EL-34 tubes in Rogue M-150 amps

I am considering rolling some EL-34 output tubes into my M-150's monos. I would appreciate Rogue owners opinion of the EL-34 in these amps and any suggestions regarding which brand of tube to use. Currently using the Golden Lion KT-88 reissues which sound very good but as always I am curious about how something different will sound. Thanks