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Supro Rhythm Master 1 X 15 Tube Amplifier with Reverb & Tremolo

The Supro 1675RT Rhythm Master tube combo guitar amplifier delivers the raw, overdriven rock 'n' roll tone of the classic Thunderbolt, with the inclusion of a lush, all-tube reverb.

Supro Rhythm Master 1 X 15 Tube Amplifier


Supro Amplifiers: the Lore, the Legend, the Tone

For those players who love the huge, bold sound of the 1×15” Thunderbolt amp, but need a lush, all-tube reverb to fill out their sound, Supro presents the 1675RT Rhythm Master amplifier. Rooted in Supro tradition, this vintage inspired model is loaded with independent bass and treble controls, six-spring long pan reverb, output tube tremolo and switchable Class A / Class AB power amp wiring for 35, 45 or 60 watts of vintage American tone.

The Rhythm Master’s USA made custom 15” driver is the most accurate and true sounding 15” guitar speaker on the market, with a full, broadband sound that is never muddy. To create this signature speaker, we worked with Eminence to combine the best elements of our favorite vintage 15” speakers (Jensen C15PS & JBL D130) with modern construction methods and materials to achieve a vintage voiced driver with superior power handling and juicy bottom end.

The unique power amp topology of the Rhythm Master not only allows for players to change the texture and output volume of the amp but it also provides two very different, all-tube tremolo effects depending on whether Class A (cathode bias) or Class AB (grid bias) mode is selected. The cathode bias tremolo is vintage Valco/Supro all the way, where the overall depth of the effect changes along with the dynamics of your playing. The grid bias tremolo is gives a much deeper, stronger and more pronounced throbbing effect. Since the tremolo is performed by modulating the bias of the output tubes, the reverb necessarily comes before the tremolo effect, for a mesmerizing combination of pure tube reverb and tremolo when both effects are combined.



Single Channel with 2-Band EQ, Reverb and Tremolo

The Supro Reverb platform is the result of a design collaboration between Vibro-King Master Bruce Zinky and Supro House Engineer Thomas Elliott. This all-tube luxury channel provides ample headroom for use with pedals; wide-range treble and bass EQ knobs; and enormous all-tube reverb, which feeds into the final output stage tremolo.


Power Amps

6L6 35/45/60W Switchable Power

This unique power amp topology found in our flagship amplifiers provides musicians with the ability to switch between three different wattage levels. The 35-watt setting configures the amp in the traditional cathode-bias method, like a vintage, tube-rectified Thunderbolt. The 45-watt setting configures the output stage for grid-bias operation while still using the tube rectifier. The 60-watt setting switches out the tube rectifier for a silicon rectifier to achieve maximum output power and headroom, which is particularly useful for players who like to use pedals.



TB15 Speaker




Supro Construction

These Supro reissue amps are electrically based on the originals, and they are all PCB-based. Each model has a trio of PCBs that are hand-wired, directly to the transformers and to each other. There are no plastic connectors. Vintage tone, modern construction. Ready to tour. Terminal strip construction (à la vintage Supro) is not reliable or allowed by safety regulations; and turret board construction (vintage Fender/Marshall) is not true to the original Supro build. So, PCB it is! Low noise and durable, great tone. Made in Port Jefferson, NY, USA.


SUPRO TODAY - A Legend Reborn

In 2013, Absara Audio purchased the rights to the Supro brand name from infamous Fender amp designer, Bruce Zinky. In collaboration with Zinky, our Pigtronix design team created a line of Supro 1964 reissue tube amplifiers which first debuted at the 2014 NAMM show. The legacy of Supro amplifiers stretches back to the 1930s and reaches its original peak in the mid 60s with the Blue Rhino hide models that inspired our reissues. While guitarists such as Jimi Hendrix, Link Wray, David Bowie and Dan Auerbach used Supro amps and guitars, no musician is more closely associated with the Supro brand than Jimmy Page of Led Zeppelin. It is well known that in 1968, Page used a Tele plugged into a customized 1×12 Supro combo amp to record all of the guitar parts on Led Zeppelin’s debut album. The great irony is that Supro went out of business during that same year! Since then, the raw, blues power of Page’s Chicago-made Supro amplifier has been unattainable unless you had the fortune to acquire a vintage piece.

