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In Reply to: RE: REVIEW: Dynaco Dynaco ST-70 KIT Amplifier (Tube) posted by rgurney on March 19, 2009 at 01:35:42
I already own Bob's ST 70 and I plan on adding the 120 soon. What sonic differences do you notice in these two amps? I'm assuming the 120 will get you better dynamics and a greater sense of ease while retaining the superb musicality of the 70. For the record, I'm using Gold Lion KT 88s ( re-issue ) in the 70 and would use the same tube in the 120. Thanks for your thoughts.
Follow Ups:
Yes the 120, having more power, will get better dynamics and may better fit less efficient speakers. It is designed to use the KT88. I am using Ei KT-90 tubes in mine. The 70 can be used with a wider range of tubes - I'm using the new re-issue Gold Lion KT-66.
In both I replaced the stock output caps with the Russian K40y9 caps. A nice inexpensive upgrade even recommended by Bob.
Yes, my speakers are 88 db and although the 70 does a great job, the 120 might be a more ideal fit. That said, the 70 isn't going anywhere regardless. You'd be hard pressed to find its equal at a minimum of twice the price. I too am very curious about both the re-issue KT 66 and 77.
The ST-70 is optimized for 5881, 6L6, KT66, and KT77
The ST-120 is optimized for 6550, KT88, and KT90.
My personal preference for the 70 is the KT-66; for the 120, it's the KT-90.
Enjoy.
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