cube-tube
Super Member
Yes, the polar cap thing is regarded as relevant to the C9 and is standard practice when restoring one of these. Sellers on that auction site have been moving those kits for years, so best I can say, check the rating and go from there. It does save some digging around to get what you need.
Now, if you REALLY really want to upgrade your C9 ... get an H9AV ... <G>
Seriously, I did that a bit back and the C9 is now collecting dust. I also upgraded some of the original op amps in the H9AV with OPA627 browndogs and replaced the others with "silver back" and "red stripe" TI versions that are much better than the original Malaysian chips, as well as adding some bypassing that had been overlooked in the original design. Upgrading the transformer on both these and the C9 are also considered a big plus, but I haven't done that as I have no hum or noise at this point.
Would the C9 sound as good (or better) than the H9AV if I did the same mods? Dunno ... ran out of chips. <G>
BTW ... you DO know the original post here was six years ago? <G>
Just looked up the H9AV on Google. Looks like it has a little adjustability that the C9 lacks. Also looks like it has two different mono outputs for a center channel, obviously. I also did a search for the H9AV on "that auction site", and it pulled up nothing but a bunch of Casio watches, some kind of pump, and a single car wheel.
As a side note, I'd be happy to dust off that C9...