PrimaLuna Replacement Vacuum Tubes 12AX7, 6922, 7025 - MORE STOCK ARRIVING LATE JULY 2025. Tube Compatibility All PrimaLuna amplifiers come equipped with either EL-34 or KT88 power tubes. However, you can substitute in any 6550, KT66, 6L6GC, 7581, KT90 or EL37 into any PrimaLuna amplifier. The ProLogue & DiaLogue One, Four, and Six amplifiers can use 6550 and KT88 tube types without any issues. The tubes will be running at a slightly cooler bias, but many customers have been using these higher dissipation tubes with great success. Each tube will have a different effect on the sound. Adaptive AutoBias will adjust itself to the new tube type, making experimenting with different power tubes very easy. In fact, the Adaptive AutoBias circuitry is so advanced you could even plug in one 6550, one EL34, one 6L6GC, one KT88, and Adaptive AutoBias would recognize the differences, make the appropriate adjustments, and the amp would function perfectly. Now... it may not sound very good, but it's just nice to know you could. EL34 Tube PrimaLuna Silver Label G2 Black Bottom Power Tube Power pentode vacuum tube for audio amplification Characteristics: Higher distortion (i.e. warmth) at lower power levels Expected lifetime under normal usage: 2000-3000 hours KT88 Tube PrimaLuna Silver Label Power Tube Beam tetrode/kinkless tetrode (KT) vacuum tube for audio amplification Characteristics: High power with low distortion Expected lifetime under normal usage: 2000-3000 hours KT150 Tube PrimaLuna Silver Label Power Tube Beam tetrode vacuum tube for audio amplification Characteristics: High power with low distortion Note: KT150 tubes can only be used with Prologue Premium, Dialogue Premium and Dialogue Premium HP 12AU7 Tube PrimaLuna Silver Label G2 Driver Tube Medium-gain dual triode vacuum tube Application: pre amp stage Expected lifetime under normal usage: 5,000-10,000 hours 12AX7 Tube PrimaLuna Silver Label G2 Driver Tube Dual triode vacuum tube with high voltage gain Application: pre amp stage Expected lifetime under normal usage: 5,000-10,000 hours 5AR4 Tube PrimaLuna Silver Label G2 Rectifier Tube Full wave rectifier vacuum tube Expected lifetime under normal usage: 5,000-10,000 hours
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