The GH50R is an EL34-loaded, twin channel, 50-watt ALL TUBE head capable of balancing the amount of pre-amp and power-amp distortion in your tone.
GHR is the product of Laney’s long-term study of how guitar players interact with tube amps. “Tube tone” is composed with what we have come to describe as “RED” and “BLACK” tone elements: RED is tube preamp distortion, in which ECC83 tubes add drive.
BLACK is output tube distortion which increases as the power tubes are driven harder. GHR allows the player to balance RED and BLACK elements to seek the sweet spot in each player’s setup.