The GFA-535 was originally introduced in 1987, and superceded by the Mk II version in around 1991, so I guess it is sort of 'semi-vintage.'
In terms of sound, I have not heard the integrateds you mention, but I think the '535 is a very fine unit that performs WAY above its price-point. This little 60 wpc amp plays more like it's got 100 or even 120 watts on tap. It is a high-current design capable of driving some pretty difficult speakers. It is very smooth and neutral sounding up top, and has enough cahones to produce tight powerful bass with most speakers. The '535 is also well-built and very durable. I've owned one since about 1990, and it's seen nearly daily use with nary a hiccup.
The original '535 had some funky twist-lock speaker wire connections that would only accept pins or bare wire. These were replaced on the '535II with standard 5-way binding posts. There were probably some minor internal tweaks, but the binding post upgrade was the most obvious change.I'm not trying to de-rail this thread, but can anyone shed some light on the differences between the GFA-535 and the GFA-535II (other than the lack of the speaker selection switch)?
The GFA-5#5 are based on Nelson Pass design for Adcom, the Mk-2 are by Walt Morrey and address cost-cuting in the Mk-1 version. Slightly different circuit, better connectors, similarly robust otherwise.The original '535 had some funky twist-lock speaker wire connections that would only accept pins or bare wire. These were replaced on the '535II with standard 5-way binding posts. There were probably some minor internal tweaks, but the binding post upgrade was the most obvious change.