I've developed an interest in the X-66, and have Googled as much as I can about the model.

However, I have a fairly basic question that I haven't been able to find the answer for: Was there more than one series of the X-66?

If, so what are the distinguishing features to look for?

Is there a serial number range I can refer to?

Thanks!

Hello,

S/N of X-66 consoles. Based on my knownledge, two versions of X-66's were produced.
Based on § 2-15 of the Service Manual, the earliest series was produced with 32-section scanner for drawbar voices.
Above S/N 421, 16-section scanner were used. There are not so much info available from the Hammond technical documentation.

All the best,

Dan.