All- I just wanted to express my sincere gratitude to Dave and his level of service. I bought a used A.M.P. BH-420 off of a fellow TBer (ElDave777, this is not Dave from Thunderfunk). I got it for a great price from a great guy. It was generally speaking in good working order, but was missing one of the two input jacks, had some minor wiring issues (limiter was not working, etc) and had some other minor issues (missing knob caps, dirty pots, etc). More or less the things you would expect for a 15+ yr old amp. Anyway, I inquired to Dave at Thunderfunk about him fixing the issues and giving it a good going over. Dave was quick to respond. I sent the head off to Dave. He promptly sent me an email explaining exactly what needed to be fixed and a couple suggested upgrades that he could do (heatsinks on the transistors, replace some caps that are known to go bad with better ones that are used in the Thunderfunks, etc). He did all of the work in a very short amount of time, shipped it and sent me a tracking number. Upon getting the amp. I noticed right away that my baby looked like it had been on the "Amp Makeover Show". The input jack had been replaced, knobs replaced and caps put on, etc. I popped the amp open and noticed a lot of new wiring, new caps and somehow he made the interior look almost like the day it rolled off of the assembly line. It just looked clean and near new inside and out. All pots now function with no noise, etc. Dave was also kind enough to give me some history on my particular head stating that it was one of the last BH-420's made and that it actually had the same circuit boards in it as the Gibson prototypes, etc (vs most other BH-420's). Dave charged me what I feel was an extremely reasonable price for his work. Based upon what I just witnessed for his level of communication, attention to detail and sheer love for what he is doing, I know what my next amp will be... a Thunderfunk! I love the A.M.P. BH-420, so why not get the new and improved version of my A.M.P.? The more time I spend with the A.M.P., the more I love it. I'll always keep it around to as a backup/practice head and use the Thunderfunk to gig with. Anybody want to buy a Kustom Groove Bass ? Bottom line, don't hesitate to go to Dave for your amp needs, especially if you are looking to buy new. He and his company are top notch! I'll upload some before and after shots of my A.M.P. this eve.