It's been a little over a year and a half with the stock tubes on my Rect-O-Verb head. I am begining to hear microphonics and random crackles and pops so I'm deciding on a fresh re-tube (Power+Pre). I use the 6L6 setting, so could some people pitch in and recommend me what brand I should go with. Price is an issue, so I would like to go with something that has a good value. I've heard about the Chinese Tung Sols and they seem very appealing for the sound I need. I'm looking for a big warm crunchy sound. Good amount of gain and a fat clean sound. I pair my head with a 1x12 Classic Cabinet with a V30 in it for an idea. I appreciate your replies.