So this is not a big deal and I'm not going to sweat it. But I dragged an amp and guitar cable out last night and wanted to satisfy for myself that my coupling caps were going to be oriented in a way that minimizes excess noise in a couple of amps I'm working on. I tested three brands of caps, all were .022uf and two of the three had markings indicating the outer foil direction. The Mallory's did not. I followed this method and my results were consistent with what he was talking about. The only difference was that I didn't use a bare input jack, I just unscrewed the casing of one of my 6-foot short guitar cables and plugged directly to the solder joints. However, I couldn't detect a sound difference with the Mallory's. I thought I had read somewhere that some of these film capacitor actually has a foil shell wrapped around them that is disconnected from the inner layers, but I've never had the luxury of owning enough Mallory caps to actually cut one open. Again, I'm not going to worry about it. Without any information I am going to orient the caps with the assumption that the outer foil is to the right as you read the lettering on the cap. If their advertising propaganda is to be believed than they are non polarized and so orientation shouldn't be an issue, right? I was really just curious. Is there another DIY method of testing this short of buying an oscilloscope or building another component that, lets be honest, I'm not going to build.