KO PS-87Z fet servo

[brian s]

last time i ran one of these (many years ago) a choke had to be fitted in the power lead between the speedo and the fet box,does anyone know the value of the choke`s and where i can get some?.

[lllyf]

the servo that you mean is these? between the speedo and the fet box it is nothing.I have PS-87 and PS-88Z.

[brian s]

i have a ps87z and a ps302 both with the seperate fet box, and am pretty sure that if they were run without a `choke` in the power lead, then there was a good chance of interference from the speedo. i have found one now and will try the servo with and without the choke to see what happens.

[dodgydiy]

there were problems with interference generated by the pulses caused by the speed control drive frequency if i remember correctly, was worse with certain speed controls, especially the ones of the era that sported 'regenerative' braking. even modern 4 wire fet servo's still require a choke and they are quite cheap and easy to come by, nick adams at demon products will help you out if you have any trouble getting them. i have 2 ps87 still in cars and both going strong, not quite as fast as the modern ones but they still work after all these years, will the modern ones!

[93works]

anyone got one for sale? i would like to own one