We refer to the tubes and their positions in the amp as V1, V2, etc. for preamp tubes and P1, P2, etc. for power tubes. The number indicates the position of the tube as counted from right to left when looking at the back of the amplifier. The right to left progression follows the circuit from input to output.
|Function||1/2 Push-pull power stage||1/2 Push-pull power stage||Phase inverter and drive||Reverb return and mix||Reverb send||Initial gain stage, post tone-stack recovery|
The Viceroy is a cathode bias (self bias) amp and as such does not require a bias adjustment when changing tubes. Please use well-matched pairs of power tubes for maximum clean power; however, the unique design of the Viceroy output section allows use of unmatched tube pairs as the amp tends to balance out tube differences. The Viceroy can only use pairs of 6L6, 5881, or 7581A power tubes.
Carr Amplifiers selects and tests the finest current production tubes specifically for each amplifier model. Caution should be used when buying replacement tubes from any dealer who does not have a return policy as all tubes can have problems (NOS tubes are susceptible to microphonics and failure too).