It seems to me I've been working awfully hard to get the tone I desire out of my TH500. I have it paired with two Aguilar SL112 cabs and it just seems to be more vintage-y than I like. It's very difficult to get a modern tone out of it. And believe me I've researched all of the settings and followed everyone's advice. I picked up a used Ampeg PF-500 and tried it out at a gig and I was blown away - all of the modern tone I wanted without much work - Set the gain as instructed in the manual, Engage Ultra Low and Ultra High, Set the Bass at 1 o'clock, dial out a touch of high mids at position 4, turn the tweeters down to 1/2 on the cabs. For slap, roll the midrange selector back to either position 3 or position 2 and it's all good. Here is my dilemna. I'm not sure if I should sell the TH500 (awfully expensive to keep around for a backup amp) and keep my trusty Peavey Nitrobass as a backup, or sell both the PF-500 and the TH500 and use those funds to purchase an Ampeg PF-800? I've read of reliability problems with the PF-500. How do I tell if I'm going to have this problem? Or should I just take my chances with it? Will a PF-800 blow my SL112 cabs up? Any advice or opinions welcome. I've put the options as I see them in a poll.