The EL84 based power section is switchable between a 5W triode mode and a more dynamic 15W pentode mode configuration, for the ultimate in low power valve amplifier flexibility. Two channels, one based on an EF86 Pentode and the other an ECC83 Triode, refine legendary vintage and boutique reference tones. Hi I am building a tube amp with 2 input channels based on a design in AX84. Can one stage of 12AX7 be used as cathode follower? 07-30-2011, 08:22 PM. Vintage Audio (record players, hi-fi etc) EF86 as Preamp. It recently gained popularity because it is. TAD EF86 / 6267 Premium pentode is selected for low-noise and low microphonics and is used in many (european) hi-fi preamps. Z is also a 12AX7, and those are the only Voxish flavors in the box. The Hot Cat model is also based on a 12AX7 preamp, the Dr. I believe that both the AC30 and the AC15 are modeled on the 12AX7 side of the circuits, and the Matchless model is a Chieftain, not a DC30, so it's an 12AX7 preamp as well.
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