TS808 Bass Control cap replace

[roccster]

Need help with replacing the following caps:

39nf - (i have 33nf)
20nf - (i have 22nf)
51p - (i have 47p)

Getting hold of these caps in Sweden seeems a bit tricky, so will my replacements work, or do I need to start e-bay hunting :)

[rocket88]

should be fine. i don't think being off that little will make a noticeable difference. if you're super concerned that it won't be right then go onto the bay to get the exact ones.

[roccster]

Sweet, thanx for the reply. I give it a go with these caps and see what happens :)

[rocket88]

remember, what do you have to lose? worst case scenario, you decide you don't like it and get the other ones. caps are cheap.

[dbat69]

You could socket them until you get the correct value, or you could try different ones to see what difference it makes

[Beaker]

As the guys say, the ones you have should be close enough to make no audible difference.

However, f you have room to fit two caps side by side, don't forget that you can use two (or more) caps in parallel.

For example:

To get 51pF, use 33pF and 18pF = 51pF.
To get 39nF, use 5.6nF and 33F =38.6nF
To get 20nF, use two 10nF caps = 20nF

[Frank_NH]

One more point.  All caps have a tolerance like resistors - usually 5% (denoted by a J) or 10% (denoted by a K).  So, for example, a capacitor labeled 103J is 1 nF, 5% tolerance, which means it can actually be 950 pF or 1.05 nF.  For 103K, the range would be 900 nF to 1.1 nF.  I suppose you can measure with your DMM.  For filter applications, this probably doesn't matter too much unless you have ultra sensitive ears.

As for measurement of capacitors, make sure you're not touching the leads (use alligator clips).  Also, I've noticed that trying to measure anything below 100 pF seems to give values that are off by more than 10%.  Either the DMM can't measure that finely or the small pF size caps can really be out of tolerance!