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FAQ answers 

Q6.    What is the advantages and disadvantages between using AC filament and DC filament ?

Ans :   

AC filament give out a little bit higher hum noise level, but is so insignificant that didn't border the actual performance, it will just affect the measurement specification. In return, it gives out much better sounding than DC filament method. AC filament will be more musical, more sweet and more warmth. Usually those  brand name products will not use this approach, because it take a very high technique and a lot of experience  to built an AC filament pre-amplifier or power amplifier, it is not suitable for their cheap way of production. Almost all our power amps are build with AC filament design.

DC filament with solid-state regulator can give you a very good measurement performance, especially in noise level, but the sound quality will be dramatically lowered. The sound will be more dry, lifeless and harsh in nature. Usually those brand name products will use  this method in their products, so that the specification will look a little bit better, more easy for production and looks like a little bit more components on circuit board , so that they can open their big mouth shamelessly to ask for a unreasonable amount of  money, but it just sacrifice the most important part of an audio system....sound quality !!!

DC filament with no solid-state regulator is the better sounding and lower noise design , which we mostly used in our pre-amp design for those customer who need extreme low noise to drive their high power/high gain amplifiers or speakers. Of course this practice is not as good sound as AC filament, but AC filament is just too noisy in many systems, so this option is mostly suitable for system or someone who like totally noise free listening. 

For Phono stage, we had to use DC filament design,  otherwise the hum noise will cover up everywhere of the room 

information posted by www.space-tech-lab.com

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