Question about size of 2 capacitors in my PM2000 console

[JW]

Schematic attached.

This is the program (buss) channel.

See the 3.3uF bipolar after IC 1? Is it okay to use 10uF here, at 3 times the size?

Similarly, for the 47uF after IC 2, is it okay to replace with 100uF?

I'm really liking these Elna bipolars, but different values are scarce.

???

 

[iampoor1]

Yes, should be fine and provide some ultra low end extension.

 

[Matt C]

Yes, I've replaced those parts in my PM2000 with larger value capacitors and it's fine, like iampoor says it extends the low frequency response down even further

 

[JohnRoberts]

Schematic attached.

This is the program (buss) channel.

See the 3.3uF bipolar after IC 1? Is it okay to use 10uF here, at 3 times the size?

Similarly, for the 47uF after IC 2, is it okay to replace with 100uF?

I'm really liking these Elna bipolars, but different values are scarce.

???

Yes OK, and bus is spelled with only one 's'.

JR

 

[JW]

Thanks guys,

Just an additional question here. I know that say, in the 2520 based pultec amp, the cap in that position (on the output of the opamp) is for DC blocking. Is that the case for the caps above as well?

If so, is it different levels of DC that need to be blocked and Yamaha, having thousands upon thousands of every cap available, used only the amount of capacitance needed for those particular points in the circuit?  Looking at the input strip in this same console, I see a different value as well on the output of IC 1 for example. 33uF

Sorry about mis spelling bus. 10 pushups.

 

[JohnRoberts]

Thanks guys,

Just an additional question here. I know that say, in the 2520 based pultec amp, the cap in that position (on the output of the opamp) is for DC blocking. Is that the case for the caps above as well?

If so, is it different levels of DC that need to be blocked and Yamaha, having thousands upon thousands of every cap available, used only the amount of capacitance needed for those particular points in the circuit?  Looking at the input strip in this same console, I see a different value as well on the output of IC 1 for example. 33uF

Sorry about mis spelling bus. 10 pushups.

You want to block even small amounts of DC to prevent scratchy pots and switch clicks.

In general electrolytic caps are not highly regarded for sonic quality, but by setting the actual HPF pole way below the audio bandpass insures that the non-ideal cap characteristics are not exercised.  As long as there is little or no changing AC voltage across the caps, they will be relatively transparent.

JR

PS: The number of pushups increase exponentially with future violations of bus spelling.