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You might want to look again

If you say the B+ is 220v and using a 10K plate load resistor, dropping Va to 180, your current is (220-180)/10000 = 0.004 or 4mA

0.004 * 180 = 0.72 watts which is pushing it with a 6SL7

But the bigger problem is that a 10K load on a 6SL7 is really inefficient. The 6SL7 is a low current voltage driver, and the 10K really handicaps the swing it can develop. The resistors look like the designer of your circuit was using a 6SN7 and you dropped a 6SL7 into it.

TKs suggestions will make your amp sound a lot better.

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