Yamaha TA-20 Vintage 1960s Wedge Shaped Guitar Combo AmplifierNotes Reverb and tremolo effects do not seem to function both are controlled via footswitch but do not activate when using foot switches that we have available. Slight hum at power up A Yamaha TA 20 Vintage 1960s Wedge Shaped Guitar Combo Amplifier in Good condition! At Evolution Music, we attempt to highlight cosmetic defects (if any) by picturing every angle of every piece of gear so you know exactly what you are getting. We always picture any and