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RE: Luxman LX-38 tube list?

joe3rp, hi. After the MB-3045 amps using NEC built Lux tubes 8045G and 6240G in addition to 12AX7 and 12AU7, Luxman reverted to simpler push-pull topologies - voltage amplifier into phase splitter into output tubes. The 6240G plug in replacement is the 6FQ7/6CG7. The 50C-A10/6C-A10 is an internally triode connected beam power compactron directly related to horizontal output tubes of the era. In this way it is like the octal based 8045G. I would guess the LX-38 uses 12AX7 and/or 12AU7 in the preamp section. The power amp section would most likely be a 6267/EF86 or parallel section dual triode (take your pick) as voltage amplifier. Phase splitter would be 6240G or 6FQ7/6CG7. I understand the 6240G resulted from a higher voltage 12BH7, but can't verify. To me this is strange since 6CG7/6FQ7 allows more plate dissipation in the first place. All these Japanese tubes (8045G, 6240G, 50C-A10) are decidedly odd ducks. The 50C-A10 has a 50 (!) volt filament. Lux biased these for 75mA on the plates. Despite using laminate metal plate structures and extra radiation wings on internals at 75mA the tube was cruising just under thermal runaway. Failures were just waiting to happen and they did. Do you have an LX-38 or are you just curious?


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