The JJ Electronic KT88 is a sonically faithful reproduction of the original tubes with a robust construction encased in a thick glass envelope. The JJ KT88 delivers a powerful 42 Watts with plenty of headroom to spare. This tube has a tone that is warm and lively with a detailed and balance response. The JJ KT88 is an excellent choice for Hi-Fi stereo equipment as well as guitar amplifiers. It can be used in place of 6550 tubes.

These tubes are Apex® Matched.

Product Measurements

Item Diameter: 52 mm
Item Height: 125 mm
Body Height: 110 mm
Filament Voltage (Uf): 6.3 V
Filament Current (If): 1.6 A
Plate Voltage (Ua): ≤ 800 V, 250 V typical
Plate Current (Ia): 140 mA
Grid 1 voltage (Ug1): -15 V typical
Grid 2 voltage (Ug2): ≤ 600 V, 250 V typical
Grid 2 current (Ig2): ≤ 7 mA
Transconductance (S): 11.5 mA/V
Internal Resistance (Ri): 12 kΩ
Gain (μ): 8
Plate Dissipation (Wa): ≤ 42 W
Grid 2 dissipation (Wg2): 8 W
Cathode Current (Ik): ≤ 230 mA
Grid capacitance (cg1): 16.5 pF
Plate Capacitance (ca): 10 pF
Grid to Plate Capacitance (ca/g): 2.3 pF