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Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
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Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
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In Reply to: Question Re: C and R value/ratio on line level crossover filters posted by Ian L on November 28, 2005 at 18:02:10:
Yes, of course. You just have to know what to optimize. Easier said than done, of course - that's where engineering comes in! :^)If the minimum impedance (usually the resistor value is a good estimate) is too low, whatever is upstream will have a hard time driving it. If the impedance is too high, stray capacitances will modify the tuning in unplanned ways, and RFI pickup is enhanced. So, all you have to do is find out the perceived distortion of the upstream component as a function of loading, the RFI susceptibility of the circuit, and the stray capacitances, then weight those variables "appropriately" and you can calculate the optimum.
I like to stay around 100k with most tubes, but if you are using high-impedance tubes like the 12AX7 you may want to go higher - 200 or 300k. Don't forget to worry about multiple filters in parallel, which will reduce the impedance sen by the upstream stage!
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Follow Ups
- Re: Question Re: C and R value/ratio on line level crossover filters - Paul Joppa 18:39:58 11/28/05 (3)
- Re: Question Re: choice of tube for line level crossover filters - Ian L 16:02:23 11/29/05 (2)
- Re: Question Re: choice of tube for line level crossover filters - Paul Joppa 17:07:29 11/29/05 (1)
- Thanks very much Paul - Ian L 23:52:43 12/01/05 (0)
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