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Looking for 5H and 20H chokes
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<blockquote data-quote="Ampdog" data-source="post: 78409" data-attributes="member: 144"><p>No! At least not as is. One does need an air gap (mostly consisting of a piece of fibre/cardboard). A mains transformer can presumably be dis/reassembled for this purpose, but with pre-amps one can often get by with an RC filter (or doubled).</p><p></p><p>Number of turns are not that many. Done carefully on a bobbin with a proper winder or even a low-speed drill, some <10 minutes random wound. But a simple semiconductor regulator (discreet components) will probably be easier and less expensive. As an example, I use 4 x h.v. transistors and a few zener diodes in a 600V - 500V regulator; output impedance <3 ohms. (Put in the negative h.t. line and you can heatsink the collector directly to chassis.) </p></blockquote><p></p>
[QUOTE="Ampdog, post: 78409, member: 144"] No! At least not as is. One does need an air gap (mostly consisting of a piece of fibre/cardboard). A mains transformer can presumably be dis/reassembled for this purpose, but with pre-amps one can often get by with an RC filter (or doubled). Number of turns are not that many. Done carefully on a bobbin with a proper winder or even a low-speed drill, some <10 minutes random wound. But a simple semiconductor regulator (discreet components) will probably be easier and less expensive. As an example, I use 4 x h.v. transistors and a few zener diodes in a 600V - 500V regulator; output impedance <3 ohms. (Put in the negative h.t. line and you can heatsink the collector directly to chassis.) [/QUOTE]
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