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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: Thoughts on doubler supply straight out of wall no transformer 450V caps.??? posted by -3db on September 16, 2002 at 00:55:06:
This is really very dangerous, unless you know EXACTLY what you're doing.
Even if you did (and if you did, you probably wouldn't have asked),the effort in ensuring safety far outweighs the cost / weight advantage.
Domestic equipment manufactures used this technique for many years on radio, audio and TV, for cost and weight reasons. Most of the makers took great effort to make the product safe - no metal was touchable, isolation components on input and output etc. They also developed special valves/tubes with high voltage, controlled current heaters, wired in series, so a heater transformer was not necessary.
Even so, the performance of the radio / audio using this technique was always inferior: Hum and noise being the main problems.I spent a few years as a member of a national test comittee, and can confidently say that none of the equipment that used these techniques would pass the current safety tests.
Whilst I am happy (but cautious) working in my current 1400v HT amp, I wouldn't build a "live chassis" 380v one!
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Follow Ups
- Please don't - dhaen 02:17:13 09/16/02 (0)
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