KR Audio
KT88 Vacuum Tube
$800.00 USDPay Over Time
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Features
Low-frequency power beam tetrode built for exceptional durability and reliability
Wide, deep soundstage with precise imaging and lifelike instrument/vocal presentation
Inherent linearity and low distortion for an engaging, true-to-recording listen
Compatible with single-ended and push-pull amplifier configurations
Versatile for hi-fi systems, tube amps, and guitar amplifiers (Ampeg, Marshall, etc.)
Rigorously tested and quality-controlled for consistent, optimal performance
Combines vintage KT88 heritage with modern manufacturing advancements
What's in the Box?
The KR Audio KT88 Tube Pair is a low-frequency power beam tetrode that delivers an impressive 15-25 watts of pure class-A power per tube. Designed for audiophiles and music enthusiasts who demand the very best in sound quality and performance, these power tubes are the perfect choice for those seeking to elevate their audio experience to new heights. The KR Audio KT88 Tube Pair is meticulously crafted using the finest materials and state-of-the-art manufacturing techniques, ensuring exceptional durability and reliability. Each tube undergoes rigorous testing and quality control measures to guarantee optimal performance and consistency, making them a trusted choice for discerning audio enthusiasts.
With their remarkable power output of 15-25 watts per tube in pure class-A operation, the KR Audio KT88 tubes provide ample headroom and dynamic range, allowing your amplifier to effortlessly handle even the most demanding musical passages. This robust power delivery, combined with the KT88's inherent linearity and low distortion, results in a listening experience that is both engaging and true to the original recording. The KR Audio KT88 Tube Pair excels at reproducing music with exceptional clarity, warmth, and detail. These tubes offer a wide and deep soundstage, precise imaging, and a natural, lifelike presentation of instruments and vocals. Whether you're enjoying your favorite jazz trio, a symphony orchestra, or a rock band, the KT88 tubes deliver a captivating and immersive audio experience.
The versatility of the KR Audio KT88 Tube Pair makes them suitable for a wide range of amplifier designs, from single-ended to push-pull configurations. Their compatibility with various circuit topologies allows audio engineers and DIY enthusiasts to explore the full potential of these exceptional power vacuum tubes in their projects. Perfect for tube amps, guitar amplifiers (Ampeg, Marshall, etc.), and hi-fi systems, the brand new KT88 tubes reissue brings the best of both vintage and modern sound to your preamp or power amp setup. Made in the Czech Republic, these tubes stand out for their superior performance and reliability, making them a valuable addition to any high-fidelity audio system.
A Short History of the KT88
The KT88 tube has a storied history and an enduring popularity among audiophiles and music enthusiasts. Introduced in 1956 by the British company GEC (General Electric Company), the KT88 was designed to compete with the American 6550 tube, offering higher power output and improved performance characteristics. Its robust construction and high power-handling capabilities made it an immediate favorite in the world of high-fidelity audio.
Over the decades, the KT88 became synonymous with powerful, clear, and dynamic sound, making it a staple in many high-end tube amplifiers. Audiophiles particularly appreciate the KT88 for its ability to deliver rich, warm tones with excellent midrange clarity and extended bass response. This tube's sonic qualities are especially prized in both stereo and monoblock amplifier configurations, where its high output and low distortion can be fully appreciated.
The KT88's popularity surged again in the late 20th and early 21st centuries with the revival of interest in vacuum tube audio equipment. Modern manufacturers such as KR Audio, JJ Electronic, Electro-Harmonix, Telefunken, and Shuguang have continued to produce high-quality KT88 tubes, ensuring their availability for contemporary audio enthusiasts. These new production tubes maintain the legacy of their predecessors while incorporating advancements in materials and manufacturing techniques to enhance reliability and performance.
Audiophiles often seek out the KT88 (KR Audio KT88, JJ KT88, Mullard KT88, Genalex Gold Lion KT88, KT88-T) for its ability to bring out the best in high-fidelity audio systems, whether for listening to vinyl records, streaming high-resolution audio, or enhancing the sound of electric guitars and basses. Its versatility and superior sound quality have cemented the KT88's place as a legendary component in the audiophile community, continuing to inspire and satisfy listeners around the world.
KR Audio WARRANTY ON TUBES ONLY
Please take a moment to return your warranty registration form included with the tubes. Unregistered KR tubes will not be warranted. Customers must return the warranty registration when the tubes have been received.
