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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: RE: Transformer type - now general PSU question . posted by WALLACE on August 4, 2008 at 10:08:43:
I have found that large amounts of capacitance in the circlotron output supply are very beneficial to bass response. For example, in my 6C33C-based amplifiers I am using 14,000uF per phase. But use a bunch of small high-quality electrolytics in parallel, rather than one blockbuster size cap. Then you can use some low value resistors in between the individual caps, for added filtering and to make life easier for the power transformer that has to fill up those caps. In my amps, I have CRCRCCCCC networks, were R = <1 ohm, and each C = 2000uF. Any inductor that could handle the current involved in feeding the output stage would have to be humongous in size and should also be very low in DCR, which will make it an even bigger part. If you've got a huge chassis to fill up, and if you can even find any inductors that are qualified for the job, go for it.
Incidentally, I too use AC filaments and have zero problem with hum. If there is any at all, it's totally inaudible.
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- RE: Transformer type - now general PSU question . - Lew 12:28:45 08/06/08 (0)
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