Power Pentode
These are rated at Number 5.
The Groove Tube 6550-C Vacuum Tube is a softer version of
the older USA 6550A, with a nice distortion character.
This tube has a distortion that is between a 6L6GC and a
6550A.
In older Marshall's that have 6550's, this tube will
give you more compression and distortion at lower levels
than the other 6550 offerings.
This tube is terrific in Class A amps such as the GT
Solo Single when you want to have a lot of output for
smaller live venues.
Many people prefer these in some Marshall amps where
more clean headroom and output is desired.
The Groove Tube 6550 Vacuum Tube is a Glass octal type used
in the output stages of high-fidelity audio amplifiers.
It requires an octal socket.
Electrical Data:
Heater Voltage ................................ 6.3 V
Heater Current ................................ 1.6 A
The picture shown is simply for reference.