THD Plexi Amplifier
The next amplifier in production was the Plexi, manufactured from 1990-1993. Although it, too, was physically styled after the Fender Bassman (and was also available in tweed,) electronically and sonically, it was meant to mimic an early JMP Marshall. In 1992, Guitar Player Magazine conducted a one-to-one test with a 1973 JMP Marshall 50-watt amplifier head, and found the two sounded “very close”. From 1990-1991, a very limited run of THD 50-watt bass amplifiers was also produced. These bass amplifiers were dubbed the “Classic Bass Head”. For the last 18 months of the Plexi’s production, several minor circuit changes were made, prompting THD to rename it the “Type-O”.
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