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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]