[sdiy] SSM2044 Replacement Daughterboard in Emu SP1200

[Colin f]

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl 
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of 
> Wheaton, Simon
> Sent: 29 November 2013 08:45
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] SSM2044 Replacement Daughterboard in Emu SP1200
> 
> Near the end of the Emu SP1200 reissue run(s), they ran out 
> of SSM2044 filter chips, and the last available units had the 
> pair of SSM2044 chips replaced with a functional clone 
> circuit on a plugin daughterboard.

I'll bet it's not a very close match for the sound of a 2044 once resonance
is turned up.
Does the board implement resonance ?
With 4 LM13600s, it'll be cascaded OTAs, rather than a patent-dodging
implementation of a Moog ladder using current mirrors.

Cheers,
Colin f