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Hello!
I am in search of an EL34/6CA7/KT77 type tube (strictly) for a Marshall JTM45/100 (EL34 version 4B). The B+ at the plate measures at 583-586V, and the amp can dish out some 130W+ RMS.
This amp is a bit of a monster and is reputed for eating tubes. What are excellent choices without having to perform any modifications to amp?
The Gold Lion KT77 came to mind as a main go-to, but I'm looking for 2nd opinions.
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May your tubes be lively and long-lasting. Holy be thy heater.
Follow Ups:
Steve (FenderLover) gave you some good advice!
The KT-77 Genalex are rated for 800 volts on the plate and 600 on the screen. That would be the tube I'd recommend, no doubt. Plus it's a killer sounding tube!
Be sure to get them properly matched!! The "factory/distributor" matching is horrid, just awful.
Heyo!
I just wanted to blast out an update on the performance on the Gold Lion KT77 in a JTM45 (535V at the plate). It performed fantastically! I'm confident the KT77 will meet the demands of the aforementioned Super100.
So, a little background. The JTM45 went from tired big-boy 6CA7's, to JJ 6CA7's, to EH 6CA7's, and then the KT77's. The JJ's lasted about maybe 20 hours of play time. The EH quad had a meltdown after 5 hours. The KT77's got their 1 hour run yesterday with no bad symptoms.
First and foremost, the KT77's held! NO GLOW SHOW! Like little sentinels, they stood their ground (punny!). Not one sign of glowing cathodes, glowing screens, or red plating. I hope NSensor never changes anything for the worse!
Second, the tone was out of this world! The 6CA7 gave a certain low-end body to the amp, but almost unnecessarily so in retrospect. As makers go, the JJ 6CA7 had a sort of a nasty bite and neutrality. The EH 6CA7 sounded dark and a little honky (not unpleasant if it didn't burn up after 5 hours).
The KT77 cleaned up and rounded off some of the low-end, and made the upper registers a little more present, pleasantly rich and chimey, but smoother across the board (especially under breakup). There was only as much bite as I would dig into the guitar. I find the KT77 has made the JTM45 bluesier. The KT77 seems to overdrive more easily, and does with a silky flowing sustain rather than a harder clip typical of beam-forming plate designs.
Awesome tube. It'll be a mainstay for people's amps, for sure.
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May your tubes be lively and long-lasting. Holy be thy heater.
Thanks for the tip, Jim :) I'll stick with that Gold Lion, then!
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May your tubes be lively and long-lasting. Holy be thy heater.
Excellent advice.
Honest amplification is better than excessive 2nd order distortion anytime.
Most Marshall dudes I know run the current EH 6CA7 or the GL KT-77. But, if the amp eats tubes, you may need to stabilize the output section. Ppl with amps that eat output tubes, usually end up going through grid stopper and screen resistors. Layout and checking for instability issues.
I remember there was a time that amps like Mesa Boogies and SUNN monsters used STR 6CA7 tubes, as OEM. Think that they were made by GE for these amp manufacturers.
Good luck with your selection and that monster amp. You perform in arenas? Just curious why anyone would need such power for gigging. Doesn't it takes a small army to move the cabs and head?
8^)
Hahahahha! It's not mine, it's my brothers, and he's crazy. No stage concerts yet but it's in the works! ;)
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May your tubes be lively and long-lasting. Holy be thy heater.
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