6550 is a beam output pentode with an octal base and power of 35W. Very powerful and great for bass, guitar and Hi-Fi amplifiers. It delivers a little less power than the KT88 but with a fatter tone.
All RUBY™ Tube power tubes come already matched. There is no extra charge for this service. Our Magic Parts matching process is very exact and our tubes are matched within +/- 1 mA (mille amp) of each other.
We can supply tubes in matched pairs (MP), matched quartets (MQ), matched sextets (MS) or other groups as requested.
If you order two tubes, we will ship them as a MP. If you order four tubes, we will ship them as a MQ, and so on.
If you have any special requests, for example if you want 12 tubes and they should all be MP and no MQ, please enter that in the Special Request box on the checkout page.