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This sounds right. Cassettes were like 55db no NR, 65 with Dobly B and maybe 70+ with Dolby C. Straight head VHS HiFi was at least 70db. You probably could add an outbound dBX box to boost that even further. The TEAC 2000XR 1/4" reel to reel with built in dBX claimed something like 90dB S/N.
I understood tape speed to be the big key to good recordings. Reel to reel at 15ips = the best. 7-1/2 and 3-3/4 ips degraded the sound. Weren't cassettes like 1-7/8ips and only 1/8" wide? If that holds, which I'm pretty sure it does, you'll want to use SP not EP for VHS HiFi recordings. Seemed like alignment issues were a drawback to using VHS HiFi and reel to reel units were well established with audiofiles. Neither format was moblie. And then, we enter the digital age with CD, DAT, CD-R, ...
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