![]() ![]() ![]() Technics SP10 + Mitch Cotter base + FR66s It was only stifled by the introduction of the CD player in 1982 and to a minor degree by the revived interest in the classic suspended sub-chassis belt-drive system within the audiophile community.Īlthough I was exposed to some of the great direct drive turntables from the 70s, like the Luxman PD444 and the Technics SP10 MkII in a Mitch Cotter base in the home system of my late DIY audio mentor Tom Cadawas, I never had a direct drive turntable in my audio system till now. The 70s through the early 80s was the era of great development in direct drive turntable technology. This combination is as close as I could get to my 76/6SN7 line stage.īut don't limit yourself to this report, use it as a starting point for your loctal tube rolling adventure. Each half of the 7AF7 is direct coupled to half of a 7N7 configured as the cathode follower. The slightly lower transconductance and amplification factor mimics the exotic tonal qualities of its grandad, the 76. ![]() My ears finally chose the 7AF7 as the voltage amplifier for the line stage. I made an exception in wiring this line stage so that I could exploit the 7AF7 vs. Typically, I don't split halves of twin triodes for left and right channels. However, it was too much for a zero feedback single stage line amp. With an amplification factor of 48, the 7F8 did not have enough gain as an RIAA phono preamp. But ultimately, it was the ubiquitous 7N7 (loctal 6SN7) that gave me the tonal balance I wanted, with the 7AF7 as alternate. I initially set up the phono section to use the unique 7F8 loctal in the cathode follower position, hoping that the 7F8's greater transconductance will produce a darker and more robust sound. ![]()
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