What kind of mods did you do to the ACA's?
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I'd recommend the B1 buffer. If you're in need of gain in the pre-amp, that can be had with the Korg triode variant of the B1 or by adding a BAGS to the output of the buffer. I'm contemplating the B1 with a complimentary BAGS for my F5. It's the most neutral configuration to be had. The Korg triode configuration can be voiced to different distortion signatures by swapping resistors, which the kit comes with. The choices depend on how colored your ACA's are and whether you're looking for more color or not.
The BAGS is the Burning Amp Gain Stage and they come in 3 varieties, complimentary, single ended, and differential.