Dolby circuit version Reel Deck, L/R mic inputs, mic, line, output controls, high/low speed. Calibrated to Maxell UD or XL Bias 1 EQ 1. Excellent calibration, heads 85%. Cleaned interior/exterior of unit, cleaned/lubed all switches, jacks, pots, controls. Installed 2 new hub break pads. 8+/condition, excellent cosmetics.