My experience is that NO F1 decoder works well with 16-bit recordings made at EP speed. I also think
that later VHS machines with auto-tracking may not align best for F1 recovery because they were
designed to also take into account VHS-HIFI signal. A professional-quality VHS deck, even a late-era
VHS-HIFI deck, will have a tracking control, but the consumer models lost the tracking control
shortly after VHS-HIFI was developed.
I'm curious, what sort of material are you working with and how many tapes?
-- Tom Fine
----- Original Message -----
From: "John Gledhill" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, December 11, 2014 4:45 PM
Subject: [ARSCLIST] Sony 601-esd pcm audiio processor decoder
>I am recovering sony F1 type audio (PCM and ECC in the video image) from some VHS tapes (ep speed 6
>hr per tape) - it was actually recorded with a Toshiba version.
> I have the manual for the Sony 601-esd and I think is says the boobie lights (Red, FlashRed,
> FlashGreen, FlashGreen, SteadyGreen) is a logical procession from poor signal to good signal.
> Additionally there is a tracking indicator (bar graph moving to the right)
> I can see from the schematic the LED's are driven from the decoding logic (didn't really need a
> schematic for that one).
> However, I an not find out at which point errors are still being corrected (apparently a few red
> flashes are fine) and at what point I can not count on the data.
> I am recovering through the spdif -> PC.
> I am hoping there there is a audio archivists list with somebody who used these 30 years ago and
> thought to ask Sony exactly what was being measured with the lights.
> P.S. I found the Sony 601-esd encoder/decoder is not a good match with most later model VCR's and
> ep tapes. (the data on the back of a VCR switch disappeared years ago).
> John Gledhill
> BIT WORKS Inc.
> 905 881 2733
> [log in to unmask]