The Airspeed FM-50 is like no other amp you have ever played. Hand-built in the USA and featuring all tube construction, the FM-50 also incorporates reverb, delay and tremolo, as well as boost and two master volumes, all controlled by a 7-button footswitch. Most importantly, when you change channels it changes speaker cabinets!
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https://austinguitarhouse.com/airspeed-fm-50-head-cabinets/