24-03-2018, 01:49 PM
(22-03-2018, 11:11 PM)John Cornforth Wrote: For the later Ruby, I believe the resistor in the bulkhead CFR unit is 3 ohms. I would expect a similar value in the earlier style unit mounted atop the dynamo. It roughly halves the field current when in circuit, and will dissipate a few watts. The value isn't critical, a commercial type of 3.3 ohms rated at say 5 or 10 watts would be worth a try.
Many thanks for your helpful reply, John.