Steelphon S900 // Mellotron M400

This is a demo of Tom’s Steelphon that got whooped by UPS - broken circuit boards, broken MDF case, no output. We took the case to be reproduced by Kent Meloy of Tunguska Guitars and in the meantime went to town on the electronics. There isn’t a schematic available anywhere, but after getting the rails back and the keyboard CV working, there was still no output. I isolated it to the filter board and realized the VCF is a Moog copy, component-for-component, so I used a Minimoog schematic to help troubleshoot the problem.
The Mellotron is mine and has undergone quite a bit of work. New pinch rollers, new motor control board, rebuilt the PSU, and fabbed a new key as one was missing.
Also, the RE-201 is for sale as of now, please reach out if you are interested.

[@neutralearth1061]

Sweet! Our Mellotron Overlords approve of this glorious offering!

[@LisaBellaDonnaMusic]

P E R F E C T ! ! ! Love this Peter Foley!! Great to see my old ARP Running down an astral dream with you!

[@richardtrussell8220]

Lovely! I dreamed of tangerines all the way through it. Thank you.

[@vintageaudioinstitue]

The schematics are online now, but it’s pretty recent, a month or so. The Steelphon is a beast ❤

[@andru6967]

Absolutely lovely 🌹

[@marsupialmicron]

Is this Edgar’s ghost?

[@MonkeyUnit]

You had me at KHKHKHHKHKHKHKSSHSSHSKSKSHSHSKKKSSKKKCHCHCKCKSKSKHSHSCCHSHSK!!!

[@MarkRoss-v4y]

Really nicely done, bravo!

[@RadicalCaveman]

I don't know how you fixed it, but the sound wafted down from Electric Heaven.

[@Patrick-bm6ih]

Nice!

[@bronxcartel6193]

They both have cute little keyboards don’t they

[@thesupersoundoftrieste]

Nice tangerine

[@thedecadentorchestra]

very klaus baby , very klaauuus . Enorme !

[@synthnerd4539]

Nice. What kind of oscillator design did they use? I've seen a few old 70s designs with sawtooth core followed by dividers to give the octaves, is this something similar?

[@foleytronics]

Yes, except at least one is a square wave; the other might be sawtooth but I can’t remember off the top of my head!

[@EusouoBenjamim]

🪐

[@martindirkzimmer]

TRANS EUROPE EXPRESS

[@frankschneider7190]

furchtbar… da dreht sich Edgar im Grab um.

[@GrimVoxTech]

Nice!