So I took a chance on some very cheap poly caps - they occasionally get mentioned on various forums etc. Anyways, I purchased a buttload of them of different values, and thought I would share my findings with ya'll.
First off, a picture:
They are very attractive red color, with a cute nod towards German capacitors as part of their name. According to the nameplate, they are a poly cap, 400V, 3% tolerance. The leads are 0,8mm (~20awg) and are tinned. My highly scientific test of holding a lead to the magnet on a driver indicates they are not ferrous - they did not stick to the magnet. The skeptic in me wants to proclaim they are aluminum or some other such nonsense - but a scrape test reveals they are actually tinned copper.
The epoxy end caps are a good color match, and of the ten of this value are generally flush more or less. None of them have excessive overhang of the over-wrap, the epoxy is all smooth with no wrinkles or runs.
So far, so good for a $1.60 cap.Good looks, nice on-paper specs, well built. How do they measure? Well, I took capacitance measurements using my internally calibrated DER-EE DE-5000. Here are the results of the ten:
Any way you slice it, that is tight. Like tighter than tight. Every single cap is well within 1% tolerance, never mind the 3% advertised. This is a fairly elite level of tolerance - for example, a 10% cap could measure anywhere from ~5uF to 6.2uF. A 5% cap could be anywhere from 5.3 to 5.9uF. Not a single one of this batch of ten exceeds 1% from advertised.
How do they sound? Not going there. Tony Gee has a pretty hilarious page dedicated to caps where he covers a relative of these, you can seek it out if you want. I think he is pretty much full of shit - someday I plan on putting together a spreadsheet that can predict with a high degree of accuracy his cap rating system, YMMV
I am not going to clutter this post with additional graphics - but the 3.3uF and 4.7uF all measured within 1.5% (most within the 1%), as well.
Anyways, for an affordable way to load up the inventory - I can recommend these. Find them on Ebay.
I have a signature.