The Tremolo circuit was modified from the opto-coupled or photo-cell tremolo circuit in the blackface amps and moved to a bias modulated circuit. This change provides a more pleasing and warmer sound to the ear.
The Normal and Vibrato channels of the Deltone has volume, treble, bass, reverb, speed, and intensity. The Vibrato channel has an additional middle control. The original blackface deluxe amp did not have a middle control. The middle control is a great addition as it provides more control for the player’s midrange sound.
The Deltone comes standard with a 6V6 tube configuration. The amp can accommodate a 6L6 configuration with 35 Watts of output power. An additional feature with the 6L6 configuration is a 4k/8k option. This allows the player to simply switch the load to provide a cleaner or more distorted sound. The 4k option provides cleaner tones, while the 8k option will lower the wattage and provide quicker mid-range break up.