Howdy Marshall Fam! Sooo, looks like I could have my hands on a fantastic condition 84' 2205 head (USA) for about a grand. Aside from my DSL50, DSL100, 3315, and 3310s, this may be getting near completion for me. I have a few Boogie Mark III heads that I haven't been using and may end up doing a trade on one. How does the 6550s compare to running EL34s?? I'm an EL34 man and have no experience with the 6550s so that may be my ONLY barrier at this moment. Please let me know why I need this amp as new member of my Marshall gang! Thank you, Fam.