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Description

The Supro S6420+ Thunderbolt Plus Reissue is a revered blast from the past, reborn to captivate today’s guitarists with its vintage charm and modern functionality. Known for its distinctive high-gain preamp section, this combo amplifier offers a dynamic range that covers everything from warm, clean tones to rich, saturated overdrive. Perfect for the stage or studio, this amp is a versatile companion for musicians who desire both classic and contemporary sounds.

Housed in sturdy construction reminiscent of its 1960s predecessor, the Thunderbolt Plus Reissue features two channels, each with independent volume controls, allowing you to switch between tones effortlessly. This reissue also includes a switchable rectifier, providing the option between tube and solid-state rectification. A custom-made Supro BD12 speaker enhances the amp’s overall tonal quality, delivering clear, articulate sound across a wide frequency range.

Players will appreciate the intuitive controls and robust build, ensuring it stands up to the rigors of touring. Whether you're seeking that nostalgic Supro tone or pushing into new sonic territories, the S6420+ Thunderbolt Plus Reissue is designed to meet the needs of discerning guitarists.

Key Features:

  • 35-watt all-tube combo amplifier
  • Distinctive high-gain preamp section
  • Custom Supro BD12 speaker
  • Two channels with independent volume controls
  • Switchable tube/solid-state rectifier
  • Vintage-inspired design with modern enhancements
  • Ideal for both stage and studio use

Product specs

Brand Supro
Model Thunderbolt S6420+ Reissue
Year 2014 - 2025
Made In United States
Categories Guitar Combo Amps
Electronics Tube
Number of Channels 1 Channel
Number of Inputs 2 Inputs
Output Power (Watts) 60
Power Tube Type 6L6
Reverb None
Speaker Configuration 1x15"

FAQs

What type of music is the Supro S6420+ Thunderbolt Plus Reissue amplifier best suited for?

The Supro S6420+ Thunderbolt Plus Reissue is renowned for its vintage tube tone, making it ideal for blues, rock, and classic rock genres. Its warm, dynamic sound is perfect for guitarists seeking a classic, retro vibe.

Does the Supro S6420+ Thunderbolt Plus Reissue amplifier handle pedals well?

Yes, the Supro S6420+ Thunderbolt Plus Reissue is known for its excellent pedal compatibility, allowing effects pedals to enhance its natural tube-driven sound without losing clarity or dynamics.

Is the Supro S6420+ Thunderbolt Plus Reissue loud enough for live performances?

With a 60-watt output and a 1x15" speaker configuration, the Supro S6420+ Thunderbolt Plus Reissue is powerful enough for small to medium-sized venues, providing ample headroom and projection for live performances.

What kind of speaker does the Supro S6420+ Thunderbolt Plus Reissue use?

The Supro S6420+ Thunderbolt Plus Reissue features a 1x15" speaker configuration, which contributes to its full-bodied, rich sound, ideal for achieving a classic, warm tone.

Does the Supro S6420+ Thunderbolt Plus Reissue have built-in reverb?

No, the Supro S6420+ Thunderbolt Plus Reissue does not include built-in reverb, but its pure tube tone can be complemented with external reverb pedals for added ambiance.

ProGuitarShopDemos

ProGuitarShopDemos

Supro S6420+ Thunderbolt Plus

Video thumbnail for Supro S6420+ Thunderbolt Plus by ProGuitarShopDemos

Supro S6420+ Thunderbolt Plus

ProGuitarShopDemos

ProGuitarShopDemos

Video thumbnail for Supro S6420+ Thunderbolt Combo Amp Review | Guitar Interactive Magazine by Guitar Interactive Magazine

Supro S6420+ Thunderbolt Combo Amp Review | Guitar Interactive Magazine

Guitar Interactive Magazine

Guitar Interactive Magazine

Video thumbnail for Supro S6420+ Thunderbolt PLUS 1x15 Tube Combo Amplifier Tone Report Demo by Andy Martin by Supro

Supro S6420+ Thunderbolt PLUS 1x15 Tube Combo Amplifier Tone Report Demo by Andy Martin

Supro

Supro

Video thumbnail for Eric Nichelson of Midlake and the Supro Thunderbolt Plus by Supro

Eric Nichelson of Midlake and the Supro Thunderbolt Plus

Supro

Supro

Reviews

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Supro S6420+ Thunderbolt Plus Reissue.

Features and functionality

  • The Supro S6420+ Thunderbolt Plus includes a 15-inch speaker, offering a fat tone without being overly bassy, and allows switching between Class A, Class A/B, and Class A/B with silicon rectifier for varied power outputs.

    Source

User experience

  • Owners find the Supro S6420+ capable of achieving bright gain tones without fizz, and turning down the tone knob results in a dark, fat sound.

    Source
  • An owner highlights versatility, using the Thunderbolt with a wide array of guitars, but notes less satisfaction with lower tunings like Open C.

    Source

Comparisons

  • The Supro excels with low-output single coil pickups, but the Fender '68 Custom Deluxe Reverb reportedly handles humbucker-equipped guitars with better clarity and projection.

    Source
  • Despite being pricier, the Supro's distinct sound is unmatched, though the Fender '68 Custom Deluxe Reverb offers similar specs at a lower price point.

    Source

Use cases and applications

  • An attenuator like the Weber MiniMass is recommended when aiming for dirty tones at manageable volumes, as the amp breaks up early but becomes loud quickly.

    Source
  • Users suggest the Thunderbolt can handle bass in a bedroom setting if not cranked, but advise against excessive low frequencies to protect the speaker.

    Source

Mods and upgrades

  • Owners have replaced stock 5881 tubes with JJ 6L6s and swapped the stock 12AX7 with a Tung-Sol 12AT7 for increased clean headroom without re-biasing.

    Source

Critic Reviews

Guitar Interactive review of the S6420+ Thunderbolt Plus - Supro USA

suprousa.com

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