KR Audio Electronics will respect valid warranty claims. Incorrect claims or late warranty registration will void any guarantee. KR Audio Electronics will replace the tube provided the following conditions are met:
- The tubes were used according to the technical data sheet enclosed with the KR tube.
- Abuse, accident or unauthorized use of the tube will be determined by KR Audio Electronics.
- All tubes to be returned with the original factory box and warranty.
- To obtain a replacement for a faulty tube, KR Audio Electronics reserves the right to obtain dealer or distributor authorization prior to shipping products pre-paid back to us.
KR Audio Electronics gives a one-year warranty for your tube from the date of purchase. The purchase date should be written or stamped by the dealer or distributor on the day you buy the tube. Only expert technicians can change the work point of the tube. Improper use of the tube or incorrect application of the tube to a circuit cannot be covered by our warranty.
Moon Audio Tube Testing Process
Our high-end audio systems achieve sonic purity through the use of carefully selected NOS vacuum tubes. We take time to search for NOS tubes, understanding their unique potential for audio reproduction. Each tube is rigorously tested using legendary HICKOK 800K 600K Dynamic Mutual Conductance Tube Tester and TV7-A/U Vacuum Tube Testers to measure critical parameters, including mutual conductance, emission, and gas levels. By precisely matching tubes based on these measurements, we deliver balanced, dynamic, and lifelike audio that elevates your listening experience to an art form.
FAQ
What is a KT88 tube?
The KT88 is a beam tetrode vacuum tube known for its high power output and excellent sound quality, often used in high-fidelity audio amplifiers and some guitar amps.
How does the KT88 compare to the 6550 tube?
The KT88 typically offers higher power output, better bass response, and a warmer sound compared to the 6550, which is often more neutral and has a slightly different tonal character.
What are the best KT88 tubes available today?
Popular KT88 tubes include those made by JJ Electronic, KR Audio, Electro-Harmonix, Tung-Sol, and Gold Lion, each offering variations in tonal characteristics and build quality. We think the version by KR Audio is one of the best on the market.
Can I use KT88 tubes in my amplifier?
It depends on your amplifier's design and specifications. Many amplifiers can use KT88 tubes, but it’s important to check with the manufacturer or refer to the amplifier's manual.
What is the typical lifespan of a KT88 tube?
With proper use and maintenance, a KT88 tube can last between 2,000 to 5,000 hours, though this can vary based on factors such as usage patterns and amplifier settings.
How do KT88 tubes affect sound quality?
KT88 tubes are known for their rich, warm sound with excellent midrange clarity and powerful bass. They enhance the overall sound quality by providing detailed and dynamic audio reproduction.
Are KT88 tubes interchangeable with EL34 tubes?
No, KT88 and EL34 tubes are not directly interchangeable due to differences in pin configuration, power requirements, and electrical characteristics. However, some amplifiers are designed to accommodate both with adjustments.
How do I bias KT88 tubes in my amplifier?
Biasing KT88 tubes requires setting the correct bias voltage according to your amplifier’s specifications. It’s best done using a multimeter and following the amplifier manufacturer’s instructions or by a qualified technician.
What are the signs that my KT88 tubes need replacing?
Signs that KT88 tubes may need replacing include a noticeable drop in sound quality, increased noise or distortion, reduced output power, or visible signs of wear and tear such as discoloration or internal component damage.
| Parameter | Specification |
|---|---|
| Technical Specifications | |
| Filament Voltage | 6.3 V (DC/AC) |
| Filament Current | 1.6 A |
| Amplification Factor | 8 |
| Maximum Ratings | |
| Maximum Plate Voltage | 800 V |
| Maximum Plate Current | 230 mA |
| Plate Dissipation | 50 Watts |
| Operating Specifications | |
| Bias Voltage (at 250V/140mA) | -15 V |
| Performance Specifications | |
| Transconductance | 10.5 mA/V |
- RVRudolf V.Verified BuyerRated 5 out of 5 stars1 year agoGood Buy - Good Delivery
Superb KT88 tube, highest musicality
- JNJohn N. K.Verified BuyerRated 3 out of 5 stars7 years agoInconsistent quality and therefore only for the rich!
I purchased 16 of these for my VAC Statement amps in two locations. There’s no question that they improved the sound significantly; however I had to weed out four bad ones over a period of two months. Were they under warranty? Yes. The problem is that the return policy is designed to discourage returns; and what’s the point in selling them in “matched” quads if you're going to replace them one at a time?