Vacuum Tube - KT66, Genalex Gold Lion

Vacuum Tube - KT66, Genalex Gold Lion image 1
Customer image:<br/>"Siegmund Midnight Special Head 30 Watts"
Customer image:<br/>"Siegmund ST-230 Stereo"
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Vacuum Tube - KT66, Genalex Gold Lion image 1
Customer Images:
Customer image: "Siegmund Midnight Special Head 30 Watts"Customer image: "Siegmund ST-230 Stereo"

Vacuum Tube - KT66, Genalex Gold Lion

Starting at: $37.95
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Originally: $40.95
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Super Premium power beam tetrode & exact copy of the original clear glass KT66, used in the early Marshall amps which created Eric Clapton’s "Bluesbreaker" Tone.” Full sound with improved bass response and shimmering top-end.

  • Originally a British equivalent to 6L6 and a mainstay of the British hi-fi industry
  • Used in 50s - 60s hi-fi favorites such as the Heath W-5M and many Leak amplifiers
Item ID:
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Matched PairT-KT66-GEN-MP841358102530
Matched QuadT-KT66-GEN-MQ841358102547
Product Measurements
Body Height111 - 121 mm
Capacitance, Grid 1 to All16 pF
Capacitance, Plate to All11.5 pF
Capacitance, Plate to Grid 11.1 pF
Grid 2 Voltage≤ 400 V
Grid Power Dissipation3.5 W
Heater Current1.27 A
Heater Voltage6.3 V
Item Diameter53 mm
Item Height125 - 135 mm
Plate Dissipation (Wa)25 W
Plate Resistance (Ra)22.5 kΩ
Plate Voltage (Ua)≤ 500 V
Transconductance (S)6.3 mA/V
Packaging Information
Packaging DimensionsMatched Pair version5.53 in. × 4.41 in. × 2.26 in.
Matched Quad version5.53 in. × 4.41 in. × 4.48 in.
Single version5.5 in. × 2.25 in. × 2.25 in.
Weight (Packaging)Matched Pair version1.76 lbs.
Matched Quad version0.86 lbs.
Single version0.215 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet2.53 MB

Questions and Answers

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Asked by Anonymous on January 6th, 2019. 1 person subscribed to this question
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January 9th, 2019
Staff Member
According to the data sheet, the max plate voltage is 500V.
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Product Reviews

5.00 out of 5 based on 1 reviews
Bob Brodie - June 4th, 2019

This pair of Gold Lion KT66 output tubes replaced a pair of Valve Art KT66 where one shorted out in a JTM45 clone that I build and put into a 1x12 combo cabinet. They sound great and are shorter that than the Valve Art tubes so they fit better in a tighter space giving a little more clearance. I highly recommend them.

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