Earlier in the year, I had purchased a Soviet nightvision binocular, designated 1PN33B, off Ebay for about $127. The binocular was reported as spare/non-working. Waiting for it to arrive, I was hoping it'd be something simple that was preventing it from turning on.

As soon as I got it, I saw that the state of the binocular was, well, it was in a pretty bad condition. Corrosions, scratches, rusts, and dirts were everywhere.Some parts were missing and some screws were stripped. I also ran in to another issue: how was I supposed to power this thing to test it?

So the binocular got shelved for the next eight months.

After December came around the corner, I finally got the drive and time to take the time to inspect the decrepit binocular. Disassembling instruction and original manual for this unit was difficult to find across Yandex, Google, and Duckduckgo after nearly half a dozen of hours spent researching online for useful bit of information to help me disassemble and understand how the unit works.

Using the alligator clips, I clipped them to the (+) and (-) 9v battery on one side, and clipped to the appropriate battery connectors on the binocular. I flipped the switch, but the binocular was still dark.

Grabbing the tools I had, I went and began to carefully examine and diassemble the binocular apart, beginning with the battery housing, and then the power supply housing.

Below you can see the power supply housing, containig the coils, resistors, capacitors, toggle switch, and bunch of wirings.

And as you can also see, the toggle switch is in poor shape.

I went ahead and disassembled the toggle switch down to its rudimentary parts and cleaned the surface until I could see the metal surface.

I re-assembled the binocular back together and did the test again with the 9v battery and alligator clips. It powers on.
Obviously trying to align my DSLR camera with the binocular didn't work well, but the pictures below are proof that the binocular was able to turn on after some minor cleaning to the toggle switch.

Tackling the next challenge: how would I use modern battery in the 1PN33B binocular?

I looked inside the battery housing and saw that the battery liner was removable. Before bothering to remove the liner, I put the 9v battery end up to the battery housing opening to see if the diameter would be wide enough to fit the battery in.

It can, if the shell of the 9v battery was removed and the battery liner inside the housing was removed.

In order to remove the liner, two small screws need to be undone, then once they are removed, the liner can be pulled out with ease.

Once the liner was removed, the shell on the 9v battery also need to come off.

With the battery cover now removed, the 9v battery can slide inside the housing. Make sure the correct battery terminals match up with the binocular battery terminals.  If not, reverse the polarity and then try again.

Enjoy the binocular!