15uF cap for Phase 90

[bancika]

Anyone know what does this cap do and will it change anything if I use 22uF for it. I can't find 15uF in local store...
Thanks

[Papa_lazerous]

it is part of the R/C combination to set the LFO speed, I mesed with values put a 10uF and a 4.7uF in parallel

[R.G.]

Bearing in mind that many electros have a +/- 20% tolerance, and some have a +80, -20% tolerance.

[Papa_lazerous]

noted R.G I'd rather put in 15uF and have +/-20% than put a value of 22uF which is 46% more than stock then if you add the +/- 20% to the equation you end up with a phaser sounding quite unlike the original.... that flavour might suit some peoples taste not mine £0.02 worth not being picky

[mac]

IIRC old P90 had tantalum caps at the LFO and across the zener. I put those in my clone.

mac

[mdh]

I like it with 22uF.  In mine, this makes the fastest speed kind of a Leslie-like warble (or at least as close as you'll get without really messing with the LFO).  Anything faster would be useless to me.

[mac]

With a 22uf tant and a 2k2 at the LFO you get from very fast to very slow sweep.

mac

[bancika]

I got some miniature 10uF and 4.7uF electrolytics to parallel them for ~15uF. What's the difference in this particular case between tantals and electros? Should I get tantals?
Thanks!

[Papa_lazerous]

in that place I cant see how it will change your tone at all asits not in the signal path at all its just an LFO maybe it will behave slightly differently in how it charges and discharges I dont know, but I cant see someone being able to do an A B test on a tant vs electro

[bancika]

good to hear, thank john!

[mac]

I guess MXR put those tants just because electros age and have wide tolerance, not for tonal reasons.
I'm using tants to replace high uf low voltage electros, filter caps, big bypass caps, etc.

mac

[Papa_lazerous]

Thats quite a good point mac! it should hold its value longer as a tant, and they are smaller....But the price is higher.  I guess if it looses its mojo in 10 years Bane could always solder in another electro