Michele, thanks for sharing your tube-rolling experience.
If I understand you question correctly, yes, tube amps must be used with a specific output tube to sound their best, however, the switch that Carry provides probably changes a few electrical parameters to make the amp compatible with 211 AND 845.
If I understand you question correctly, yes, tube amps must be used with a specific output tube to sound their best, however, the switch that Carry provides probably changes a few electrical parameters to make the amp compatible with 211 AND 845.