The Sony STR-7055 was made from 1972 until 1976. It has great clean and classic styling and looks especially good with the wood case. It was near top of the line with only the STR-7065 above it. It really looks nice when lit up as well. There was also an STR-7055A model that was made later in the production run around 1976-1978. No one really seems to know the difference between the two models.
As you can see it has large heatsinks that protrude out the back of the receiver. It also has connections for three sets of speakers. Overall this is a very good receiver. Sony made quite a few of them so they are somewhat common. It puts out 55 watts per channel into 4 ohms and weighs in at about 34 pounds.
The Sony STR-7055 will sell from $100.00 to over $200.00. One recently sold for $140.00 that was in great shape and worked perfectly (9-30-2011). The one pictured here was mine and it sold for $77.00. It was also in good condition with just some minor wear to the edges of the wood case. Everything worked properly. If you have a chance to pick one of these up at a decent price do so. They are great receivers.