A Vox MC100/6 hybrid PA amplifier

General views

Thanks to Mick, some pictures of (and facts and figures relating to) a Vox MC100/6 from early 1967: 19 7/8" wide; 13 1/2" deep; and 9 3/4" tall ignoring the case feet. It appears that Jennings did not publish dimensions for the metal-clads after 1965. Weight is just over 4 1/2 stone = 29kg.

The top of the case with the preamp assembly removed: 19 7/8" x 13 1/4". When in place the preamp assembly protrudes a further 1/4" (so depth = 13 1/2", as noted above).

The box was originally hammertone silver.

NOTE: - the MC100/6 pictured above is the only one of the four currently known to have two rather than four speaker sockets, one for 8 ohms, the other for 15 ohms, and no impedance selector. It is likely that two principal types of set-up were envisaged: (i) two cabinets of 15 ohms each - Line Source 60 columns (?) - daisy-chained (in parallel) into the 8 ohm socket; or (ii) four speakers of 4 ohms each run in series into the 15 ohm socket.

Line Source 40 and 60 columns could be wired for a total impedance of 4 rather than 15 ohms.

The two speaker sockets are currently tied together on the 8 ohm tap.

Detail of one of the other three MC100/6s (identical arrangements).

The only cabinets in JMI's 1967 catalogue that would have been capable of handling 100 watts or more on their own were the AC100 SDL / Supreme and the Super Foundation Bass, none of which would have been much good for public address.