eBay seller earthbase
This was the top of the line unit from Guyatone in the day. The big brother to the EM-606. It is has longer delays (thus the long life) that can go into self feedback delays. I have played both the 606s and the 808s, and they are both nice machines. I find the 808 a bit beefier, with more input options, and more echo delay versatility to dial in your sound.
Amazing echo unit. It uses 8-track tape to loop with ! Delay time range is from a 1 tap (slap back) to all the way to long echoing multi-tap / self feedbacks. So classic. I think it is great for classic rock n' roll / Dick Dale surf rock-a-billy and even getting into reggae dub. I had a blast testing it. Guyatone is famous for their twang guitars and you could really see how this Echo Chamber fits into their roster. I hear a lot of guys/gals use this unit for drums and vocals too. They are also good for road gear because they are more reliable than the loose tape loop ones (roland space echos and so on).