The signature element of a Supro amp is its “Class-A” power section, which maintains remarkable clarity and dynamics when overdriven. This gritty midrange sound is the original alternative to Fender… you could call it “the other white meat” of classic American tone! Every element of our Supro reissue amps has been designed from the ground up to bring this long-lost, holy-grail amp to musicians at a working player’s price. The Blue Rhino Hide tolex was specially made, the cabinetry is vintage-correct, the USA-made speakers are totally unique, the transformers are custom and the sound is 100% authentic Supro. Supro reissue amps are hand-assembled in Port Jefferson, NY, USA. In the 2 years since we announced the return of Supro, production capacity for these amps has been sold out, leading ultimately to the acquisition of a new, 15,000sq ft. musical instrument factory on Long Island to meet worldwide demand.

Supro amps are now sold in every major retailer worldwide, bringing these classic tone machines to more guitarists than ever before. The team here at Absara Audio, Pigtronix and Supro is determined to deliver a world-class experience for all Supro customers: from our distribution partners to the retailers that sell our gear, and of course, to the musicians who play our amps. We will provide concierge-level service to any and all customers who may need support. Supro reissue amps were born out of a passion for Rock & Roll as well as a deep respect for the history and unique circuity behind the Supro sound, and we nailed it! Joe Perry, Brian Setzer, Paul Simon, David Hidalgo, Joe Walsh, Randy Bachman, Steve Stevens, Robbie Krieger and Adrian Belew all agree. So go grab a guitar, and Discover the Legend for yourself!


The Guitar Magazine Review...

Guitar Player Review...


SKU 1675RT
Brand Supro
Valves 4x 12AX7 & 1x 12AT7
Effects All-tube reverb & Output-tube tremolo
Special Features 2x 5881 / 6L6 power tubes & 1x 5U4 Tube Rectifier
Speakers 1×15 Supro TB15 speaker
Weight (KG) 45lbs
Protective Cover Blue Rhino Hide Tolex
Controls Independent BASS and TREBLE controls
Includes Tube or Silicon Rectifier
Size Cab Size: 23 5/8” x 19” x 10 1/2”
Type Engineered by Bruce Zinky, Thomas Elliot and David Koltai
Voltage 240
Wattage Switchable Class-A (35 Watts) or Class-AB (45 / 60 Watts)


How much is delivery?
At Ivor Mairants Musicentre we offer thousands of products that are currently in stock and can be delivered to your home address, anywhere in mainland UK. You will be able to see your delivery charge at the "Checkout" page.

Do you offer Next Day Delivery?
Yes, we offer a Next Day Delivery service for in-stock orders placed before 1pm Monday-Friday. Next Day Delivery and Saturday Delivery carries an extra charge. Ivor Mairants Musicentre commit to delivering on time, we rely however, on our carriers to fulfil their contract in this regard, and can not be held liable for any failure of third parties in fulfilling delivery expectations.

Can I change my delivery address after I have placed my order?
Once you have placed your order with us, we are unable to change any of the information you have given us, as most orders are dispatched from our distribution warehouse. Our contract carriers however offer various levels of free of charge enhanced service such as DPD PREDICT, which allows the consignee to be alerted by e-mail and/or text message of the delivery window and allows for changes allowed by the contract carrier to the detail of the actual delivery time and/or location. Where such services are available all orders will benefit from auto enrolment in the services. Ultimately, if there is no-one to sign for your delivery, you will be left a card by our contract carrier inviting you to collect from the depot or re-arrange delivery.

If it proves impossible to deliver your goods within the time allowed by our contract carriers, the consignment will be returned to us and you will unfortunately become liable for all redelivery, and/or redirection charges. Please check your confirmation email for the status of your goods before contacting us. Should you need to change your details, for example you have moved house, you can change your details by contacting customer services on 0207 636 1481 or by email at info@ivormairants.co.uk and the new information will be updated within 24 hours. Please note that any orders placed before changes are made will use your old details.

Can I track my order?
The vast majority of our UK and Eire domestic consignments and international shipments are by trackable service. You will be emailed a tracking number with your dispatch information. Please note that tracking numbers are not used for smaller orders sent by Royal Mail or similar postal service. If you require your order to be consigned using a trackable service, please advise us AT THE POINT OF ORDER.



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