I’ve no problem with those specs.
They’re probably guaranteed figures (derated) and 40Khz is nothing to sneeze at anyways.
My comments basically address that the two versions of 921s use the same boards and have the same tonality.
They’re implemented slightly differently when it comes to linear CV and sync abilities.
Overall I think they were good choices / compromises.
Remember, a 921 is twice as wide as a 921 A or B.
A Moog 15 would have been half filled with oscillators if it was all 921s.
You’d run out of mults quickly too.
That confirms what Kevin said. And after 20000Hz, who cares? Unless you’re making music for your dog. Some hi-fi horn piezo tweeters are rated up to 20kHz, but I’ve measured frequencies from them up to 50kHz.
OK, here’s a question:
Why are all Moog modules a 900 series? Were there series 100-800 that didn’t make the grade? Or did Bob just decide “921”, “911”, etc., just sounded cool?
Any one know or care to weigh in on this one?
Mr. Bucki?
Mr. Luther?
Mr. Lightner?
Right, wasn’t that because it was Harold Bode’s design, not Bob Moog’s?
Also, there are the Control Panel (CP) series modules as well as the 900 series.
EricK, I remember seeing pictures of this drum unit/thing on several diferent websites. I have never seen action shots of it in use, however. How was it played? Drum controllers, similar to the 1130?
THese are not mine, though I certianly wish. I did talk to one of the guys from Germany who was working with the museum and he said that for some reason they coudn’t power up those modules so noone knows if they still work.
Those belonged to Eric Siday, the second customer of Bob Moogs way back in 1964.
That “drum synthesizer” was used in the MOMA “Jazz In The Garden” concert. There’s a pic of it in Analog Days (it’s the modular on extreme right on pg 189), and Kevin has a closeup pic “What modules are in this thing?”
Just FYI: I asked Yusynth over on www.modularsynth.net if he could pop in here and share his knowledge and pictures of COTK and MOS-LAB since he owns modules from both manufacturers. He was kind enough to respond with the below message. I posted this same info in the Modular PCB thread here just to make sure everyone sees it who needs to. You can also search modularsynth.net for his posts.
John L Rice
Hi John
I try not to multiply the number of forums I am active on, otherwise I would spend all my time surfing through forums
I am also putting together some web pages with the description and analysis of some COTK and MOS-LAB modules that I will make public when completed (but this will take me some time though)… If your read French you can have a preview here
I have a MOOG 921A and would like to add additional 921B’s. Which “clone” manufacturer makes a module
that will work with the original 921A? I understand there are power supply issues. What I need to know is
if the control voltage and pulse width links are compatible. COTK and MOS-LABS seem to be the best choices.
Modusonics seems to have business and delivery issues.
I contacted Mos-Lab about this thru email and this was their response:
Hello Eric,
Power supply harness is not identical between Moog & Mos-lab modules. Power supply too. (+12V / -6V for Moog : +12V / -12V for Moslab : -6V regulation on each board)
You must have a +12/-12 power supply with -6V regulator for your 921-A, and a power bus for mos-lab modules. Then, you will must to have to calibrate the 921-A. After that, Moog 921-A will can drive Mos-lab 921-B with custom wires between these 2 modules.
Mos-lab doesn't sell external power supply.
Regards,
Sebastien
Maybe sell your MOOG 921A and with the money you get for it you’ll probably be able to buy a Mos-Lab 921A AND at least one, maybe two, Mos-Lab 921B’s!
I know that the Moog/Modusonics is a hard won and prized possesion for you but, if you were to go with all Mos-Lab (or COTK) version you should have zero compatability issues plus get more bang for your buck! (I often question my wisdom in having my (Don Martin) Moog 9504A LPF because for what I I paid for it, I could buy the whole triple set of LP, HP and coupler modules from COTK or Mos-Lab!
Best of luck. I’m glad to see you are going to get some modular action going!
