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Single-Ended (SE) KT88 Tube Amp Schematic


Mikael Abdellah's Single-Ended (SE) KT88 Tube Amplifier Schematic

The popular single-ended (se) KT88 tube amplifier schematic by Mikael Abdellah. A 6DJ8 / ECC88 tube can be used in place of the 6N1P tube with good results.

KT88 Single Ended (SE) Tube Amplifier Schematic

Mikael Abdellah KT88 Single-Ended Tube Amplifier Schematic

Output power will be about 5W. The 470 ohm cathode resistor sets bias at a 75mA which is only about 68% of the maximum plate dissipation so expect long tube life with this amp. Choose a good quality audio output transformer with a 5k primary and rated for at least 10W. With various KT88 amplifiers we have had good results using the new production JJ KT88 Blue Glass and Genalex - Gold Lion KT88 tubes.


DIY Single-Ended (SE) KT88 Tube Amplifier

The photos below are of Bernardo's DIY Single-Ended KT88 Tube Amplifier following Mikael Abdellah's schematic. Tube compliment in the photos is a Sovtek 6N1P in the driver position and a pair of matched Electro-Harmonix KT88EH in the output positions. See the SE KT88 Tube Amplifier thread by Bernardo for additional details about his build.

DIY Single-Ended KT88 Tube Amplifier

DIY Single-Ended KT88 Tube Amplifier

DIY Single-Ended KT88 Tube Amplifier

Rear View - DIY Single-Ended KT88 Tube Amplifier

DIY Single-Ended KT88 Tube Amplifier

Underside View - DIY Single-Ended KT88 Tube Amplifier

More Single-Ended KT88 and 6550 Tube Amplifiers