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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Article about Black Gate caps in 'Hi-Fi News' magazine posted by jeffreybehr on February 24, 2005 at 14:11:56:
Thank you profoundly for the link to Martin Collums' article on Black Gate caps which appeared in Hi-Fi News. I have long been a fan of B-G's but learned quite a bit from his article. It seems that there is a great deal of mis-understanding why 'lytics, especially, as well as larger film caps (> than a few uF) should be bypassed. EVERY capacitor has a resonant frequency, at which it electrically drops out of circuit. The purpose of the bypass cap is to shunt the RF's that are generated in ALL circuits to ground so the bypassed cap will NOT reach it's resonant frequency. (the bypass cap forms a time constant with the resistance in the circuit that determines at what point the bypass starts to shunt frequencies to ground). In order to achieve this the bypass cap, in my experience, should be no larger than 0.01 uF. Larger bypasses will intrude into the audio frequencies and adversely effect sonics. In this instance, more is NOT better, but WORSE. In addition the bypass MUST be non-inductive or it too will go into resonance at some freqency. Again, my experience tells me that there is a hierarchy in bypass caps. In ascending order of quality they are ceramic, stacked film, and silver mica. Silver mica's have been the favorites of Hams for over half a century because they are the fastest and best performing at radio frequencies. silver micas are readily and economically available on the surplus market.Happy Listening !
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Follow Ups
- Re: Article about Black Gate caps in 'Hi-Fi News' magazine - pkell44 17:52:43 02/26/05 (2)
- Re: Article about Black Gate caps in 'Hi-Fi News' magazine - Wally 01:17:29 02/27/05 (1)
- Re: Article about Black Gate caps in 'Hi-Fi News' magazine - lovekylie 11:45:12 02/27/05 (0)
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