I have been a fan of older Denon equipment for quite some time. I have owned my DRA-825R since '91 and recently picked up a DRA-835R that needed some minor repair. These are very similar to your DRA-1025RA. These receivers utilize Denon's "Optical Class A" amplifiers. The was a DRA-1025R followed by the DRA-1025RA followed by the DRA-1035R. The R and the RA appear to be functionally and physically identical. However, their main amp boards are very different. Spec wise, the R is rated at 125W/ch while the RA is rated 130W/ch. Other than that the specs are identical.
The DRA-1035R is different in function and internals. It utilizes Denon's "NEW Optical Class A" amp (what ever that means). The layout of the main amp is much more symmetrical for left and right channels and I believe that the power supply is a little more beefy.
As the 825R and 835R are very similar to the 1025R and 1035R respectively, I'll use my receivers for comparisons. I am very impressed with the build quality of the 835R over my 825R. The 825R suffered from several bad solder connections. I went over all the boards and this is no longer a problem. I can't speak for the RA version.
The jury is still out on sound quality as I just repaired and tweaked up the 835R. I plan to tweak the 825R and do a side-by-side comparison in the future.
Stan
The DRA-1035R is different in function and internals. It utilizes Denon's "NEW Optical Class A" amp (what ever that means). The layout of the main amp is much more symmetrical for left and right channels and I believe that the power supply is a little more beefy.
As the 825R and 835R are very similar to the 1025R and 1035R respectively, I'll use my receivers for comparisons. I am very impressed with the build quality of the 835R over my 825R. The 825R suffered from several bad solder connections. I went over all the boards and this is no longer a problem. I can't speak for the RA version.
The jury is still out on sound quality as I just repaired and tweaked up the 835R. I plan to tweak the 825R and do a side-by-side comparison in the future.
Stan