Yes, about so. But indeed it is more about perceived volume and low frequency content than just decibels. My modded 5w valve jr. Was about as loud as my 15w tube head for instance...sometimes wattage just provides general direction. My Ceria, when switched to 18w mode from 36w...no change in volume really, just much less low end. The 15w tube amp was loud enough with band but sounded like beehive, way too little low end power at those volumes. Id say around 40w tube and 60w ss is in most cases OK for band use with suitable speakers.
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Dee
"When life's a biatch, be a horny dog"
Amps: Marshall JVM 410H w/ Plexi Cap mod, Choke Mod & Negative Feedback Removal mod, 4x12", Behringer GMX110, Amplitube 3/StealthPedal
Half a dozen custom built/bastardized guitars all with EMG's, mostly 85's, Ibanez Artwood acoustic & Yamaha SGR bass, Epiphone Prophecy SG, Vox Wah, Pitchblack tuner plus assorted pedals, rack gear etc. for home studio use.