Telefunken KT88-TK Black Diamond Series Vacuum Tubes (Matched Pair)

Telefunken KT88-TK Black Diamond Series Vacuum Tubes (Matched Pair)

Telefunken KT88-TK Black Diamond Series Vacuum Tubes (Matched Pair)

B&H # TEMPKT88TK MFR # MATCHED PAIR OF KT88-TK
Special Order
Expected availability: 7-14 business days

Product Highlights

  • Beam-Power Tetrode Output Tubes
  • Ideal for Guitar & Power Amplifiers
  • High Power & Low Distortion
  • Handles Plate Voltage up to 800V
  • Signature KT88 Midrange
  • Expanded Low & High Frequencies
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Configuration: Matched Pair

Matched Pair Single Tube

Special Order

This item is noncancelable and nonreturnable.

$0.00 Tax Collected Outside NY and NJ

You Pay: $168.00

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Telefunken MATCHED PAIR OF KT88-TK overview

  • 1Description

This matched pair of Telefunken KT88-TK Black Diamond Series Vacuum Tubes 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, they grant the signature KT88 midrange with the added benefit of expanded low and high frequencies. Among the largest in their class, these beam-power tetrode tubes deliver high power and low distortion while handling plate voltages up to 800V. Depending on the circuit type, they can be used as beam-power tetrodes or output-beam pentodes.

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
Table of Contents
  • 1Description

Telefunken MATCHED PAIR OF KT88-TK specs

Mechanical
Type A.F. beam pentode
Base Octal
Number of Pins 7
Heater Requirements
Voltage 6.3 V
Current 1.6 A
Direct Interelectrode Capacitances
Capacitance Grid #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
Voltage Plate 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
Current Cathode Current: 230 mA
Dissipation Plate Dissipation: 42 W
Grid #2 Dissipation: 8 W
Typical Operation and Characteristics
Voltage Plate 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
Current Plate Current (Pentode Connection): 140 mA
Grid #2 Current (Pentode Connection): 7 mA
Plate to Grid #2 Current (Triode Connection): 147 mA
Transconductance Pentode Connection: 11.5 mA/V
Triode Connection: 12 mA/V
Resistance Internal Plate Resistance (Pentode Connection): 12 kOhms, approximate
Internal Plate Resistance (Triode Connection): 670 Ohms
Amplification Amplification Factor (Pentode Connection): 8
Amplification Factor (Triode Connection): 8
Physical Characteristicsrsyzasdtfvsvtwwxwd
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)
Weight 4 oz / 113.4 g

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