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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: keep going...sooner or later, you'll get it. posted by mqracing on November 30, 2004 at 20:38:53:
We went trough some literature citates before, and I gave some references, too. I didn`t mention, for example "Valve amplifiers 3", pages 461-463.
Why is confusion? Composite load-lines are somewhat complicated, and second - difference between loading of the both half of the primary vs. loading only one half of the primary.
Your example with CT secondary (or two secondary windings) is the best for understanding this - I`ll repeat this:
- let`s say we have 300 turns primary and two secondary of 10 turns. Turns ratio between primary and one or another sec. is 30:1.
- when we connect one 4-Ohms speaker on one or another secondary (only one, other stays "open"), our tube at the primary "see"
(30^2)*4=3600 Ohms reflected load. Let`s say that it "produce" 100Vrms at the primary, and now our speaker "see" 3,33Vrms, and dissipate (3,33^2)/4 = 2,78W.
- we can connect our secondaries in series, and connect 16 Ohms speaker. Turns ratio is now 300/20=15, but reflected impedance is the same like in the first example (15^2)*16=3600 Ohms. Power is the same - 100/15=6,67Vrms, P=6,67^2/16=2,78W.
- but, we can connect TWO speakers of 8 Ohms, one across each secondary, every speaker now gets P/2=2,78/2=1,39W, AND our reflected primary resistance is the same, or 3600 Ohms. Every speaker "see" 3,33Vrms, and P1=P2=P/2=(3,33^2)/8=1,39W.
- in another words - full CT secondary is 16 Ohms, half is 4 Ohms or 1/4 and two halves 2 x 8 Ohms, or if the both halves are loaded, each "see" 1/2.
- this is it, very simple. No one proved that this is wrong. I get just lot of trolling and blablah.
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Follow Ups
- Re: keep going...sooner or later, you'll get it. - Damir_the real one 11/30/0423:08:35 11/30/04 (1)
- Now this I like a lot.....great explanation...thanks(nt) - Russ57 07:22:38 12/1/04 (0)
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