Up for sale, a 1965 Supro Thunderbolt model S6420 combo amplifier in exceptional condition and in perfect working order. This legendary tube amp was made in the USA by Valco, and is generally considered to be Jimmy Page's amp of choice for crafting many of the guitar sounds on early Led Zeppelin records. Lightly compressed, focused, and delivering that elegant, touch-sensitive drive wholly unique to Valco preamp circuitry, the Thunderbolt pushes roughly 35 watts through a pair of 6L6 power tubes and a Jensen C15N speaker. For everything from clean, wooly rhythm tones to saturated tube overdrive further up on the volume dial, the Thunderbolt delivers a pure sound with a simple yet ingenious circuit and only two knobs for Volume and Tone.
This amp has had the power supply updated with high quality electrolytic capacitors, and the preamp has been freshened up with new signal caps as needed, with high-quality tubular caps used throughout. Otherwise, the circuit is very original with stock transformers that date to ‘65, and CTS pots that date to the 15th week of 1965. Notable for being an early example of the Thunderbolt with a rectifier tube and sweet, tube driven "sag", the amp boasts a vintage RCA 5U4 in the rectifier position, along with a matched pair of Tung Sol 6L6 power tubes and matching RCA valves in the preamp. The chassis has particularly clean chrome with a light speckling of patina and all of the original black silkscreen lettering intact.
The amp is fitted with an era-correct Jensen 15" C15N ceramic magnet speaker with a very clean black frame and original gold foil label on the magnet. The cabinet is remarkably clean, with original gray textured covering and white piping. The baffle has been regrilled with similar dark gray thread. Aside from light wear at the bottom corners of the cabinet, there is very little wear to report.
The amp really comes to life after you turn it up past 12 o'clock, and sounds absolutely incredible when dimed. If you're looking for the essential Valco/Supro tone for recording or live use, look no further than this early ‘65 Thunderbolt.