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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Re: Thinking out loud about HF filament supplies posted by Kurt on March 25, 2003 at 07:55:15:
My recent experiments are in agreement with much of this, particularly the issue of AC sonics and sine distortion at the filament. I am now using an "electronic transformer" operating at 50 kHz to heat a 211. I have inserted a simple series-resonant LC network between the supply and the filament. As it turns out, this appears to provide more peace of mind than genuine sonic benefit. I am unable, in fact, to hear a difference referenced to squarewave heating, althouh both square and sine are demonstrably and consistently superior to DC.I have also had the opportunity recently to substitute a switching supply. This effort was focused on determining whether the AC/DC difference might be related to complex common mode (AC line) issues. The switcher did not provide the air of any AC supply, rather it sounded remarkably similar to a simple series pass DC regulator.
I am hesitant to proclaim that I have reached any universal conclusions. Nevertheless, it is clear relative to at least this particular amplifier that AC lends a remarkable life to music. All DC sources I have installed to date, on the other hand, have rendered the music dull and lifeless by comparison. I should also mention that I have not experienced the sterility of sound with AC that you mentioned, but this could be the result of any number of variables, including the tube type.
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Follow Ups
- Re: Thinking out loud about HF filament supplies - Triode Kingdom 03/25/0308:49:10 03/25/03 (0)
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