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KT88 valves tubes for sale

1 x KT88 Power ValveUnleash Massive Headroom and Bold Dynamics with the JJ Electronics KT88 Valve

The JJ Electronics KT88 valve is a formidable high-output beam power tetrode engineered for serious power delivery, delivering commanding clean headroom, thunderous yet controlled bass, and sparkling high-end clarity that professionals demand. This premium octal-base power tube fuses iconic British GEC heritage with modern Slovakian engineering, making it the ultimate choice for high-wattage guitar amplifiers, bass rigs, and reference hi-fi systems. On this dedicated category page, explore our complete range of tested and matched JJ KT88 valves – available as singles, matched pairs, matched quads and larger power-tube sets – all with precise matching and fast UK delivery from Amp Valves.

Launched by Britain’s GEC in 1956 as a high-performance evolution of the legendary KT66, the KT88 rapidly became the benchmark for amplifiers requiring substantial output and dynamic authority. JJ Electronic has faithfully recreated this classic design using today’s advanced manufacturing processes, producing a valve that honours the original bold character while delivering superior consistency, longevity and batch-to-batch reliability far beyond many vintage NOS options.

Why Choose JJ Electronics KT88 Valves?

JJ Electronic’s renowned quality control, computer-precise matching and stable bias characteristics ensure every set performs at its peak straight from the box. Users consistently report outstanding longevity, minimal drift and professional-grade reliability at a competitive price point.

Harness the full potential of your amplifier today with premium matched JJ KT88 valves. Browse our carefully selected power tube kits and experience the commanding presence, dynamic brilliance and sonic authority that have made the KT88 a true modern classic.

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Why buy your new valves from Ampvalves?
all valves tested and digitally matched
  • Amazing Quality - All our valves have been tested to the highest possible standard using the best testing equipment on the market.
  • 100% Guarantee - All of our valves are fully guaranteed for complete peace of mind.
  • Soak Testing - All of our valves are soak-tested for 30 minutes to reduce failures after fitting.
  • Rated 5 Stars on Trustpilot
  • Awesome Tone - You'll hear the difference. A new set of tubes will get your amp sounding and performing like new.
  • Stunning Price - Our individual Valves and complete Amp Kits are competitively priced to ensure you get great value.
  • Superb Customer Service - We are always at the end of the phone to answer any questions you may have. We are all guitarists here and treat every customer as we would like to be treated.
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