Idontknow Posted March 12 Share Posted March 12 I just acquired one of Kenny Russell's all new ST-70's https://getdynaco.com/products/ready-to-ship-dynaco-st-70-tube-stereo-amplifier based on the original circuit using 6GH8A military grade input tubes and EL34 NessTone output tubes. It's got the latest, best transformers and solid state rectifier which have several advantages. The unit utilizes the best components and after hearing this unit for the first time, I dropped my jaw in disbelief at the performance. The differences between this model and the Bob Latino and Will Vincent ST-70's are incredibly striking. This model Kenny did for me has a noticeably more classic, vintage sound signature as David Hafler intended it to be. It's silky, warm, lush and velvety smooth with jazz while the bass is tight and clean, even at the highest possible volume levels with my Heresy and Forte's with classic rock. There's no doubt that most of today's modern tube amps have lost the vintage sound signature with overly analytical, bright and brittle sound signatures, particularly those pouring in from China that most only seem to talk about. At first, it all sounds exciting, but over time with smooth jazz, I just found it to be a bit too ear fatiguing over longer listening durations and too forward. This ST70 Kenny did is the most amazing amp I've compared to date along with the ST35 and I think it's because both remain as close to the original circuit but with higher quality, more premium components available today. The famous review by David Gillespie here http://www.audioregenesis.com/documents/ST-70 Base Line Testing.pdf was adamant about retaining as much of Hafler's vintage ST70 sound signature as possible and this is the reason he's used it as a reference/benchmark. The issue of original vs modern was also covered here by Alan Acuff here http://santafemusic.blogspot.com/2008/09/tube-be-or-not-tube-be.html and I agree completely. Bob Latino addressed some of the issues with the original ST70 here https://dynacotubeaudio.forumotion.com/t465-traditional-driver-circuit-designs-versus-modern-all-triode-designs against his Triode Circuit that also has Pentode but I never enjoyed the Latino pentode circuit as much. It just sounded too lean for some reason, unlike the dedicated Ultra Linear circuit Kenny uses which simply tromps all over my Latino ST-70. The differences are mind blowing. 1 Quote Link to comment Share on other sites More sharing options...
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