,047
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If you can get clear, detailed high res photos of the top and bottom sides of the PCB and wiring, chances are I can reverse engineer it for you. Just from the complement of parts, they probably did an OTA phase setup (the two 3080s) and the rest is routing and stuff. |
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06-01-2008, 09:50 PM
| #6 |
| Senior Member Join Date: May 2006
Posts: 1,120
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That was my take on it too. Essentially a marriage of the Small Stone and Phase 45, with more pedal control.
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