Vacuum Tube - KT66, Tung-Sol Reissue

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Vacuum Tube - KT66, Tung-Sol Reissue

Starting at: $35.95
In stock

Premium power beam tetrode, a reissue of the famous “Bluesbreaker” tube. Full tone with plenty of chime and powerful bass.

  • High quality & cost-effective
  • 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
RoHS Compliant
Item ID:
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Matched PairT-KT66-TUNG-MP609722129619
Matched QuadT-KT66-TUNG-MQ609722129626
Product Measurements
Capacitance, Grid to Cathode10 pF
Capacitance, Grid to Heater10 pF
Capacitance, Grid to Screen10 pF
Capacitance, Grid to Suppressor10 pF
Capacitance, Plate to Cathode6.4 pF
Capacitance, Plate to Heater6.4 pF
Capacitance, Plate to Screen6.4 pF
Capacitance, Plate to Suppressor6.4 pF
Capacitance, grid to plate0.6 pF
Cathode Current (Ik)80 mA
Grid Circuit Resistance (Rg), Fixed Bias100 kΩ
Grid Circuit Resistance (Rg), Self Bias0.5 MΩ
Heater Current0.9 A
Heater Voltage5.7 V - 5.9 V
Heater to Cathode Voltage± 200 V
Plate Dissipation (Wa)30 W
Plate Resistance (Ra)33 kΩ
Plate Voltage (Ua)500 V
Screen Dissipation5 W
Screen Voltage450 V
Transconductance (S)5.2 mA/V
Packaging Information
Packaging DimensionsMatched Pair version5.8 in. × 4.3 in. × 2.3 in.
Matched Quad version5.8 in. × 4.5 in. × 4.5 in.
Single version2.3 in. × 2.3 in. × 5.5 in.
Weight (Packaging)Matched Pair version0.44 lbs.
Matched Quad version0.88 lbs.
Single version0.22 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet460.3 KB

Questions and Answers

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Asked by Anonymous on November 22nd, 2018.
November 28th, 2018
Staff Member
KT66s are another tube in the 6L6 family and can be used in place of a 6L6 or variations of that tube.

Product Reviews

5.00 out of 5 based on 1 reviews
- June 3rd, 2014
5 out of 5

I got a matched pair along with 3 tungsol 12ax7's for my Bugera 1960 Infinium and WOW!!!! I couldn't have been happier. Made my amp really come alive. Before switching to these i had a JJ's but the sound just wasn't there. I got this set after chatting with the online support guy. Huge help in deciding what type of tubes to go with. I highly recommend!!!!

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