I own a Dynaco ST-70, I have owned a McIntosh MC 30 and I have heard the Marantz 8b. The marantz sounded the best to me. The Dynaco was the cheapest of the 3 but still sounds decent. shay
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Marantz 8 (8B)best overall, Mc225 well rounded and neutral for then, at about 25 watts. The Dynaco at 15 watts or so in triode(30wpc normal) doesn't sound that good in triode wired mode IMO. The ST-70 is best for its midrange, when run in it full output(pentode) designed mode. Most pentodes usually don't sound any good when rewired to triode. They(ST-70) were designed for pentode operation. The ST-70 has better mids (tossup with the 8B) than the Mac, but tubby bass, and laid back highs. The EL34 Marantz and Dynaco have a lot of tubes to choose from,for rolling. The Mac sounds best with NOS Westinghouse, and good with other Nos 7591s.I havn't heard one with the new 7591 tubes.
It would be hard to compare those totally different(Dynaco named) amps to a Stereo 70. There is one for sale now that has different output transformers on it. Definitely not a Stereo 70 tranny. The others that are painted would be hard or impossible to tell what time frame they were from, as the company went through several different changes on in house made parts, to having them made for them outputs, and other parts. They look nice, and may sound nice, but everyone may have a different version. The one that's for sale now(with those outputs) could never be made to sound like the original.Nice looking though.