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vinu18j
PostPosted: Thu Sep 19, 2013 3:54 pm 
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Dear Coco, I would like know how we can know the amp's efficiency of an 18 watt . On what factors are depend on it, and any method how to calculate the efficiency value.
Thanks
Vinu
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Stoo
PostPosted: Fri Sep 20, 2013 4:54 pm 
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vinu18j wrote:
Dear Coco, I would like know how we can know the amp's efficiency of an 18 watt . On what factors are depend on it, and any method how to calculate the efficiency value.
Thanks
Vinu

I think you'll find that 90% of the people who use guitar amps are more interested in their sound than their efficiency.. These are also tube amps so a lot of energy is burned as heat.


Last edited by Stoo on Mon Sep 23, 2013 1:53 pm, edited 1 time in total.

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kurtlives
PostPosted: Fri Sep 20, 2013 6:09 pm 
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120v in x 2A (max) = 240W input power.

18W ouput

out/in x 100 = efficiency

Of course the amp normally doesn't draw 2A input. Usually around 1A

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Last edited by kurtlives on Sat Sep 21, 2013 11:41 pm, edited 1 time in total.

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vinu18j
PostPosted: Sat Sep 21, 2013 5:22 pm 
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Hi, Thank you for your inputs. Dear Kurtlives, is the formula look like this; Efficiency = P out/ P in * 100. Do we need to take the entire supply voltage into account or not, since half of it is used at any point of time. Any advice. Thanks Vinu.
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kurtlives
PostPosted: Sat Sep 21, 2013 11:45 pm 
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vinu18j wrote:
Hi, Thank you for your inputs. Dear Kurtlives, is the formula look like this; Efficiency = P out/ P in * 100. Do we need to take the entire supply voltage into account or not, since half of it is used at any point of time. Any advice. Thanks Vinu.

Yes you do, you need to take into account the 120V AC in.

The 120V AC is being used at all times. The alternating current is what is causing the transformers to work by created a constant changing magnetic field inside them.

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