I have an ATN MK238 that will power up, like the
Hello, it has a none functioning image intensifier tube, or shorted ccfl. All the electronic components are manufactured in Russia. Does this let you know what wrong with you ATN MK238 scope now...it's cheap. I don't fix these ATN MK-258 anymore, it to hard to find parts. ATN is no help, they won't sell parts. It will have to be sent to ATN for repairs at approx. $200+ for repairs. I do have a couple of Russian image intensifier tubes, that work. The last MK238 I repaired, I had to build a ccfl (cold cathode flourscent Lamp) inverter, replace the coil and voltage multiplier, and fit in a confine space with insulation from electric arcing.
Here is infor for you. The ccfl can be purchased. They are companys that will make you a voltage multipliers. So, here is information: voltage to ccfl (6 volts) then the voltage goes in the inverter
to convert it switching DC voltage (5.5 volts). Then the coil (transformer) step it ot about 930 voltage to the voltage multiplier (which has four stages---the first stage with double the voltage to 1860 volt to the second stage which double it, then third stage which double it, then finally to fourth stage which doubles the third stage to about 15KV (hight voltage here, it will bit ya here, but no current--amps.) this will the cathode on iit, then light up the tube 18mm film that is coated--it will turn green)
Now, this the simplies way of tube operation, it more complex than that. The power supply for this Russian image inten. tube is sealed in dielectric jell, and the voltage multiplier is sealed in epoxy with the tube are none repairable.
There are quit a few other NV companies, that use Russian tubes and electronic. They cheap but functional. The bottom line here is the profit. Don't get me wrong here. There a few Russian compies that make some very good gen 2 tubes. If you can replace the tube will gen 2 tubes and powere supply. I hope this helps, Richard.
on Aug 01, 2011