Hi all,
Could someone check this out for me - I think I must be wrong.
I have an amp that uses 4 6L6, 2 6FQ7 and 1 12AT7. All valves are 6.3V and the total current draw for them all is 3.6+1.2+0.6= 5.4A at 6.3V.
Now I want to roughly figure out what current this amp will draw from the mains supply. A quick calculation on ohms law says that that equals 34W. Now I know the B+ and various other bits and pieces will add a bit more, but the plate on the back of this amp says 250W. Fuse fitted is 4A.
Whats the correct way of getting a reasonably close estimate on this?
Fran
Could someone check this out for me - I think I must be wrong.
I have an amp that uses 4 6L6, 2 6FQ7 and 1 12AT7. All valves are 6.3V and the total current draw for them all is 3.6+1.2+0.6= 5.4A at 6.3V.
Now I want to roughly figure out what current this amp will draw from the mains supply. A quick calculation on ohms law says that that equals 34W. Now I know the B+ and various other bits and pieces will add a bit more, but the plate on the back of this amp says 250W. Fuse fitted is 4A.
Whats the correct way of getting a reasonably close estimate on this?
Fran
That 'bit more' you're talking about is the greater part of it! The heaters take only a small proportion of the total consumption, like about 20%.Now I know the B+ and various other bits and pieces will add a bit more, but the plate on the back of this amp says 250W.
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