Bottlehead Forum
Bottlehead Kits => Legacy Kit Products => Quickie => Topic started by: Paul Joppa on August 15, 2012, 11:39:51 AM
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Here's some interesting data I ran across today:
http://www.tnt-audio.com/clinica/regulators_noise4_e.html
It appears that alkaline cells are much quieter than NiCd or lead-acid batteries. Unfortunately no other types (NiMH, Li, etc) were tested. Note that this is page 4 of an article on quiet regulators, the rest is interesting if you are into that stuff.
I wish I could claim to have chosen alkalines for the Quickie on this basis, but this is the first real data I've seen.
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Hey Paul - I had seen that 'observation' before. Interesting topic. I have also seen claims that LiPo4 sounds the best (possible a Jeff Rowland reference). I have played around with different chemistry's a bit. No difference that I can tell. I thought I heard a difference in sound when I was running my t-amp on battery, between a 500mah NMH pack and 3000mah NMH pack, both 30v. It turned out to have more to do with the chemicals in my brain at the time.
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I know of at least one dac manufacturer who has also found huge differences in sonics between li ion packs from different manfacturers -- and at very different price points as well.
This is one reason why I use a Pi Battery buss filter/regulator between my SLA battery and my mac mini (that has been modified for a dc supply.)
I've also heard that there are sonic differences between some of the NiMH batteries -- there are some low self-discharge niMHs that are supposed to be better for audio than the standard types -- and of course they cost about twice as much -- or about $6 for a rectangular 9v cell. Not sure how much difference it would make in the filament circuit though.
Thanks for the link Paul -- nice to have.
-- Jim