From MetroAmp Wiki
Mercury Magnetics P4550JT-G2 power transformer for JTM 45 and 50 watt Marshalls.
B+ voltage with tube rectification is approx. 355V
B+ voltage with solid state rectification is approx. 420V
Mounting style is laydown (horizontal mount). Mounting centers are: 3" x 3 1/4"
Media:ToneClone P4550JT-G2.pdf
In use: Metro JTM 45 Kit
A picture of a P4550JT-G2 wired into a Metro JTM 45 kit chassis.
See also: P4550JT-G2M
In use: Metro 50 Watt Kit
P4550JT-G2 wired into a Metro 50W plexi chassis.
In this application:
- The "COM" terminal corresponds to the orange, common primary connection in the instructions.
- Terminals 6,7 and 8 are the high voltage secondary. 7 is the center tap, which gets grounded. 6 and 8 go to the diode bridge terminals marked AC (~). And 6 also supplies raw voltage to the bias circuit.
- Terminals 9,10 and 11 are the 6.3V AC heater supply. 10 gets grounded. 9 ans 11 correspond to the green wires in the instructions and go to V5, pins 2 and 7.
- Terminals 12 and 13 are not used.
- The Teflon coated wires (Black, Brown, Red and Yellow) are AC primary taps. The correct voltage tap (see diagram) should be connected to the power switch.
Discussion
A long thread discussing this PT is located HERE.