Sam Ash Customer Service 800-472-6274
Free shipping on orders $9.99 or more. Free Shipping On Orders $9.99 or more. Sam Ash Music retail locations.

Supro S6420 Thunderbolt 1X15" Combo Guitar Amp


(3 reviews)


Print page
You need Flash player 8+ and JavaScript enabled to view this video.
  • Images (10)
  • Video (6)
MSRP: $1,595.00 $1,199.00 Save : $396.00 (25%)
More on the way - call 800-472-6274 or chat for availability

Protect Your Investment! ( More Info )

MSRP: $1,595.00 $1,199.00 Save : $396.00 (25%)
Add to Cart
  • Description
  • Reviews
  • Discussions
  • Specs
  • More Info

True to vintage spec, this legendary amp's cathode-biased 6L6 output section produces 35 watts of pure rock n' roll power at a price that working musicians can afford.

Two knobs and the TRUTH: The legendary 1964 “Blue Rhino Hide” Supro Thunderbolt is back. Renowned for its bold, full-range sound and up-front, honest midrange, the Thunderbolt covers a remarkable spectrum of vintage tone while wringing every ounce of personality from whatever guitar is plugged in. From clean jazz to Tele twang, soapbar blues to humbucker grind, the Thunderbolt dishes out 35 Watts of “Class A” tube tone from its vintage Supro dual 6L6 power plant. True to the ‘64 version of the Thunderbolt, a 5U4 rectifier tube is employed to deliver that unmistakable high-powered vintage sag. Normal and Extra hot input options, combined with a wide range of available gain on tap, allow you to fine-tune the texture and response of this amp’s massive sound. Turned all the way up, the Thunderbolt exhibits nearly zero self-noise; yet it puts out enough volume to be easily heard on large venue and theatre stages, with overdrive completely controlled by the guitar’s volume knob.

Massive custom transformers and lightweight, vintage-correct cabinetry—combined with the best-sounding 15” guitar speaker money can buy—put the Thunderbolt in a class of its own. With the amp turned all the way up, chords ring with exceptional clarity and definition, amidst copious amounts of tube overdrive and output-stage saturation. Available once again in all its bonafide Supro glory, the Thunderbolt returns in style.

In an effort to recreate the musical glory of the original Supro amplifiers, Supro has partnered with Eminence to bring you a series of USA-made speakers unlike anything else available today. Using a recipe that includes an edge-wound voice coil, ceramic magnet and lightweight stiff paper cone, the custom speakers found in Supro amplifiers deliver vintage American tone, with far more power handling, superior efficiency and nice firm bottom.

Supro’s “Thunderbolt” was marketed as a bass amplifier. Despite this original intention, the Thunderbolt has been recognized as one of the greatest guitar combo amps ever made, and has long been associated with Jimi Hendrix. Jimi played a Supro Thunderbolt early in his career while touring with acts like Little Richard, The Isley Brothers and Ike Turner. It has also been said that Hendrix used a Supro Thunderbolt to record his original hit single, Hey Joe. It’s no surprise the Thunderbolt found favor with Hendrix; its robust headroom for the time, fat-sounding 15” speaker and resonant open-back cabinet are perfectly suited to the slippery rhythm guitar style Jimi used in this R&B context. Cranked all the way up, this combo brings the legendary Supro overdrive tone to life at a volume level suited to large club stages.

  • All-tube Supro circuit
  • Normal and Hot inputs
  • 35 Watts "Class A" 6L6 power
  • 1 x 15" Supro TB15 speaker
  • 2x 12AX7EH
  • 2x 5881 / 6L6WGC
  • 1x 5U4GB Tube Rectifier
  • Blue Rhino Hide
  • Assembled in USA
  • Vintage design by Valco
  • Re-engineered by Bruce Zinky & David Koltai
  • Cabinet Dimensions: 23 5/8" x 19" x 10 1/2"
  • Weight: 45 lbs

Get your Supro Thunderbolt 1X15" Combo Amp today at the guaranteed lowest price from Sam Ash Direct with our 45-day return and 60-day price protection policy.

Things You Will Get:

    Guitar Amplifier


by PowerReviews
Supro S6420 Thunderbolt 1X15" Combo Guitar Amp

(based on 3 reviews)


of respondents would recommend this to a friend.

Reviewed by 3 customers

Displaying reviews 1-3

Back to top

(1 of 1 customers found this review helpful)


Way to go Supro!


from Rimouski Qc


  • A Beauty
  • Full Dynamics
  • Portable
  • Tone Tone Tone


  • No Reverb Or Tremolo

Best Uses

  • Blues
  • Jazz
  • Rock

Comments about Supro S6420 Thunderbolt 1X15" Combo Guitar Amp:

Sounds loud enough to play in any kind of blues bands. I use it especialy in a blues rock context. The 15 inch speaker sounds incredably well and gives this amp a unite voice. At low volume, it's harder to really feel the difference between the different rectifier options. But once at 1/3 of the volume, it gets pretty obvious. All settings sounds great!

  • Was this a gift?:
  • No



from Huntington , NY

Staff Reviewer

Comments about Supro S6420 Thunderbolt 1X15" Combo Guitar Amp:

Instant Classic! If you are looking for a pure no frills tone mammoth then this amp is for you! 35 Watts of pure bliss, this amp has 2 knobs volume and tone! High and low inputs make matching the gain output of either single coils or humbuckers a breeze. The amp is super responsive and the sound stays clear and articulate no matter where you have the volume knob. The amp loves pedals! the single 15" speaker really pushes out the sound and does not disappoint with the low end bass response.
Try setting the amps volume on max and control the dynamics with your guitars volume for touch responsive texture. Best of all this masterpiece is proudly made on Long Island, NY USA!!!
This is a real hands on review, I am a Sam Ash staff reviewer.


Classic tone


from Columbus, OHio

Staff Reviewer


  • Great sound
  • Vintage Styling


    Best Uses

      Comments about Supro S6420 Thunderbolt 1X15" Combo Guitar Amp:

      This amp is a classic reissue of the famous Supro amp used on many Led Zep recordings. Paired with a Telecaster , it breaks up nicely as the volume is cranked and serves as a great host amp for pedals. As expected,The 15" speaker gives a lot of warm bottom end. This blue beauty is a unique sounding amp and stands out among all the Deluxe and AC clones on the market.
      This is a hands on review by Jim at Sam Ash Columbus

      • Was this a gift?:
      • No

      Displaying reviews 1-3

      Back to top

      Weight .
      Dimensions .
      Series .
      Model Thunderbolt
      Information not available