Vacuum Tube - KT88-STR, Tube Amp Doctor, Premium Selected

Tube Amp Doctor (TAD)
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Vacuum Tube - KT88-STR, Tube Amp Doctor, Premium Selected

Starting at: $49.25
Product Options
  • Matched Quad
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The Tube Amp Doctor KT88-STR is build just like the original tube with its thick curved glass envelope and metal base. The similarities don’t stop with its attractive appearance. This KT88 offers a lively and dynamic tone that is ideal in both HiFi audio amplifiers and high wattage guitar / bass amps. The sound of the TAD KT88 is pleasantly warm at all frequencies with detailed mids, articulate and nuanced highs, and harmonically rich and natural lows. The linear response is excellent. The TAD KT88-STR is matched for both plate current and transconductance and passes all of the tests of the TAD Premium Selection process.

RoHS Compliant
Item ID:
Tube Amp Doctor (TAD)
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Matched PairT-KT88-STR-TAD-MP
Matched QuadT-KT88-STR-TAD-MQ
Product Measurements
Body Height103 mm
Bulb Temperature250°C
Cathode to Heater Voltage≤ 250 V
D.C. Cathode Current, AF Power Amplifier230 mA
D.C. Plate Voltage, AF Power Amplifier800 V
Grid 1 (control) Voltage, Af Power Amplifier-300 V
Grid 1 Control Voltage, Class A1-16.5 V
Grid 1 to Cathode, Grid 3, Grid 2, Base Sleeve, Heater Capacitance< 17 pF
Grid 1 to Plate Capacitance< 1.3 pF
Grid 2 Dc (screen) Dissipation, Af Power Amplifier8 W
Grid 2 Dc (screen) Voltage, Af Power Amplifier600 V
Grid 2 Screen Voltage, Class A1225 V
Heater Current1.6 A
Heater Voltage5.8 V - 6.8 V, 6.3 V nominal
Item Diameter52 mm
Item Height114 mm
Load Resistance6 kΩ
Output Power (POut) @ 5% Distortion19 W
Peak AF Grid 1 Control Voltage16.5 V
Plate Dissipation, AF power amplifier (Wa)42 W
Plate Voltage, class A1 (Ua)400 V
Plate to Cathode, Grid 3, Grid 2, Base Sleeve, Heater Capacitance< 12 pF
Signal Plate Current, Class A1, maximum105 mA
Transconductance (S)9 mA/V
Zero Signal Plate Current, Class A187 mA
Packaging Information
Packaging DimensionsMatched Pair version2 in. × 4 in. × 4.8 in.
Matched Quad version2 in. × 8 in. × 4.6 in.
Single version6 in. × 2.5 in. × 2.5 in.
Weight (Packaging)Matched Pair version0.514 lbs.
Matched Quad version1.028 lbs.
Single version0.257 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet946.13 KB

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