"non-polar" capacitor?

[Jim Brain]

Since I acquired a Coco Orchestra 90 unit awhile back, and I am trying 
to find the source of some humming in my system when the Orch 90 unit is 
operational, I looked at the schematic:


http://www.colorcomputerarchive.com/coco/Documents/Manuals/Hardware/Orchestra-90%20CC%20Stereo%20Music%20Synthesizer%20(Tandy).pdf


(page 109 of the PDF)

I understand the ROM, the resistor ladders, and the latches, but analog 
is not my strong suit.  I made my way through the op-amp design, but I 
am stumped on one component (actually three)?


C7,C9, and C10

They look like electrolytic polarized caps, but are NP (non polarized), 
with no '+' on the schematic.


Can someone shed light on what these are and where you would find them 
(or if they can safely be replaced with another kind of capacitor)?  I 
will admit I've never seen mention of these before now.

Are they "bipolar"?

http://www.digikey.com/product-detail/en/nichicon/UVP1H010MDD/UVP1H010MDD-ND/242804


Or, are they called something else now?

Jim





-- 
Jim Brain
brain at jbrain.com
www.jbrain.com