Computer says that between 1990 and 1998 I worked on 4 of those and that my co-workers worked on another 4.
This is a Hitachi built VCR and, going strictly by memory, I think its safe to say that their HI-FI VCR's of this era did not offer Dolby on the linear audio track.
I believe it's also safe to say that the "Hi-Filter" does not work the same as Dolby NR.
In fact I also believe it's a high filter for the HI-FI audio and does not affect the linear audio track.
And, from there I can offer no other information.
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