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1967 Valco Supro Thunderbolt 1x15" S6420 Amplifier
1967 Valco Supro Thunderbolt 1x15" S6420 Amplifier 1967 Valco Supro Thunderbolt 1x15" S6420 Amplifier 1967 Valco Supro Thunderbolt 1x15" S6420 Amplifier 1967 Valco Supro Thunderbolt 1x15" S6420 Amplifier 1967 Valco Supro Thunderbolt 1x15" S6420 Amplifier

1967 Valco Supro Thunderbolt 1x15" S6420 Amplifier



SKU: 90010

Out of stock


Player's Perspective

Music Store Live is proud to present this 1967 Valco Supro Thunderbolt S6420! We highly recommend this vintage amp for players and collectors who might be looking for a killer sounding 1x15 combo tube amp to use on gigs and in the studio. The tone this package is packing is totally authentic rock and roll and it literally couldn't be easier to dial in. We stand behind the claim that you can wrench Led Zep and Hendrix tones from this beast even if it isn't the exact amp used on some of those early recordings. We think this rig makes a killer tube amp for any studio environment. The 15" speaker pushes a fat amount of air through this cab and there is an unmistakably refined high end on this amp that makes lead guitar sound the hammer of the gods. Trust us. We'd rather keep this one for ourselves but unfortunately that's not the business we're in.

Item Details

Cranked up, this is one of the best sounding Blues / Rock riff and lead guitar tube amps ever made. The controls are simple as can be - Volume and Tone. Operating currently with a pair of vintage Westinghouse English made 6L6 power tubes and an older set of 12AX7 preamp tubes, this model features the black tolex with horizontal striped grillecloth. The original Jensen speaker has been replaced with an Eminence 16 ohm 15" that dates to 2000. The power cable has been replaced with a modern three-prong and the fuse holder has also been replaced. If you are looking for incendiary lead guitar tone, look no further. This amp will light up the stage and make a guitar god of almost anyone recording with it. 

Jimmy Hendrix owned one of these amps and while it's unclear exactly which amp Jimmy Page used to record a lot of the earlier Led Zeppelin material, it certainly sounds a LOT like this amp! Think Zep's "Heartbreaker".

Overall Condition

This 1967 Valco Supro Thunderbolt amp is in good condition. Everything works as it should with no issues. This amp is fairly quiet too with very low noise, which adds to the fact that it's great in the studio. The tolex is good with very few nicks and rips. Likewise, the grillecloth is also very good with no holes. The lettering on the chasis has faded a bit and the amp in general shows the wear of an amp that was likely a basement jam amp for decades. It probably hasn't gigged much at all. The upgraded power cord and newer fuse holder make this a much more stable vintage amp to use regularly.

We think this amp would fit great in a studio cranking out hits, in the collector's arsenal of smaller killer sounding tube amps or as just your favorite tube-tone combo to rock on at home. It's simple, it rocks hard and you can certainly play some gigs with it without having to worry. What an incredible sound!


  • 1967 Valco Supro Thunderbolt S6420
  • 1 x 15" Combo Amp
  • Original Transformer - Dates to 1967 
  • Original Black Tolex 
  • Original Grillecloth
  • 2 X 6L6 Power Tubes - Westinghouse
  • 2 X 12AX7 Preamp Tubes
  • Solid State Rectifier Tube
  • Volume and Tone Controls
  • Replacement Eminence 15" Speaker - 16 ohm - dates to 2000
  • Replacment Power Cord and Fuse Holder
  • Floor Mounted Chasis

Our in house guitar tech has inspected, tested, and cleaned all of our instruments on site prior to shipping. All of our instruments are guaranteed to be fully functional upon arrival.

Our Mission

Our team of musicians fuses the spirit of the local guitar shop with the convenience of the web by creating a reliable and worry-free buying experience.

At Music Store Live, our goal is to revolutionize the way gear is bought online. It’s not just about videos and know how; it’s about the person on the other end of the line. Whether you are in Tokyo or Toledo, we invite you to experience the reality of a living online music store and help us shape the best buying experience possible. As you'll see in the video below, we're musicians just like you. We strive to offer the best gear, the best online experience, and the best personalized service in the industry. We invite you to get to know our team, and we would love the opportunity to get to know you too!

Free Shipping - Free Return Shipping - 30 Day Returns

At we are proud to offer free return shipping and a 30-day return policy in the 48 contiguous states on all new* items over $30. It's all part of our mission to bring the guitar shop to your living room. This policy allows you to get your gear hassle-free and try it with your own rig to be sure that it truly fits with your playing style and sound. If it doesn't work the way you had hoped we'll send you a prepaid return label and work up an exchange or issue you a refund once we get the item back in the same condition it was purchased. It's that simple.

Please allow 2-4 business days from the receiving date for returns to be processed.
  • Your order must ship to the billing address associated with your credit card, PayPal, or other method of payment (unless an alternate shipping address has been approved by an MSL Gear Specialist).
  • If you want the shipment to be held at a shipping company hub it is your responsibility to make those arrangements directly with the shipping company.
  • An indirect signature will be required upon delivery for all transactions over $250. If you would like to require a signature on a transaction of less than $250, please request it when you place your order.
  • We do not insure packages valued under $3,000. If you would like to add insurance for delivery or return please request it when requesting your order or initiating your return.
  • All returns are subject to a Tech Check upon arrival. Any instrument that is returned with damage, wear and tear (including pick marks), missing or replaced parts, missing protective or packing materials are not eligible for a full refund.
  • *Used / Vintage / Clearance items carry our same return policy, except with a 3­ day return window.
  • Orders shipped within California will be subject to 7.25% state sales tax.

In most cases we ship same day if your order is placed by 12 p.m. EST Monday thru Friday!

Return Policy Details
Is your instrument just not doing it for you? We understand and we absolutely want you to be thrilled with any gear that you buy from If you're not happy with your order, you can return it to us at no charge within 30 days of delivery.

  • Customers outside the continental USA must pay their own return shipping and are responsible for all applicable taxes and fees.
  • The return policy does not apply to custom orders or modifications (pickup installs, etc)
  • Contact MSL at or (866) 256-5725 to begin the return process. You can request a refund, store credit, or exchange.
  • We'll provide you a return label via email.
  • Ship the item back to us in its original packaging using the provided return label.
  • Customer is responsible for returning the item to Music Store Live in its original condition.
  • A refund or exchange will be issued within 3 business days from our receipt of the returned item.
  • All returns will go through a technical inspection and are subject to a restocking fee if the item is not returned in its original condition. Restocking fee to be determined by MSL.

Layaways & Financing


  • Deposit a non-refundable minimum of 10% down of the purchase price on anything in stock
  • Contact MSL at or (866) 256-5725 to place your initial deposit.
  • Pay it off at your convenience within 30 days.
  • $100 layaway fee for each additional month over the initial 30 days (on most items).


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