Vacuum Tubes

Premium Octal beam Tetrode, an exact copy of the KT88 valve manufactured by Marconi-Osram for Marshall in the late 1960s and 70s. Powerful, balanced and detailed soundstage with full bass.

• Direct replacement for any 6550 types
• Excellent replacement output valve for the Marshall Major, retains the original sound
• Equally well suited for hifi

The Svetlana KT88 is an excellent choice for users looking to upgrade their current KT88 tubes. This tube is a glass envelope beam power tetrode. It is intended for audio frequency power amplifiers. High plate dissipation, close manufacturing tolerances, and thorough processing provides improved reliability and superior sonic performance. The Svetlana KT88 is manufactured in the Svetlana factory in St.

The Shuguang KT88-98 vacuum tube is an octal based beam power tetrode that delivers lush harmonics and exceptional clarity for studio or stage. Renowned for its robust construction and exceptional sound quality, this KT88 tube is a staple for musicians and audiophiles alike seeking that classic tube warmth and clarity. Crafted with precision and expertise, the KT88-98 boasts a rich harmonic spectrum, delivering smooth highs, tight lows, and a lush midrange that breathes life into your music. Whether you're a seasoned professional or an avid enthusiast, these tubes ensure your sound reaches its fullest potential, with unparalleled reliability and consistency. Engineered for durability and longevity, the Shuguang KT88-98 tube is built to withstand the rigors of constant use, making it ideal for both studio recording and live performances.

The TAD KT88-STR Redbase® is built in the style of the early British MOV KT88 with the big and heavy glass envelope and beautifully polished metal base. The Redbase® features a gold control grid for outstanding performance and reliable stability. A breath-takingly big and precise tone and great appearance make the new TAD KT88-STR Redbase® the best choice for both, high-end audio applications and powerful bass guitar amps, providing a natural and three dimensional tone with pleasingly full warmth and fine, subtle highs. A very musical response, with great sound and finest details in mids and top-end; a linear and harmonious overall response with a very organic tone, make the TAD KT88-STR Redbase® TAD’s favorite tube in the KT88 and 6550A class.

The Psvane KT88 is a high quality, high power, beam tetrode with an octal base. The KT88C is notable for its warmth and clarity across the entire audio spectrum. The Psvane Classic Series is focused on the reproduction of popular vacuum tubes found in classic audio equipment. When designing the Classic Series, Psvane collected the most sought-after NOS tubes and analyzed each element of their construction, incorporating the most effective manufacturing techniques to produce stable tubes with excellent sound. Whether used in guitar amplifiers or hifi stereo systems, the Psvane Classic Series vacuum tubes excel in all applications. Psvane has been producing high quality vacuum tubes since 2011. The Psvane team originally formed in Shuguang’s high-end tube division but eventually split off to form their own brand. Psvane has since acquired their own manufacturing facilities with the goal of improving the production and performance of vacuum tubes.

Electro-Harmonix KT90 power tube. Made in Russia.
Absolutely the best KT90 ever developed. Wafer base height of 0.34”.

Genalex Gold Lion PX300B power triode tube with gold pins. Made in Russia. In Europe during the 1930s the GEC (Genalex)/Marconi-Osram PX4 and PX25 power triodes were considered the finest audio triodes of their day. In keeping with the tradition of Genalex to provide the highest quality tubes, New Sensor has released the Genalex Gold Lion PX300B audio power triode. This tube is the highest quality 300B type available and is considered to be an upgrade in any 300B amplifier.

This is a set of measured vacuum tubes for use in TV-7 vacuum tube tester calibration. The values for each vacuum tube will be measured and included for the purpose of calibrating your own TV-7 tester at home. Steps for this calibration can be found online. Three tubes will be included:

• 6L6
• 6AU6
• 12AT7

These tubes are tested at the following settings: Tube Filament Settings Bias Shunt Range 6L6 6.3 HS5-3481 23 0 D Tube Filament Settings Bias Shunt Range 6AU6 6.3 ET1-5672 16 0 B Tube Filament Settings Bias Shunt Range 12AT7 12.6 EV7-6080 10 0 C Note that brands are not guaranteed to match photograph.