This cool Tweed amp is a 1959 Gibson GA-18 Explorer 10” amp that has two 12AX7 preamp tubes, two 6V6 power tubes and a 5Y3 rectifier tube. The Explorer amp makes about 14 watts and features a great tremolo effect. Her pot codes date to the 52nd week of 1958. This is quite original other than sporting a later Fender Blue Label speaker. These kick ass w/low watts & the perfect tube configuration. Very Good overall.