I'm super excited and have been waiting a few days to pick up this baby. I know it's late 70's but, I will need to open her up to see the date. Excellent condition for the year and sounds great to boot. Couldn't be happier. Looks like it still has NOS Magnavox 7072's it still. Should I pick up a new set as not to wear these out? I plugged it into a sealed Ampeg 15 and then a sealed 410. Sounds great and had alot of punch playing on the A string. I noticed that lows kinda cut out on the closed E. Anybody have any tips on how to remedy that? Should I try pairing it with 412's? I'm just giddy! It was a coin toss between this amp and an American Peavey Cirrus. I now know I made the right choice.