Vacuum Tube - KT66, Tube Amp Doctor, Premium Selected

Tube Amp Doctor (TAD)
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Vacuum Tube - KT66, Tube Amp Doctor, Premium Selected

Starting at: $27.95
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The Tube Amp Doctor KT-66 is an incredible remake of the classic British tube. With its large glass envelope contoured by smooth curves tapering into a rounded brown base, the TAD KT-66 not only looks like the original, it performs like the original. This KT66 offers plenty of headroom for a thick full bodied sound with smooth yet articulate highs. The KT-66 is famously used in vintage British plexi amps and makes a great replacement for that style of amplifier and many others. The TAD KT66 is matched for both plate current and transconductance and passes all of the tests of the TAD Premium Selection process. The TAD KT-66 can be used in any KT-66 position as well as 6L6GC and 5881 amps that can supply the required 1.27A for the heater.

RoHS Compliant
Item ID:
Tube Amp Doctor (TAD)
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Matched PairT-KT66-TAD-MP
Matched QuadT-KT66-TAD-MQ
Product Measurements
Body Height116 mm
Cathode to Heater Voltage≤ 150 V
D.C. Cathode Current, AF Power Amplifier100 mA
D.C. Plate Voltage, AF Power Amplifier500 V
Grid 1 (control) Voltage, Af Power Amplifier-300 V
Grid 1 Control Voltage, Class A1-15 V
Grid 1 to Cathode, Grid 3, Grid 2, Base Sleeve, Heater Capacitance< 16 pF
Grid 1 to Plate Capacitance< 1.1 pF
Grid 2 Current, Class A15 mA
Grid 2 Dc (screen) Dissipation, Af Power Amplifier3.5 W
Grid 2 Dc (screen) Voltage, Af Power Amplifier400 V
Grid 2 Screen Voltage, Class A1250 V
Heater Current1.27 A
Heater Voltage5.8 V - 6.8 V, 6.3 V nominal
Item Diameter51 mm
Item Height129 mm
Load Resistance, Class A12.2 kΩ
Output Power (POut) @ 5% Distortion, Class A17.25 W
Peak Input Grid 1 Voltage15 V
Plate Current, class A1 (Ia)82 mA
Plate Dissipation, AF power amplifier (Wa)25 W
Plate Voltage, class A1 (Ua)250 V
Plate to Cathode, Grid 3, Grid 2, Base Sleeve, Heater Capacitance< 11.5 pF
Transconductance, Class A1 (S)8.5 mA/V
Packaging Information
Packaging DimensionsMatched Pair version2 in. × 4 in. × 4.8 in.
Matched Quad version2 in. × 4 in. × 4.8 in.
Single version6 in. × 2.5 in. × 2.5 in.
Weight (Packaging)Matched Pair version0.416 lbs.
Matched Quad version0.832 lbs.
Single version0.208 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet380.5 KB

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