Supro S6420 Thunderbolt 35-watt 1x15" Tube Combo

35-watt 1-channel All Tube 1x15" Guitar Combo Amplifier - Blue Rhino Hide Tolex
Supro S6420 Thunderbolt 35-watt 1x15
Supro S6420 Thunderbolt 35-watt 1x15
Sweetwater Savings: $391.00 MSRP: $1,590.00
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Supro S6420 Thunderbolt 35-watt 1x15" Tube Combo
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Plug in, Crank it Up, and Rock!

Just in time for its 50th anniversary, Supro has reissued the S6420 Thunderbolt tube guitar amplifier. Like the Fender Bassman, the Thunderbolt was originally intended to be a bass amplifier. While far from a stellar bass amp, the Thunderbolt quickly became a holy grail tone device for electric guitar players. Indeed, the first time you crank up this Thunderbolt reissue, you'll be treated to a huge, raw, overdriven, rock 'n' roll tone cascading from a custom designed 15" Supro TB15 speaker. Simplistic, sporting only a tone and volume control, the Supro S6420 Thunderbolt tube guitar amplifier's cathode-biased 6L6 output section produces 35 watts of pure rock 'n' roll power. Call your Sweetwater Sales Engineer and get plugged in!

The Supro S6420 Thunderbolt Combo Guitar Amplifier at a Glance:
  • Supro - a brief history
  • The Supro Thunderbolt - a historic mistake, a modern miracle
Supro - a brief history

Supro's roots can be traced back to the 1930s, when the National Resophonic and Dobro guitar companies merged to form a manufacturing entity called Valco. Valco manufactured Spanish acoustic guitars, metal-faced resonator guitars, and electric lap steel guitars under a variety of brand names, including Airline, Oahu, and National. They also designed amplifiers for several other companies such as Gretsch, Harmony, and Kay. It was during this time that Valco began producing guitars and amplifiers under the Supro name. Extremely popular amongst Southside Chicago blues musicians in the 1960s, Supro amplifiers proved equally popular with the British musicians who were influenced by them. By the late 1960s, notable guitarists ranging from Jimi Hendrix to Albert Lee to Jimmy Page were seen playing Supro amplifiers. Original Supro amps often sell for premium prices on the used market because of their legendary unique tone.

The Supro Thunderbolt - a historic mistake, a modern miracle

Once upon a time, a certain manufacturer created one of the worst-sounding bass amps ever produced. It was underpowered, distorted like crazy, and the speaker's baffle board couldn't handle low frequencies, so it fluttered around in a disruptive fashion. The manufacturer continuously tried to market the amp to bass players, but they all turned up their noses. All seemed lost. Then, one day, an adventurous lad plugged an electric guitar into the amp, turned it all the way up, and experienced the most amazing raw tube distortion they had ever heard. It sounded positively huge! Before they knew it, guitarists from all over the land wanted to experience this epic, raw, overdriven, tooth-rattling sound for themselves. A promising young guitarist named Jimi was even spotted playing through one while he was on tour with Little Richard and the Isley Brothers. The rest, as they say, is history!

The Supro S6420 Thunderbolt Combo Guitar Amplifier Features:
  • 35-watt cathode-biased 6L6 output section delivers plenty of tone and volume
  • 1 x 15" custom designed Supro TB15 speaker delivers classic vintage sound
  • Tone and volume knobs makes dialing in your tone simple
Deliver some pure rock 'n' roll tone with the Supro S6420 Thunderbolt tube guitar amplifier!

Additional Media

Guitar Amp Buying Guide

Tech Specs

Type Tube
Number of Channels 1
Total Power 35W
Speaker Size 1 x 15"
EQ 1-band
Preamp Tubes 2 x 12AX7EH
Power Tubes 2 x 5881/6L6WGC, 1 x 5U4GB (Rectifier)
Inputs 2 x TS
Height 19"
Width 23.625"
Depth 10.5"
Weight 45 lbs.
Manufacturer Part Number S6420

Customer Reviews

Based on 2 reviews
Write your review

nowhere to run...nowhere to hide

I waited a couple of months to write this as I really wanted to get into this amp enough to understand is truly amazing! Simple, thoughtful and loud. It is so pure that if you suck as a guitar player and need effects and tricks then go home....this amp is not for you. If you really want to hear yourself play whithout any BS then this is what you want. Turn it up and go for a ride! Real, authentic, legitimate tube sound. As always, my sale engineer Matt Emick has been extremely helpful...he is a wealth of practical knowledge and can help you with anything
Music background: former pro now hobbyist

New Thunderbolt

If you are going to re-issue an amp why not make a faithful reproduction? This re-issue is completely different from the original. The chassis and the controls are on top instead of on the bottom as the original is. What else did they decide to change in order to make a few more bucks? Sounds ok but not the same as an original.
Music background: guitar
See also: Combo Amps, Supro, Supro Guitar Combo Amps