Battery Eliminator, Aerodyne's design.

[Yorkie]

I assume that the HT isn't stabilised, so the off-load voltage will be higher than when on load. I think the easiest way to check this would be by clipping a resistor of an approprate value across the output while observing the voltage. For example, from Ohms law, assuming a nominal HT current of say 27mA (0.027A) at 90 Volts: 90/0.027 = 3,300 Ohms, so a resistor of 3k3 at 90 Volts will pass 27mA. As to Wattage, 90V x 0.027 A = 2.43, so a 2.5 Watt 3k3 resistor should do the trick.

Hope that helps.

David