Telefunken KT88-TK Black Diamond Series Vacuum Tube

BH #TEKT88TK • MFR #KT88-TK
Telefunken
Telefunken KT88-TK Black Diamond Series Vacuum Tube
Key Features
  • Beam-Power Tetrode Output Tube
  • Ideal for Guitar & Power Amplifiers
  • High Power & Low Distortion
  • Handles Plate Voltage up to 800V
The Telefunken KT88-TK Black Diamond Series Vacuum Tube is ideal for use in guitar amplifiers and hi-fi power amps in homes, studios, and live stage applications. For personal enjoyment or commercial recording, it grants the signature KT88 midrange with the added benefit of expanded low and high frequencies. Among the largest in its class, this beam-power tetrode tube delivers high power and low distortion while handling plate voltages up to 800V. Depending on the circuit type, it can be used as a beam-power tetrode or an output-beam pentode.
Special Order
Expected availability: 2-4 weeks
$91.00
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Important Notice

  • This item is noncancelable and nonreturnable.
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Telefunken KT88-TK Overview

The Telefunken KT88-TK Black Diamond Series Vacuum Tube is ideal for use in guitar amplifiers and hi-fi power amps in homes, studios, and live stage applications. For personal enjoyment or commercial recording, it grants the signature KT88 midrange with the added benefit of expanded low and high frequencies. Among the largest in its class, this beam-power tetrode tube delivers high power and low distortion while handling plate voltages up to 800V. Depending on the circuit type, it can be used as a beam-power tetrode or an output-beam pentode.

Newly manufactured and cryogenically treated version of the legendary KT88
Beam-power tetrode tube design similar to the 6L6 and EL34
Great for guitar amps and hi-fi power amplifiers
One of the largest tubes in its class
Handles plate voltages up to 800V
High power and low distortion make it ideal for scenarios where higher gain with less distortion than a 6550 is desired
Yields the characteristic midrange of the original KT88 manufactured by MOV (Marconi-Osram Valve) plus expanded low and high frequencies
Each tube is meticulously measured for all critical parameters of performance including transconductance, gain, noise, and microphonics
Tubes are selected by hand, rigorously tested, subjected to an extended burn-in period for stability, and remeasured before final packing
UPC: 858513005025

Telefunken KT88-TK Specs

Mechanical
TypeA.F. beam pentode
BaseOctal
Number of Pins7
Heater Requirements
Voltage6.3 V
Current1.6 A
Direct Interelectrode Capacitances
CapacitanceGrid #1 to All Except Plate: 16.5 pF
Plate to All Except Grid #1: 10 pF
Plate to Grid #1: 2.3 pF
Maximum Ratings
VoltagePlate Voltage: 800 V
Grid #2: 600 V
Plate to Grid #2 Voltage: 600 V
Grid #1 Voltage (Negative Bias Value): -200 V
Cathode to Filament Voltage: 250 V
CurrentCathode Current: 230 mA
DissipationPlate Dissipation: 42 W
Grid #2 Dissipation: 8 W
Typical Operation and Characteristics
VoltagePlate Voltage (Pentode Connection): 250 V
Grid #2 Voltage (Pentode Connection): 250 V
Grid #1 Voltage (Pentode Connection): -15 V
Grid #1 Voltage (Triode Connection): -15 V
Plate to Grid #2 Voltage (Triode Connection): 250 V
CurrentPlate Current (Pentode Connection): 140 mA
Grid #2 Current (Pentode Connection): 7 mA
Plate to Grid #2 Current (Triode Connection): 147 mA
TransconductancePentode Connection: 11.5 mA/V
Triode Connection: 12 mA/V
ResistanceInternal Plate Resistance (Pentode Connection): 12 kOhms, approximate
Internal Plate Resistance (Triode Connection): 670 Ohms
AmplificationAmplification Factor (Pentode Connection): 8 µ
Amplification Factor (Triode Connection): 8 µ
Physical Characteristics
Dimensions (H x Diam.)4.33 x 2.04" / 110 x 52 mm (excluding pins)
4.92 x 2.04" / 125 x 52 mm (including pins)
Weight4 oz / 113.4 g
Packaging Info
Package Weight0.35 lb
Box Dimensions (LxWxH)6.3 x 2.3 x 2.3"
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