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But the delivered current is doubled with four tubes. Power (Watts) = Current (Amperes) x Voltage (Volts).
This mod is a must-know survival trick for all Twin owners. If you want cleaner and spankier preamp distortion charcteristics, you may replace the V1 or V2 12AX7 preamp tube with 12AT7 and 12AY7.
If you are one of these players, you should find some mods on this page interesting.
With just a few simple tricks you can make your Twin break up earlier like the more versatile Pro Reverb 2×12″ and Deluxe Reverb 1×12″.
The voltage levels on the plus- and minus-sides of the output transformer’s primary circuit remains the same whith two and four 6L6 tubes.If you pull one tube the other channel’s tube will be hotter biased and offers more gain.The amp will play louder than before given the same volume knob setting.Half power mod – Pull out two 6L6 and disconnect 1 speaker.Pull out the two inner 6L6 tubes and you have a ~40-50W amp.Sadly, we are seldom offered the opportunity to turn the volume above 3 on a Twin Reverb.Instead we have played many nights with a thin and unpleasant tone, even worse with a sparkling, clean sounding strat.You should/can also disconnect one of the speakers to not have an impedance mismatch.The Twin reverb output transformer is designed to work most efficiently with the following impedances/loads and tube power configurations: The plate voltage will increase a little when two of the tubes are removed.The stronger signal will push the second gain stage (V4 tube) harder and give you increased sustain, compression and harmomics.This mod does not change the amp’s clean headroom but increases the preamp gain and preamp distortion.