When pushed into overdrive, it exudes a throaty growl that makes it a great lead amp for trenchant blues, roots rock, or garage rock, and really packs a lot of girth around the notes. Like the 5879 preamp tube, the Les Paul combo leans into a rich, thick, meaty, and predominantly warm tone, but with enough clarity and definition to help individual notes cut through – at least relative to the general performance of amps from that era. Like the 5879 preamp tube, the Les Paul combo leans into a rich, thick, meaty, and predominantly warm tone, but with enough clarity and definition to help individual notes cut through What does all this translate to when you plug your guitar of choice into the front of a good GA-40 and let it rip? Instead, this pentode in the preamp helps to ensure that a full, stout signal is passed along to further stages of the amp, and that the guitar tone doesn’t easily fold over into mush within the preamp stage itself. Like the EF86, it also has more gain than the 12AX7, but that isn’t saying its use indicates a high-gain circuit, by any means. (Image credit: HeritageAuctions / HA.com)
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