This gretsch pro bass tube amp was made by supro in the mid to late 60's.The amp is the same circuit design as the supro thunderbolt variation with semiconductor diode rectification. Jimi hendrix may have owned and played this style amp. Supro made this amp for harmony and national as well I think. The amp has a 15 inch Speaker. This is not a reissue amp this amp is fron the 60's. I think the reissue amp goes for about a thousand new and it is a supro. supro came back into buisness after many years and is producing a reissue version of this amp. The amp has one volume and a bass and a treble for controls. The amp has two 6l6 tubes and a 35 watt output transformer. The preamp is a 12 ax 7 circuit with a 12ax7 inverter. This is not the supro coronado design amplifier associated with jimmie page.
There is plenty of information and schematics for this amp on the internet. The amp is a gretsch pro bass 6170.
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