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In Reply to: RE: Yet another Stereo 70 posted by mbnx01 on May 09, 2016 at 10:20:14
With an EF86 and 12AU7 driving PP EL34's, it sounds more like a variation on the Mullard circuit.
Dave
Follow Ups:
Each channel uses one EF-86 and one-half of a 12AU7 so it's not a Mullard. I would bet serious money the circuit is basically the same as the old Triode Electronics board for the ST70. That board used the same tube complement and is essentially the same topology as the stock Dyna design but implemented with separate tubes. Dyna's 7199 combines a pentode (similar to EF-86) and triode (similar to 12AU7) in a single tube. The Triode Electronics board uses a separate pentode for each channel but the dual-triode 12AU7 is shared by the two channels. The second stage in each case is a split-load phase inverter, not a Millard.
I see. Thanks for the correction!
Dave
I happen to really like the EF-86/12AU7 circuit. It allows the potential of Dyna's topology to be realized without concern for out-of-spec 7199 tubes. Frankly I think the ST70 doesn't get the respect it deserves. Properly implemented with the EF86/12AU7 and carefully selected parts, the ST70 is capable of high quality sound by any standard. Most people have never heard it under these conditions though.
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