1970's Audio Research Equipment, worth having?

I will offer a somewhat differing view. I agree with the above comments that the hybrids marked a downturn in ARC products-- at least to the qualities I listen for. I have worked on most of their gear up to the mid-1990s. The best amp they ever made, IMHO, was the M-100 and the best preamp being the SP-10 (although keeping 12 quiet tubes in it was a challenge). However, do not assume that the 70s vintage stuff is over the hill. Updating the coupling caps, some resisitors and the feedback caps will give you an amp, or preamp, that is highly competitive. If you are technically inclined, some work on the power supply will then give you an amp or preamp that is as good as you can buy. The output transformers of the 70s tube amps are excellent quality.

one thing is for sure stay away from a d90 man did those things blow up, the d250 on the other hand was a fine amp and very reliable even with all those tubes, d79 also was a great amp very big and heavy though, same with the 250

Thanks for the info received so far. It is interesting how even a well respected company can bring out a new product that is not an improvement over past models. ARC has been around for a long time in audio terms. I wonder how many companies today will be around in 30 years? Take a look at an issue of High Fidelity from the 70's and see how many companies have come and gone.

I bought an ARC D76A from Lyric in 1977. I sold it to a friend about 8 years ago. I continue to be impressed with that magical midrange (he is using it to to drive a MG 3.6). I still regret selling it to him. I also owned the D115 MKII for 12 years. I now own the VT100 MKII.

The topolgy of the VT100 is essentially the same as the D76A, with better parts and beefier power supply with solid state power regulation. All of these amps are very smooth and musical. The VT100 MKII is more refined and transparent with greater control and punch in the midbass and bass.

My oldest piece of equipment is an ARC SP9 mkII preamp. Perhaps not the best ARC as done, but certainly not the worst. A few years back I listened to the LS25 thinking it might be time to upgrade. While I felt it was a definite improvement, it also had a high price tag. As I was looking at alternatives, I stumbled on Steve Huntley at Great Northern Sound who does mods on much of the ARC gear. After much discussion with Steve, I had him apply his reference mod on my SP9 and have to say the results were simply remarkable.

Steve knows ARC gear inside out (he used to work for them) and if there's a particular piece you're interested in, I'd definitely give him a call... www.greatnorthernsound.com