Balanced in/out Revox B77 Mk2

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Hi, I recently bought a Revox B77 Mk2 on ebay with Balanced in/out XLR connections . Could anyone help me find a circuit diagram for it - Or tell me any background on it? I intend to use it for live rcording with a diy mic pre-amp with transformer output.
It seems to have both input and output transformers behind the connector panel. A DRO says input is single ended (pin 1 and pin 2 are common with earth but not pin 3 - which I guess is the older convention?). Output appears balanced (pin 2 and pin 3 not common with pin 1 earth)
I cant find even a dwg for the PR99 anywhere - which I thought might be the same. Interested what the in / out impedances are supposed to be, and any other info.
Thanks for any help.
Rgds,
Martin

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Topic - Balanced in/out Revox B77 Mk2 - martin s 18:15:51 09/28/06 (2)

Re: Balanced in/out Revox B77 Mk2 - Cellist 08:16:04 10/30/06 (0)

Re: Balanced in/out Revox B77 Mk2 - Marantzguy 17:56:51 09/29/06 (0)

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