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In the Forum: Audio Discussions
In the Thread: How to get a LOT of SET power.
Post Subject: This amp is OK only if you know the resulting Sound.Posted by Romy the Cat on: 5/22/2011
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N-set, it is nice to see that you are keep punching the idea, somebody shall, I guess..
About the filters. For the low-pass and in this application I do not use inductors and much prefer RC filter. In LC filters the band-pass flows over coil. If we are taking about 20Hz filter then we have a coil of 50H-60H – it will be 5 kilometers of wire. If you use some kind of fancy cables of $1000 per meter and feel that this meter is important then in the coil you will have 5000 times of uncontrollably-sounding wire. In RC filter the signal the flow over the cap is the signal that shunting to ground and the band-pass signal flow only across the resistor, therefore it does not see any ugly reactive loads.
About the rest of the amp. I am not wild about it as it has a fixed design. Everything in this amp is moderated by one parameter: the current of the driver tube. What would happen if you do not nned 160W but would like to stray with 80W. Even if you redo your huge and expensive 100H plate choke then you will be force to lose power on the driver tube. You do not want to weaken the driver but only weaken the output tube.
I am not getting the idea about driving the filament from OPT transformer, can you to elaborate on it purpose and method?
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