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| Make |
various |
| Model |
COTK C901ABC osc/ C902 vca / C938 |
| Description |
For sale:
5 x COTK modules
1 x COTK to Synthesizers.com busboard (rare and hard to find)
A solid foundation for a Moog-style modular setup—just add a filter and an envelope generator.
Club Of The Knobs COTK C901ABC Oscillator MU/.com Dotcom / 5U /Moog 901 Clone
This is a Moog 901 clone from COTK
The Moog 901 came out in the late 1960's .. possibly 1965 to 68 ?? It's what is called a first generation VCO. You can use this as a VCO & VCLFO (voltage controlled LFO) It's a classic, and arguably this oscillator has influenced all VCO designs..... not just of Moog, but of synth manufacturers from around the world.
901a is the controller
901b is the oscillator
901c is the output module
basically moog 901s (and clones) have a lower amplitude sound that you can amplify/ slightly distort (usually with a CP3 transistor style mixer) before running them into a moog filter
but with 901c output module you also get outputs in modern modular format audio level. (and you can use them as the worlds most expensive LFO i suppose)
Condition: Used, some rack rash (previous owner), small scratch on the 901A module—see photos for details.
Club of the Knobs COTK C902 VCA
This is a Moog 902 VCA clone from Club of the Knobs. Its on MU/5u/Dotcom format.
It does what it is supposed to do. This module is a simple transistor based voltage controlled amplifier with
either linear or exponential response. But simple doesn't mean boring sounding. This is one the workhorse VCAs of SynthLand. If you are looking at this you probably know how nice it sounds.
Condition: Fully functional, but the (LIN/EXP) switch has a soft feel. Given its age (10+ years), this is reflected in the price.
COTK C938 Reversible Mixer
The C 938 is a reversible mixer with attenuated inputs and a master gain multiple output. It can combine both AC and DC voltages.
very useful attenucerter & mixer modular utility module
Module in pristine condition
Power & Compatibility:
All modules have COTK power connectors. You can power them if you:
- Have a COTK busboard (included in this sale) to connect to an MU/Dotcom case
- Use a COTK system
- Have a Moon Modular case that supports COTK power connections
- all COTK cables to connect to busboard are included and a dotcom cable to connecto to you dotcom case.
A solid foundation for a Moog-style modular setup—(just add a filter and an envelope generator or two)
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| Age |
n/a |
| Weight |
6 kg |
| Condition |
Average |
| Location |
Uk |
| Vat |
Not from a VAT-registered business. But VAT / duty may be due if importing from outside your trade bloc. |
| Quantity |
1 item is available from the owner |
| Options |
User manual : No |
| |
Service manual : No |
| |
First owner : No |
| |
Original boxes : No |
| Plug type |
Plug not required |
| Voltage type |
no power supply included |
| Status |
Item has been sold or not sold in a previous auction |
| Sale type |
The item is on the auction rooms |
| Ending on |
12/04/2025 |
| Category |
Synthesizer (Modular) |
| Serial number |
C2525 / C2526 / C2524 |
| Sphere reference |
# 28919 |
| Statistics |
Created on : 16/03/2025 |
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Changed on : 17/03/2025 |
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Published on : 17/03/2025 |
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Displayed : 578 time(s) by members and guests |
| Safety |
All electrical items sold in VEMIA are deemed to be trade sales. No warranty of electrical safety is given or implied. Many items are vintage and would not pass current electrical safety standards. It is the responsibility of the buyer to ensure that items are safe to use in their future environment - if necessary by using the services of a professional. |
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Prices and conditions  |
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The following section gives you the prices as well as shipment and payment conditions associated with the item. Payment is always requested in GBP. Converted price is shown for information and converted with Sphere standard currency rate.
Shipment and Payment links gives you access to an extended description of our rating :
| Start price |
300 GBP |
| Converted price (1) |
300 GBP |
| Shipment |
International or local shipment to pay |
| Packing costs |
0 GBP |
| Payment |
Full pre payment needed |
| Auction bid step |
20 GBP |
| Auction highest bid |
320 GBP |
| Converted highest bid |
320 GBP |
| Leader or winner |
nativevs |
| (1) Currency conversion |
Note that conversion rates were last adjusted on 10th October 2025 at 14:22 CET. They are there to give you a rough guide to the bid price in your currency. Please check for a more up-to-date conversion at https://www.x-rates.com/calculator.html. The bid price will be the actual price in pounds (GBP) at the moment the auction closes. This will be roughly converted to your currency for your information.
For technical reasons, we are unable to update the conversion from GBP to Euro during the auction, although it may change at any time. If you are in the euro zone please check the current rate at https://www.x-rates.com/calculator.html
Payments must always be in GBP. For more info please see the FAQ about exchange rates.https://spheremusic.com/Winfaq.asp?Question=91. |
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