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EH 12AX7
Very balanced sound, low noise and microphonics probably due to the return of shorter plate structure. Balanced tubes work best in the 1st spot of the "3TM ADA Mod".
EH 12AY7
This is a great alternative to the NOS 12AY7. Super quiet and smooth, not just for Fender Tweed's, give these a shot in V1 or V2 to tame your beast and get more clean headroom.
EH 6L6GC
Improved construction over the Sovtek 6L6WXT+, but with a sound reminiscent of the RCA blackplate
EH 6550
The 6550EH is the finest current production tube for any amp using 6550 or KT88. The 6550EH offers the maximum power of any 6550 with the linearity guitar and bass players want. This extra headroom in a 6550EH equipped amp means bass players can finally realize the full dynamic range of the instrument and the sweetest tone available
EH EL34
This is an extremely musical tube very highly detailed, rich and smooth very close sonically to the Mullards.
EH 6CA7
This tube was designed to the same specs as the Sylvania large bottle 6CA7 with lots of detail and nice bottom end
EH 7868
Last of the 80's US military production, great all around tube for guitar amps and audio equipment.
EH EF86
Finally, a high quality current production pentode, very warm and smooth sounding.