The stock electrolytics arent bad sounding but films are an upgrade. Im not good at the audio jargon but I noticed and overall cleaner midrange and cleaner, more extended and detailed treble. There is a little bit of grain up top with the stock caps that you may not notice until the films are installed, I didnt. Bass is more controlled as well. At first I thought there was less impact, but I dont think that's the case. The overall balance is improved and bass just isnt as "tubby", it's more accurate. I did the films before Speedball where most upgrade them afterwards. From what others have mentioned, I think I noticed the difference with the film caps more than some others because I did them pre-speedball. Improvement from Speedball was even bigger, as you already know. But my point is that some have called the film caps a fairly subtle improvement. Adding them before Speedball, I found the change more than subtle, so YMMV. But I think it's definitely a worthwhile upgrade.
I also used the Mundorf MKP's.
Most of the gurus here dont recommend bypassing the output caps. But if you have some films laying around, it cant hurt to try it. I thought about it, but just went ahead and sprung for the film caps. Mundorf MKP's were "affordable" and Parts Connexion had a 20% off at the time. The Solens/Axons and some others are even less expensive. I thought about trying Erse Pulse-X mkps's (about $20 for 250V 100uF) but spent the extra on the Mundorfs to "play it safe".
