Telefunken KT88-TK Black Diamond Series Vacuum Tubes (Matched Set of Four)

This matched set of four Telefunken KT88-TK Black Diamond Series Vacuum Tubes is ideal for use in guitar amplifiers and hi-fi power amps in homes, studios, and live stage applications. For personal enjoyment or commercial recording, they grant the signature KT88 midrange with the added benefit of expanded low and high frequencies. Among the largest in their class, these beam-power tetrode tubes deliver high power and low distortion while handling plate voltages up to 800V. Depending on the circuit type, they can be used as beam-power tetrodes or output-beam pentodes.

Newly manufactured and cryogenically treated version of the legendary KT88

Beam-power tetrode tube design similar to the 6L6 and EL34

Great for guitar amps and hi-fi power amplifiers

One of the largest tubes in its class

Handles plate voltages up to 800V

High power and low distortion make it ideal for scenarios where higher gain with less distortion than a 6550 is desired

Yields the characteristic midrange of the original KT88 manufactured by MOV (Marconi-Osram Valve) plus expanded low and high frequencies

Each tube is meticulously measured for all critical parameters of performance including transconductance, gain, noise, and microphonics

Tubes are selected by hand, rigorously tested, subjected to an extended burn-in period for stability, and remeasured before final packing