Not car or boat audio related but just sharing..
I thought I had fried the output tubes in my Antique Sound Labs Wave20DT Monoblocks so I put them in mothballs last year. I didn't have the spare cash at the time to order a set of Quad Matched 6L6 Output tubes and a matched pair of ECC83's so I just put them away.
I think part of the problem was that at the time I did not have a good multimeter and couldn't manage to get the tube bias set at 330MV as per the instructions. So today I was cleaning out my closet to get boxes out for my Digital SLR (sold) and other stuff I am going to sell. And I dug out the tube amps and took them into my bedroom and hooked them up to the "Bedroom system" :) I have a Craftsman Professional Autoranging Multimeter now that I can connect to the PC and all that wooptie doo (still not as nice as a Fluke but I digress).
So I got the tubes biased and hooked the monoblocks up to my Onkyo system in the bedroom (see photo below to see what the bookshelf system looks like) I am running the speakers that came with the set from Onkyo and they have treated pulp mids with doped cloth tweets and they have a very smooth sound even when running off the integrated amp.
Off the tubes they are absolutely stellar! Soooooo Smoooooth... It's like butter melting in your mouth! No harshness at all, no fatigue ever, you can listen for hours.. And it's running flat on all the settings. I am running one of those little Sony 8" powered cube sub deals (SW8 or something) and it fills in the low end nicely!
Oh and the other great thing about tubes, I can turn down the heater in my room :D
And here is a shot of one of the amps (monoblocks) 25 watts Class A Push/Pull Design running dual 6L6 Output Tubes and single 12AX7 Tubes on the Input Stage.