Moog Model 15 Preset Box - first three oscillator demo...

[noddyspuncture]

I've finally finished building and calibrating my 901A & 901B modules as "revised/redesigned" and modified by Bob for Keith. Working from Bob's original drawings and notes it was quite a project but worked out wonderfully..! So my Model 15 has two 921A controllers with two 921B oscillators... and now these custom 901A & 901B modules which I have named the "k.e." versions.

[Dave Peck]

Thumbs up, Indeed!!

[jdkJake]

Very nice! You will have quite the performance instrument once you complete a few more of those preset cards.

[3vcos]

What schematics and docs are you working from?

[fitzgreyve]

[Flareless]

WOW!

[Micronians]

WOW, that is amazing.

[noddyspuncture]

What schematics and docs are you working from?

Keith Emerson's original Modular service manual.

[Jazzman]

I was searching the web for more info on this modular patch preset box. That lead me to your posts on the Moog forum. Very informative

https://forum.moogmusic.com/viewtopic.php?t=34772

Wow, that's quite a complex project. Good work.

[Peake]

[3vcos]

Secrets secrets secrets.

[Peake]

Such as how can they track so widely?

[3vcos]

Or just the notes from Bob

[noddyspuncture]

Or just the notes from Bob

I do have to honour the promise I made to my source to not share.
Also with Emo being a good friend of mine... it was on that agreement I obtained the info.

I can share demo's of the finished article though.

[noddyspuncture]

Such as how can they track so widely?

Two of the osc/controllers are the 921's... well, one of the 921 controllers I cloned myself but that was the easiest part of the whole project actually.

The 'Emo' 901A and 901B do track perfectly, once I found the right FET and calibrated it as per the instructions. It is a complete redesigned though and much more like the 921's than the original 901's which I suppose was the whole point of Bob deciding to revise them..?

Having said that, the original 901's in my R.A. system - with the diode array expo - and also the 901A & 901B I built myself track pretty well too. I've been using them live for years now..!

[Peake]

Awesome work, love it!

[noddyspuncture]

Awesome work, love it!

I'm planning on making another video showing the insides and the construction of the revised 901 modules, with a more detailed demo of the tuning and tracking etc...