Taking a 5y3 rectified dual 6v6, 3x 12ax7 guitar amp running a 10k load into an 8 ohm or so speaker, the power amp at 70% idle dissipation for class AB, the total gross power consumption ought to be:
heater consumption:
5y3: 10w (5V, 2A)
6v6: 5.67w (6.3V, .45A)*2
12ax7: 5.67w (6.3V, .3A)*3
Idle Signal Draw @ 70% 6V6 dissipation:
6v6: 16.8w (.056mA / 300V * .7)
12ax7: approx 6 or 7 mA
total: 38.147w
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