Vacuum Tube - KT66, JJ Electronics

JJ Electronics
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Vacuum Tube - KT66, JJ Electronics

Starting at: $39.95
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The JJ Electronic KT66 is a sonically faithful reproduction of the original tubes with a robust construction encased in a thick glass envelope. The JJ KT66 delivers a powerful 25 Watts with plenty of headroom. This tube has a tone that is warm, thick, and straightforward. With a more balanced sound than the 6L6GC, the JJ KT66 is an excellent choice for a full bodied tone.

Apex Tube Matching
Matched versions of this tube use Apex Matching
RoHS Compliant
Item ID:
JJ Electronics, Apex Matched
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Apex Matched PairT-KT66-JJ-MP609722123136
Apex Matched QuadT-KT66-JJ-MQ609722123143
Product Measurements
Body Height110 mm
Cathode Current (Ik)≤ 150 mA
Filament Current (If)1.3 A
Filament Voltage (Uf)6.3 V
Grid 1 voltage (Ug1)≥ -200 V, -15 V typical
Grid 2 current (Ig2)≤ 7 mA
Grid 2 dissipation (Wg2)3.5 W
Grid 2 voltage (Ug2)≤ 550 V, 250 V typical
Grid capacitance (cg1)16 pF
Grid to Plate Capacitance (ca/g)2.3 pF
Internal Resistance (Ri)22.5 kΩ
Item Diameter52 mm
Item Height125 mm
Plate Capacitance (ca)10 pF
Plate Current (Ia)85 mA
Plate Dissipation (Wa)≤ 25 W
Plate Voltage (Ua)≤ 550 V, 250 V typical
Transconductance (S)6 mA/V
Packaging Information
Packaging DimensionsApex Matched Pair version5.3 in. × 4.5 in. × 2.3 in.
Apex Matched Quad version5.3 in. × 4.5 in. × 4.5 in.
Single version2.3 in. × 2.3 in. × 5.3 in.
Weight (Packaging)Apex Matched Pair version0.512 lbs.
Apex Matched Quad version1.024 lbs.
Single version0.256 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet569.46 KB

Questions and Answers

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Asked by Gorgut on January 6th, 2019.
January 9th, 2019
Staff Member
The example I measured had a diameter of 2.06" so the data sheet is accurate. I will have that information updated.

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