Bugera 6550B Power Tubes (DEMO)Whether you're looking for a single tube or a matched set, Redone suggests you trust your tone to tubes you can rely on. Bugera valves are subjected to rigorous testing to ensure you'll get great tone right out of the box. First, these 6550B power tubes must pass a 48 hour burn in where it's pushed to the limit. Next, a vibration table test ensures the structural integrity of each 65506 will stand up to your gig schedule. After its been warmed up and