From MetroAmp Wiki
Metroamp replica of the Drake 1203-80 power transformer in a vertical or "stand up" mounting style. Hense the "MS" suffix.
Specs
Primary 120, 220 and 240V AC, 50 or 60Hz operation
Secondaries
6.3V AC @ 8A heater supply
95V AC bias supply
high voltage supply with 80% taps for voltage switching option (as used in Metroamp 12 Series amps).
Typical B+ voltages: 490V (full secondary), 400V (80% secondary taps) rated at 450mA.
Prior to April 2008 the color code is indicated here: Media:1203-80-MS OLD.gif
