Vacuum Tube - 6550, Electro-Harmonix

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Vacuum Tube - 6550, Electro-Harmonix

Starting at: $35.25
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Superior high-power Octal Beam Tetrode, suitable for any amp using 6550 or KT88. Designed to hold up in even the most punishing environment of high powered bass amps, such as Ampeg SVT. With 42 watts of plate dissipation in tetrode operation and 44 watts in triode, power is improved even over desirable vintage types.

  • Thanks to extra headroom, bass players can realize the full dynamic and tonal range of the instrument
  • Nickel steel side rod mica supports sweet tone regardless of setup, even in combos where the tube is only inches from the speaker
  • Also suitable for hifi use
  • KT88 equivalent
RoHS Compliant
Item ID:
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Matched PairT-6550-EH-MP609722128339
Matched QuadT-6550-EH-MQ609722128346
Matched SextetT-6550-EH-MS609722128353
Product Measurements
Bulb Temperature250°C
Capacitance, Grid to Others18 pF
Capacitance, Plate to Others12.5 pF
Capacitance, grid to plate0.88 pF
Cathode Current, Tetrode230 mA
Cathode Current, Triode190 mA
Grid Circuit Resistance (Rg), Fixed Bias50 kΩ
Grid Circuit Resistance (Rg), Self Bias0.24 MΩ
Heater Current1.6 A
Heater Voltage6.0 V - 6.5 V
Heater to Cathode Voltage300 V, -200 V
Plate Dissipation, per tetrode (Wa)42 W
Plate Dissipation, per triode (Wa)44 W
Plate Resistance (Ra)14.8 kΩ
Plate Voltage, tetrode (Ua)800 V
Plate Voltage, triode (Ua)440 V
Screen Dissipation6.6 W
Screen Voltage440 V
Transconductance (S)11.2 mA/V
Packaging Information
Packaging DimensionsMatched Pair version5.5 in. × 4.25 in. × 2 in.
Matched Quad version5.8 in. × 4.3 in. × 4.3 in.
Matched Sextet version6.25 in. × 5.5 in. × 4.25 in.
Single version2.2 in. × 2.2 in. × 5.8 in.
Weight (Packaging)Matched Pair version0.48 lbs.
Matched Quad version0.96 lbs.
Matched Sextet version1.44 lbs.
Single version0.24 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet163.02 KB

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Product Reviews

5.00 out of 5 based on 1 reviews
- October 7th, 2011
5 out of 5

Check any review, at just about any site. This is Probably THE most respected new production 6550/KT88 for HI-FI, Leslie's or Hammond or Wurlitzer Amplifier circuits. These tube just flat out Kick Ass.

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