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my tact class d amp (SDA 2175) uses tiny lytic 4,7 uF at it's balanced input. Using this amp for bass duties up to 200hz only but feel that such tiny lytic caps leave probably a lot to be desired.
Problem is I have hardly any space cause input board of the amp mainly using smd parts and the caps are around 1/10" in diamenter and not much taller so something like mundorf, V-cap etc isn't workable. Guess I have to got for better lytics. Are black gates good for such applications? Any other recommendation?
regards
Duomike
Follow Ups:
4.7uF seems kind of big for a coupling cap. Are you sure it's not 0.47uF?
If it is you might have room for a non-electrolytic cap. A nonpolar film or PIO cap will sound better than a lytic. Whenever I try a different cap out I don't mind trying a smaller capacitance value, I just make sure that the voltage rating is the same or larger.
Also, if you know for sure that your preamp has a coupling cap on the output, then maybe you could just bypass the input cap entirely. Of course, you should put the cap back if you ever sell the amp or use it elsewhere.
Thanks for your comments. It clearly says 4,7 uF. Not sure why they use such a big value.
I measured only 2-6 mV Dc at the output of my preamp and I though what the heck just bypass these caps.Strange effect was that bass seemed a little quiter but everything was more clear like some distortions have been removed.
Duomike
The reason that it uses a 4.7uF is because IIRC, the amplifier has a 10K ohm input impedance. A 0.47 would put the corner frequency within the audible band.
If this is a through-hole device and is simply in series with the input, you can locate them between the input jack and the board, and just jumper on the board.
-Paul
Get in touch with Kyle at RAM for Rubycon ZA series.Fantastic sound.
Mike
When I needed to replace aged electro-chemical constucted coupling-duty capacitors in a circut with limited PCB space, I used bi-polar (or non-polarized) electrolytics as a sonic improvement. Supposedly polarized caps distort half the time from odd-order harmonics due to passing signal via a charge-discharge cycle. But bi-polar electrolytics distort all the time, only now with even-order harmonics which are easier on the ears & harder to detect. Modern fabrication technology permits bi-polar construction in the same physical size package previously occupied by polar construction. In the USA, my local Radio Shack had Nichicon brand in the 4.7uf & 10uf values I needed.
Thanks a lot for the recommendation Ron!
Duomike
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