Moog VCO which modern equivalent?

EricK · Post by **EricK** » Sat Feb 28, 2009 8:28 pm

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.

Eric

MC · Post by MC » Mon Mar 02, 2009 12:37 am

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?"

Kevin Lightner · Post by **Kevin Lightner** » Mon Mar 02, 2009 1:14 am

This?

Voltor07 · Post by **Voltor07** » Mon Mar 02, 2009 1:16 am

Kevin, how was that thing played? Did it have a keyboard, or what?

JohnLRice · Post by **JohnLRice** » Thu Mar 05, 2009 12:08 am

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

You may point to the photos on my site : http://yusynth.net/MOS-LAB/

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
_________________
yusynth
***************************************

JohnLRice · Post by **JohnLRice** » Fri Mar 06, 2009 6:51 pm

Sorry, I didn't notice until now that Yusynth's French page link didn't show up, here it is:
http://yusynth.net/fiches/index_fr.html

EricK · Post by **EricK** » Wed Feb 03, 2010 6:28 pm

JohnLRice wrote:Can anyone please explain why there are two different Moog VCO "types"? Was the 921A+921B(s) just a more economical solution than having a bunch of 921s or?

Will a 921 and 921A+921B pair sound pretty much the same or are they completley different?

Thanks!

According to the sales literature, there is a slight difference in the frequency range:

The 921b ranges from 1-40,000 hz.
The 921 ranges from .01 to 40,000 hz.

Those Mos Lab B's are looking better all the time.

oakpal · Post by **oakpal** » Sun Jun 06, 2010 6:23 pm

This may have been addressed but...

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.

Thanks.

EricK · Post by **EricK** » Sun Jun 06, 2010 7:33 pm

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

JohnLRice · Post by **JohnLRice** » Sun Jun 06, 2010 10:14 pm

Hi Eric,

Just a thought:

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!

cloudhop · Post by **cloudhop** » Thu Jun 10, 2010 11:20 am

Just to add to my query back in Feb 2009.

I have the Synth.com and an Oakley VCO kit (made up by me).

The Oakley, to my experience, is the nearest sounding Osc. to the early Mini's or indeed the
901b's. The Synth.com tends to have a more "sharper edge" which are unsimilar to early Moogs.
(Although they may be similar to 921b's but I have never compared)
When using the Oakley and my 901b's I sometimes have to visually check to see which are sounding.

Both the Synth.com and Oakley have very good and stable tracking but their output power is many times that
of the 901b's therefore I keep these mixed at low levels so as to not overload any other Moog modules when
replicating the early Moog sound.

Even so, the 901b's cannot be beaten on their unique timbre.

For any tech DIY's out there...I tried using the Expo conv. side of the Oakley Osc. to drive the 901b,s..I got some wild and unstable results for my effort.

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Moog VCO which modern equivalent?

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Re: Moog VCO which modern equivalent?

Re: Moog VCO which modern equivalent?