Erick – both the Hudy and PN-Racing truers can work on a 5Amp power supply.
— I have been using this $80, extremely portable power supply for at least 10 months:
e-slotcar.com > power-supplies > gophert-32v-5amp-power-supply-cps-3205ii
— This $60 small desk PS is also useful:
amazon > Dr.meter 30V/5A Variable Linear DC Bench Power Supply
A P/S (with a 5a, 10a or more capability) you previously used for 1/24 cars should also work.
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Without contact and with wheel(s) installed, the free-spin ‘load’ should range from 1.4a to 1.9a. This reference setting should be done with as small a free height as possible (since the tension from the drive belts add their own load). Voltage used is typically 3.0 – 3.5. Higher voltage needed for free-spin ~may be~ a symptom of bearings needing lube.
"... get on your bad motor scooter and ride!"
Sammy with Montrose