Motorised input rotary selectors ALPS ASD1017 / Yamaha VT148400 were used in several Pioneer, Onkyo, Yamaha vinatage amplifiers. There were plastic gears that cracked during the time..
rotary selector 
cracked gears
Replacement gears were created using a precise 3D printer and tested for correct operation.
replacement gear (top) 
replacement gear (bottom) 
replaced gear in the assembly
Compatible devices: Pioneer A-501R, A-502R, A-701R, A-702R, Onkyo A 8051, 8940, 9510, 9511, 9711, 9911, Yamaha AX-1070 and more.
The part is also labeled Yamaha Rotary Switch SRBA Gold VT148400 in Yamaha devices.
Compatible with ALPS ASD1016 Input Selector.
Compatible also with Sansui AU-X517R amplifier.
Available in e-shop.
Dear Mr. Schiller,
I’ve got last year the gears for Alps motorized input selector from you. Now I finished the repair of my Pioneer A-602R. I replaced booth gears and it’s work fantastic. Many thanks for that?
Hi,
I have a defective Pioneer A501R from the 90’s which has developed gear problems on the input selector button motor (on the front panel) and on the input seletor switch assy motor gear (on the main PCB) as well. The gear on the main PCB switch is plipping (maybe broken), not turning the switch over, but motor spins, the gear on the front panel motor I checked yesterday and it has been broken apart heavily.
Is this gear in your offer also a replacement for the motor on the front panel input seletor rotary switch?
If not, which gear is needed to replace this one?
How can I buy the gears? I was unable to find a button or price.
Thanks for your reply.