Telefunken 6550-TK Black Diamond Series Vacuum Tubes (Matched Pair)

BH #TEMPR6550TK • MFR #6550-TK VACUUM TUBE MATCHED PAIR
Telefunken 6550-TK Black Diamond Series Vacuum Tubes (Matched Pair)
Key Features
  • Power Tetrode Output Tubes
  • Ideal for Guitar & Bass Amplifiers
  • Great for Leslie Cabinets
  • Delivers up to 35W of Output Power
This matched pair of Telefunken 6550-TK Black Diamond Series Vacuum Tubes is ideal for use in Leslie cabinets and guitar, bass, and keyboard amplifiers in homes, studios, and live stage applications. For personal enjoyment, live performance, or commercial recording, they grant the essence of a 6L6 with increased gain and enhanced stability. In a slightly larger footprint than a 6L6, each beam pentode (or power tetrode) tube delivers up to 35W of output power and extended longevity.
Back-Ordered
Expected availability: Feb 01, 2021
$171.00

Important Notice

  • This item is noncancelable and nonreturnable.
Merry A., B&H Pro Audio Expert

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Telefunken 6550-TK VACUUM TUBE MATCHED PAIR Overview

This matched pair of Telefunken 6550-TK Black Diamond Series Vacuum Tubes is ideal for use in Leslie cabinets and guitar, bass, and keyboard amplifiers in homes, studios, and live stage applications. For personal enjoyment, live performance, or commercial recording, they grant the essence of a 6L6 with increased gain and enhanced stability. In a slightly larger footprint than a 6L6, each beam pentode (or power tetrode) tube delivers up to 35W of output power and extended longevity.

Ideal for use in Leslie cabinets as well as guitar and bass amplifiers
Design based on the 6L6, but with more gain and enhanced stability
Inspired by the classic 6550, which was developed by Tung-Sol in 1955
Delivers up to 35W at the tube output
Extended longevity means fewer tube changes over the years
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

Telefunken 6550-TK VACUUM TUBE MATCHED PAIR 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: 14 pF
Plate to All Except Grid #1: 12 pF
Plate to Grid #1: 0.85 pF
Maximum Ratings
VoltagePlate Voltage: 600 V
Grid #2 Voltage: 400 V
Grid #1 Voltage (negative bias value): -300 V
Grid #1 Voltage (positive bias value): 0 V
CurrentCathode Current: 175 mA
DissipationPlate Dissipation: 35 W
Grid #2 Dissipation: 6 W
Typical Operation and Characteristics
VoltagePlate Voltage: 250 V
Grid #2 Voltage: 250 V
Grid #1 Voltage: -14 V
CurrentPlate Current: 140 mA
Grid #2 Current: 12 mA
Transconductance11.8 mA/V
ResistanceInternal Plate Resistance: 16 kOhms
Physical Characteristics
Dimensions (H x Diam.)4.33 x 1.69" / 110 x 43 mm (excluding pins)
4.92 x 1.69" / 125 x 43 mm (including pins)
Weight3 oz / 85 g
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