Can I replace my power tubes with smaller ones so that my 100 watt amp will run at lower power?
Smaller power tubes such as 6v6’s or 6BQ5’s (EL84) operate under lower voltage and current conditions than do higher power types such as 6l6gc 0r El34’s. Power supply voltages must be brought down to safe levels before attempting this change. Using a high-sag tube rectifier such as a 5U4gb can help to bring the voltage down as well. Using two 5U4gb’s in series will give you a “Dual Rectifier” with lower voltage still.