Help with Output Cap Discrepancy

[Ampersands]

Hello All,

I'm in the process of Modding a Music hall cd25.2 and I've come across a little problem with the output film caps. The value on the caps read 1uF, but the board position is marked '104' which i believe translates to 0.1uF. I'm looking to replace these with some nice RelCap's or Dynamicaps and it would be cost effective if I could use the 0.1uF value.

Anyone know why there is this discrepancy? Should I just suck it up and stick with the 1uF?


Also, the unit uses Nichicon's Fine Gold capacitors. I was thinking of swapping these for Nichicon KZ or Blackgate Standards. Are the fine golds good enough? Would this just be wasted effort?

Thanks for the help!

[dsavitsk]

Originally posted by Ampersands
Anyone know why there is this discrepancy? Should I just suck it up and stick with the 1uF?

Info on choosing output caps in the first couple of paragraphs at http://www.ecp.cc/cap-notes.html

Originally posted by Ampersands
Would this just be wasted effort?

Probably.

[Ampersands]

I've actually seen your capacitor shoot out here and on head-fi. You certainly give great information. One question though, for input impedance, is that 'looking in' from the cd output jacks, or 'looking in' from the amplifier its attached to?

[dsavitsk]

Originally posted by Ampersands
One question though, for input impedance, is that 'looking in' from the cd output jacks, or 'looking in' from the amplifier its attached to?

I'm not sure i follow you. The input impedance is what the cd player sees. So, if you plug your cd player into a preamp with a 50K potentiometer, the input Z is ~50K. There is more to do to get it exactly right such as considering the output Z of the cd player to be in series, and the input Z of the preamp circuit in parallel, but these will change the value only slightly (probably less than the tolerance of the cap), so they can be safely ignored.

[KP11520]

Hi,

Doug has done us a fine service and Tony Gee has too, so read them both, but also look at the thread by DaveT on "Tripath Input Coupling Caps."

Coupling caps, either input or output, kinda do the same thing so Dave's thread has some value too. Between all three, if you read all of it, you will have some great ideas on how to start, test and achieve the results you desire. You will also gain some additional knowledge that will come in handy somewhere in this hobby! Oh, and you just might find some real values in these threads that will save you some cash!

ALWAYS REMEMBER, YMMV! So you have to test your choices in your circuits. These are just guidelines that may help you shape your test choices!

Good luck!

Regards//Keith

[Ampersands]

Thanks guys. I may have been unclear in my earlier post, but you answered my question. Thanks.