the original neon bulb of the SP10MKII was confirmed dead.
I removed the original neon bulb and tried to make an alternative.
the strobe circuit of the SP10MKII is "flashing" at a frequency of about 105Hz at 33 1/3 rpm and about 142Hz at 45 rpm.
using LED(s) to replace the neon lamp is easy and simple.
I've made a small PCB that use the original neon mounting holes.
in order to keep it compact, SMD LEDs were used (size 0805), there is a total of three LEDs driven by a small transistor. everything is powered by a single 5V DC (from the SP10KII control board)
it looks cool, isn't it?
everything just fit to the original neon bulb mount and it also runs cooler.
yeah, here we go, the orange LEDs looks pretty good.
I can remove the 140V DC supply section now as it's only used to power the neon blub which is no longer used anymore.