6550 / KT88 Beam Pwr Tetrode

6550 / KT88 Beam Pwr Tetrode

The 6550 is an 8-pin "octal" beam power tetrode tube found in the power amp section of mainly tube bass guitar amps, mostly in sets of two or four matched valves.  It has a 6.3v heater filament and can dissipate 42W. The KT88 is a similar substitute beam power tetrode tube. They can be substituted with appropriate bias adjustment. 6550 / KT88 tubes typically handle higher plate voltages than other tubes, and as such offer higher headroom with lower distortion, making them popular in tube bass guitar and hi fi amplifiers. 

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