Ref: i2

Change your (-)NEG Tram Power Bombs to (+)POS

One of the batteries used in the tram power supply is the SG13 or A13 which is 11.6 x 5.4 mm. If you use the SG12 or A12 which is 11.6 x 4.2mm the battery can be fitted upside down. You might have to open the battery compartment contacts a little, however the power supply will then work with all (+)POs powered microphones.

Good luck!

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