If you are thinking of building this amp , let me say that between Trinity, S2 and tubetramp.com, I'm up and running for $650 US. Stephen from Trinity graciously responded to all my emails (promptly) and made good on a couple of missing pieces. His builder's manual is very helpful. He helped mr diagnose a bad wire run ,, my error. The chassis required NO extra work. A pleasure to deal with and obviously passionate about the 18 Watt world. I took my new amp and a 4 x 10 Marshall cab to rehearsal Friday night and WOW ,,, all I can say is WOW. No serious problems in getting her up and running with no squeal or abnormal hum. High gain heaven! I regularly play through 5 different amps and this one has the lowest noise floor. I usually have to switch off my compresor between songs, but not with this one. I was using the normal channel and 3 pedals, wah, blues driver and a compressor. Live rehearsal testing of the TMB channel is next, my son will probably be in the drivers's seat on that one. His bandmates will flip !