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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: starved filaments posted by deathtube 667 on April 10, 2014 at 19:32:17:
The original DHT's were all designed to be lit with DC filaments at that time, batteries. AC operated tubes were an "economical" solution, and also more practical. Previous designs used higher voltage that certainly would be too high with AC (5-10V) 2.5VAC was "low enough" to "get away with".When you can measure with no "music signal" ANY AC signal at the output, like ANY AC operated 2A3, then your amplifier is not just a music reproduction machine, it's a buzz bomb helper. Argue all you want. This is/was not the intention of AC filament design. It is a biproduct of an economical compromise, period. The modulation which has to, and will occur
with the music, is, because of the relative "lowness"of the frequencies,
the "warmness" it is attributed to. How this isn't obvious, I don't know.So, clearly if you decided to try my request in a way as free as possible from interfering variables, then DC would be required, which may be a PITA understandably.
Edits: 04/10/14
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Follow Ups
- RE: starved filaments - GSH 20:37:23 04/10/14 (1)
- RE: starved filaments - deathtube 667 03:44:55 04/11/14 (0)
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