Telefunken KT88-TK Beam Power Tetrode Vacuum Tube, Pair

The Telefunken KT88-TK Matched Pair delivers exceptional power, warmth, and clarity for tube amplifiers. Each tube is precisely tested and matched for optimal balance, ensuring even output and consistent sonic performance in high-fidelity and musical instrument applications.

Built as part of Telefunken’s Black Diamond Series, these KT88-TK tubes are cryogenically treated and burned in for reliability and tonal stability. They combine classic KT88 characteristics—rich harmonics, detailed highs, and tight low-end response—with modern construction for improved durability and consistency.

Ideal for both guitar amps and audiophile hi-fi systems, the KT88-TK matched pair offers the power, headroom, and precision needed to drive output stages with accuracy and smooth dynamics.

Key Features

• Matched pair of premium KT88-TK beam-power tetrode vacuum tubes
• Hand-tested, cryogenically treated, and burn-in certified
• High-power design with low distortion and extended frequency response
• Optimized for guitar amplifiers, hi-fi systems, and power amp output stages
• Rugged construction with long operating life
• Part of Telefunken’s Black Diamond Series

Technical Specifications

• Tube Type: Beam-power tetrode (KT88 family)
• Base: Octal (8-pin)
• Heater Voltage: 6.3 V
• Heater Current: 1.6 A
• Maximum Plate Voltage: 800 V
• Maximum Plate Dissipation: 42 W
• Maximum Screen Voltage: 600 V
• Maximum Screen Dissipation: 8 W
• Transconductance: ~11 mA/V
• Amplification Factor: 8
• Plate Resistance: ~15 kOhm
• Typical Operating Conditions: Plate 400 V, Screen 300 V, Control Grid -55 V
• Typical Plate Current: ~140 mA
• Output Power (Class AB1): ~50 W per pair in push-pull configuration
• Frequency Response: Extended low and high frequency range with smooth midrange
• Applications: Hi-fi power amps, bass amps, and high-output guitar amplifiers

What's in the Box

• 2x Telefunken KT88-TK Vacuum Tube