Got it few days ago, for a half price of new PF-350, retubed it today.
This thing is very nice!
Power is sufficient (150W @4ohm), sound is very round and full, but cleaner (opposed to my SVP-PRO preamp)
Made in 1995, has two 12AX7 tubes inside. EQ looks simple, but every knob controls two frequencies (bass and treble in push-pull mode, working in conjunction with mid frequency)
Ultra lo filter works way better than in PRO series
SVP-PRO on the bottom of B1:
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Overall I'm very happy and I'm waiting for a gig!