nikongod
DIY-ku
- Joined
- Jan 24, 2005
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Quote:
it would be exceptionally nice if any of these guys posted a linearity graph that applied to the audio band.
there are almost certainly some "diamonds in the rough" out there, but with the trends to *only* publish specs at 10khz and higher, how are we to even from an educated guess (aside from trusting our ears, which gets expensive...)
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yes, R20 should (if you want to...) be replaced with a CCS.
Quote:
yes, C8&R17 form a high pass filter.
C10, and whatever you are driving also from a high pass filter.
To kind of agree with davitisk's points before on high-pass filters cut-off-points even though i think the whole thing is still a little overblown, I have seen a couple recommendations to only have 1 filter ANYWHERE near 20hz in the system, as multiple "crossovers" in the same area can cause a smear. cathode bypass caps can have an effect, interstage coupling caps, etc. The idea dosnt seem so far-fetched to me, and in this case is not really all that difficult to execute.
Originally Posted by ericj /img/forum/go_quote.gif As DIYers we look down on some brands of capacitors, and i'm stating to think that it's because the labels look dull. |
it would be exceptionally nice if any of these guys posted a linearity graph that applied to the audio band.
there are almost certainly some "diamonds in the rough" out there, but with the trends to *only* publish specs at 10khz and higher, how are we to even from an educated guess (aside from trusting our ears, which gets expensive...)
Quote:
Originally Posted by Pars /img/forum/go_quote.gif That would be replacing R20 (the 2 Mills resistors in bottom photo are R20 and other ch. R20)? Sorry, toob noob somewhat (can't even reference plate to the schematic part, etc. other than heaters |
yes, R20 should (if you want to...) be replaced with a CCS.
Quote:
Also, am I viewing this right as a high pass filter? For example, C8/R17 forms a filter with a -3dB point of 1/2 * Pi * 100000 * 0.000008 = .19Hz versus if I went 1uf it would be 1.59Hz? |
yes, C8&R17 form a high pass filter.
C10, and whatever you are driving also from a high pass filter.
To kind of agree with davitisk's points before on high-pass filters cut-off-points even though i think the whole thing is still a little overblown, I have seen a couple recommendations to only have 1 filter ANYWHERE near 20hz in the system, as multiple "crossovers" in the same area can cause a smear. cathode bypass caps can have an effect, interstage coupling caps, etc. The idea dosnt seem so far-fetched to me, and in this case is not really all that difficult to execute.