Rare Ampeg Portaflex B-15-N Bass Amplifier - Major Repair

Rare Ampeg Portaflex B-15-N Bass Amplifier - Major Repair

Conclude the repair process of a rare Ampeg Portaflex B-15-N Bass Amplifier in this final video of a three-part series. Complete power supply testing, clean up wiring, and properly dress the 20uf capacitor onto the board. Remove the hanging fuse from the cabinet and address issues with the speaker cabinet cable. Explore cathode bias settings and conduct noise tests at 200Hz. Investigate tube current under full operation and test the amplifier with a guitar to confirm performance. After passing inspection, reassemble the amplifier, make final adjustments to the hum knob, and complete the restoration of this vintage bass amplifier.