I have access to different 6v6 tubes and wondering which would be the best of these for clean tone in a 5 watt tube guitar amp. I want to prevent the amp from going into breakup as far as I can when turned up loud. I hope this is a fair question for you tube experts. The two 5 watt amps I would use would either be a Bugera V5 or a Monoprice 5 watt and the speaker is a 8" Eminence. Pre amp tube questions will come later. If need be, I will also opt for hi end tubes. The tubes are= RCA 6C6 c GE 6V6 gta Delco 6v6 gt Motorola 6V6 gt Heinz Kauffman 6V6 g7 All of you have so much experience in rolling tubes, I really would like to know what you think!