Just finished "converting" two of these mono units to unbalanced operation. Bypassed both the input and output transformers. As the units will be used for playing master dubs of differing levels and would be fed from a fixed level (Cello) tape preamp, I added a front-panel-mounted input level control (to replace the little screwdriver-adjust-10 turn-internal jobbie).
After putting them both back together I measured levels "on the bench". With the new input level control set fully clockwise, the minimum input level needed to get the Dolby calibration tone to read up to the "dot" on the meter (on the front panel of the 361) was -8dB. 0dB came in around 10 o'clock on the input pot. Note that if you try to feed a 361 from a Seduction tape preamp, it may not have enough gain to drive the meter to Dolby level. Set the 361 output level to +3dB, which should match the inputs of most any preamps/line stages yet preserve plenty of headroom.
Sounds fine, although I don't have any Dolby A tapes that I would categorize as "A" grade.
Next up is the same "conversion" to the original Dolby A unit (can't remember the model number). The owner of both is kindly letting me keep everything for a while to compare the "sound" of each.
Charles