1966 Supro Thunderbolt

Here is a vintage 1966 Supro Thunderbolt “S 6420″ electric (bass) guitar amplifier. This particular example, serial number 1 74764, is in very excellent, extremely clean, 100% all original condition! Though originally intended for bass, the Thunderbolt has since joined the proper ranks as one of the most popular vintage guitar amps. Great examples are somewhat hard to come by, especially those that are completely stock, including: the original Jensen C15P 15” speaker, original transformers, original RCA tubes, all original capacitors, and even the original spare fuse paper envelope. Rumored to have been used by Hendrix and Page as a means of capturing monstrous Marshall tone at microphone-friendly recording levels in the studio, the hi-gain tone structure really is unparalleled by other combos.

Serial Number: 1 74764
Speaker Code: 220623 (Jensen)
Transformer Code: 5246607

This ’66 Supro Thunderbolt utilizes: (2) 6L6 and (2) 12AX7 original RCA tubes through the original 1 x 15″ Jensen Special Design Speaker.

The original cross-hatched-silver-over-black tolex is in near perfect condition. The chrome control panel is very clean, and the corresponding screened text is very nice and intact. There is little oxidation on the hardware. The thin white stripe/band is very clean, intact, and nice. The grill cloth is in perfect structural condition and only exhibits slight fraying on the left side. The The original 15″ Jensen speaker is in excellent shape and sounds amazing. The cone is original, and it does not exhibit speaker fatigue nor voicecoil distortion. All of the electrical components are healthy and fully operational, and the amp is quiet and studio ready in as-is all original shape.

Great for slightly overdriven tone and even better for incredible crunch, this amp responds extremely well to all guitars.
Though the Supro Thunderbolt is the most famous of versions, Valco also produced the exact same amp under the Airline name and aesthetic for the Montgomery Wards brand known as a 62-9020A and a 62-9034.