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East Tennessee Talkbass

I have an old Acoustic 370 head that I'm selling. If you guys are interested let me know. I'd rather sell it locally because shipping won't be cheap for this beast

I advertised mine on Craig's list and an entire band drove from Boston to Nashville to buy it. Not saying that will happen for you, but clearly folks are motivated to go a step beyond the norm for something they can't get every day (especially if it's in great shape).
 
I am looking for 4 ohm. The head is an old Earth Super Bass. All tube, made in '73. I recently changed the 6L6's to 6550's and the power is punching my Hartke 410 in the nads.

I hear ya!!! I'm currently powering some 2x10s with a woppin' 30 watts of all tube power from my Ashdown Little Bastard. It sounds louder than the 225 watt solid state amp that I once used to power them.
 
I don't exactly know the conversion between tube and solid state wattage, but, my lead guitarist is my amp tech, and he guesses at around 5 to 600 watts. He was the one who convinced me to switch to 6550s. Now he is wiring in a supplemental transformer, to take the strain off of the output transformer. I tried the amp out once...and blew a fuse.
 
I am looking for 4 ohm. The head is an old Earth Super Bass. All tube, made in '73. I recently changed the 6L6's to 6550's and the power is punching my Hartke 410 in the nads.

Look for a used Audiokinesis TC115. They are 4ohm, take a lot of power, and have a great deal of healthy excursion built into the design of the speaker. You'll probably not want to play through your Hartke again after playing through it though.

P.S. Also make sure your amp is capable of handling the load a 4ohm cabinet will add to your system. Sounds like you have a knowledgeable amp tech so check with him if you're unsure.