![]() JMI designed a solid state two channel preamp circuit for guitar and a second two channel preamp circuit for bass. The hybrid portion of the JMI Vox "UL Series" included models for guitar and bass. Much of the design and features of the British UL Series models was inspired by Thomas in America. JMI decided to develop a "hybrid" UL Series amp line that combined a solid-state preamp with a tube powered output stage, bridging the gap between tubes and transistors. The Vox "UL Series" Reintroduces Solid-State Preamp Circuits and Incorporates Modular Construction at JMI (1966) The manufacturing efficiencies demonstrated by Thomas Organ would soon have an impact at JMI. The Super Beatle, Royal Guardsman, Buckingham, Viscount, Sovereign, Westminster and Scorpion amplifiers were all constructed using combinations of these preamp and power amp modules. ![]() The 60 and 120 watt modular solid-state amp modules incorporated silicon (rather than germanium) output transistors with large heat sinks, making them both durable and dependable. Thomas Organ also developed 30, 60 and 120 watt modular solid state power amps that would connect interchangeably with either the guitar or bass preamp via a nine pin connector. Using this philosophy, Thomas designed a three channel transistorized modular preamp chassis for guitar and a second two channel transistorized modular preamp chassis for bass in the fall of 1965. Thomas Organ was a proponent of the efficiency of solid-state modular amp construction using printed circuit boards. It wasn't until Thomas Organ established a successful record of producing transistorized Vox amps in America that JMI was willing to once again attempt production of solid-state amplifiers. These amps were prone to frequent failure due to the fragile nature of the germanium power transistors in their output stage. It was a 30 watt hand wired circuit that was included in two models, the T.60 bass amp and the LW30 guitar amp. Prior to 1967, JMI had produced only one purely solid-state amplifier design. Each model had a unique circuit design that was hand wired on chassis mounted tag strips, a highly inefficient and labor intensive process. When Beatlemania blew the roof off at JMI in 1964, the UK Vox amp line was made up of a series of hand wired tube amps whose circuitry shared little in common. The Impact of Thomas Organ at JMI (1965-66) ![]() JMI now moved away from hand-wired tube amps in favor of modular, solid-state circuits built on printed circuit boards. The introduction of a series of new British made Vox guitar and bass amps in 1967 demonstrated the influence exerted on JMI by Thomas Organ, the manufacturer of Vox products for North America.
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