Bernard Speight, Azimuth Co-ordinator, 1969. London. Via V&A
This was a joystick device for controlling a quadraphonic sound system. By swivelling the stick, the sound output could be shifted from one speaker bank to another. It was used almost exclusively by Pink Floyd and operated by keyboarder Rick Wright. This equipment was used at their 1969 Royal Festival Hall show and was one of Pink Floyd’s first uses of quadraphonic sound in a live environment. They would later go on to develop and champion it for their album Dark Side of the Moon.
Fly the lead and rhythm guitars under a bridge, perform a quick Immelman and hammerhead then snap roll into an inverted flat spin to open a demonic time portal to the 70s.
whoa, shit! glad to see you posting again. find the schematic for it or datasheet for whatever delay IC it uses (panasonic MN i guess), look for NE571 compander, filters, etc and bend from there!
Panasonic MN? If only I were so lucky!
At least finding the unit’s ICs was easy considering that everything inside is fully discrete apart from an easily identified NEC uPC592H2 high output impedance amplifier and two CX7932 chips.
These CX7932s seem to be quite rare as it has taken a lot of hunting around to find any reference to them that isn’t merely a list entry on specialist rare component sourcing merchant sites.
I just found this old reference - http://www.electro-tech-online.com/threads/help-identifying-ic-in-amp.27286/ - which identifies the CX7932 as a Sony delay circuit (and correctly notes its DIP8 packaging unlike many of the other search results).
That forum thread’s link to PrelcoParts is dead, though, so I’m still without a datasheet or further clue. Can anyone out there help with some info on this delay chip?
So, I’m giving my old JHS EM-270 Analogue Echo Chamber BBD delay unit some maintenance love as its potentiometers, sockets, and power switch require long overdue cleaning (or more likely replacement), and the PCB needs a scrub to remove crusty old solder flux.
A quick DuckDuckGo search uncovers this video demonstrating some pretty interesting circuit bend modifications:
Does anyone out there have any experience, suggestions, or insight into doing such mods they’d like to share? (Fitting a small bandpass filter after an additional switched feedback path for aggressive feedback drones is a given. Simply looping the raw delay output back into a spare mic input is fun but lacks control.)
Otherwise, I’ll have to resort to the good old circuit bending technique of unguided probing around until either something interesting happens or
noxiousdelicious smoke gets released and I’d far rather experience the former than the latter!
Elektro Moskva: upcoming documentary on the early Soviet electronic age.
Sound of Fear: John Carpenter talks with Simon Reynolds Part 1 (Part 2)
Music, or the lack of it, can make you see better.