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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: 2 questions posted by Russ57 on October 20, 2006 at 18:06:22:
"what device/circuit would allow a constant voltage operation of a pentode"A simple power supply connected directly to the plate?
I suppose you could couple it to a speaker by inserting the primary of a transformer in between the ps and plate. Of course that would rotate the 0 ohm load line depending on the impedance ratio of the transformer and the impedance of the speaker. ;)
Maybe that's why people that talk about parafeed call this 'series feed.' Parallel feed uses a constant current source (or choke) with ideally infinite impedance and then puts the load that the tube sees in parallel. Series feed uses a power supply with ideally zero ohms impedance and then places the load tube sees in series.
Note that true constant-current and constant-voltage loads (without the additional parallel or series element) are not capable of delivering any power. i*v, v2/R, and i2*R must all give the same result all of the time. No getting around that.
As for driving a speaker with a zero ohm (voltage) or infinite ohm (current) source, that's a different topic. :)
-- Dave
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Follow Ups
- Re: 2 questions - Dave Cigna 14:28:48 10/21/06 (0)
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