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Frequently Asked Questions | Apex Tube Matching
PILOT SP-210 PREAMP C-1070 1071 1075 1076 FA-540 SA-232 SP-210 SCH
6C4 (1/2 - 12AU7) in first stage of Pilot 232 monoblock clone
Tube Amplifier Pilot SA 232 and Pilot Pre-Amp SP-210 hand built - YouTube