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18th September 2010, 09:42 AM
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#1 |
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diyAudio Member
Join Date: Jun 2006
Location: Hunter Valley,NSW,Australia
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Easy Way To Reduce 251V to 235V?
Can anyone supply an easy way to reduce 251 volt mains voltage to say 235-240 volts?I'm sick of blowing tubes.
I want to build a jukebox with 3 tube and 1 SS amps,and want to reduce the pressure on the tubes.I just want to reduce the mains voltage for all amps.I've thought of using resistors in parallel to achieve the power handling. What do you think? Custom transformer? thanks Paul |
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18th September 2010, 09:49 AM
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#2 | |
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diyAudio Member
Join Date: Mar 2007
Location: Auckland, NZ
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Quote:
__________________
"Folks, you can't prove truthiness with information. You prove truthiness with more truthiness. In a process known as truthinessiness." - Stephen Colbert, The Colbert Report |
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18th September 2010, 10:05 AM
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#3 |
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diyAudio Member
Join Date: Jun 2006
Location: Hunter Valley,NSW,Australia
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My AC mains voltage from the wall outlet is 251V.This I think is too high for tube amps that usually specify 230V AC input.
I know I could alter each amp that I buy, but I'm looking for a way to reduce the GPO voltage by a small amount without paying heaps. I hope this makes sense. thanks Paul PS Solid state amps don't seem to mind the extra voltage but I worry about tube amps,especially fixed bias. Last edited by coit; 18th September 2010 at 10:09 AM. |
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18th September 2010, 10:22 AM
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#4 |
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diyAudio Member
Join Date: Sep 2008
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Read this: 240v to 220v
Especially post #7
__________________
Real tubes have top-caps |
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21st September 2010, 06:53 AM
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#5 |
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diyAudio Member
Join Date: Jun 2006
Location: Hunter Valley,NSW,Australia
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Thankyou for the replies.I read the article on bucking transformers on the ESP site and decided to build one.
When I went to the Tortech transformer site to look for an appropriate tranny; lo and behold they have introduced a pair of autotransformers to knock 20V off your power supply.Serendipity. thanks Paul |
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