Hello - I am an old Les Paul Stnd/PAF thru an old Marshall guy about to buy a used 1977 Mesa Boogie Mark I 60 watt EQ model, no reverb, with a JBL. I'm not able to hear the amp before purchasing - but I've heard great things about these earlier Boogies - what can you all tell me about the overall tone and reliability of this model? I know that tone is really tough to describe - but any wisdom and tone description you can shed would be excellent. Thanks.