Carvin's amp lineup was completely different for 1961.  There were two models, both of which were based on the same chassis, with different output, and different speaker cabinet configurations.

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1961 Basses 1961 Guitars 1961 Bass Amps

The model #12-8CA amplifier used the #12-8S speaker cabinet, loaded with a 12" Jensen speaker, an 8" Jensen speaker, and a Jensen Concert midrange tweeter.  Also included was the model #8C amplifier head, which produced 50 watts of power.  This was a two channel head, with volume controls for each channel,  and well as tremolo speed and depth controls.  Price on the #12-8CA was $139.90, and the A-31 tremolo footswitch was an additional $5.00.

The model #12-CA was similar in appearance to the #12-8CA, but used a #12S speaker cabinet with a single Jensen 12" speaker.  The head was the #6C, which had the same controls as the #8C, but produced 25 watts.  Price on the model #12-CA was $99.90.

The back cover of the 1961 catalog showed examples of microphones that Carvin offered, including a crystal contact mic, a pair of contact mics, and an accordion mic.