K5300 missing paint marking on flash tube

Kits General
1

Hello everyone -

I have almost finished assembling a K5300 “Stroboscope” kit, but I can’t find the polarity markings on the flash tube. Is there a way to identify the polarity of the tube in the absence of the “red paint mark” mentioned in the instructions?

Thanks in advance,

Mike

2

If the dot is missing (has never been reported before, strange…), then you will have to determine polarity by trial and error.
Careful: Make sure unit is fully discharged before attempting to touch/desolder flash bulb!

3

Thanks for the quick reply. I have to ask the obvious question: polarity reversal won’t damage the tube?

Thanks,

Mike

4

Shouldn’t be a problem, however, be careful, as the caps will not be discharged if the tube has not flashed.
Leave it alone for a while and check with a multimeter if they are fully discharged before attempting to touch any part of the circuit.
There’s a 50% chance it will work right away :slight_smile:

5

50%? My involvement ensures it will be near-zero :slight_smile:

Thanks for the help!

Mike