20 Most Recent Yukon NVB Viking 3.5x40 RX Questions & Answers


Hello, clean the outside of the lens with a good optical cleaner. If you have, then trying adjusting the focus for each eye. Try both ends of this binocular at one eye at time; such as, left first, then the right eye until there are focused. That is if you can focus the optical end and they leave you with the eye lens for focus. Let me know how it works out. stewbsion

Yukon NVB Viking... | Answered on Aug 15, 2011


Hello, don't worry about it. It is HV to the image intensifier tube. The battery voltage goes through control circuit then to ccfl inverter (here is were dc voltage is switch on and off and switch dc voltage is step up by toroid coil that has two input and only two out puts). By impulsing the coil with two different switch dc voltage on the input this make the current lag the two different phase voltage by 90 degrees. Here is where the strange noise is coming from. The toroid coil is encased in iron case and if half of this iron case is loose, it makes case vibrate so the noise.


Now, the voltage come out of the toroid coil is switching dc (one could call it AC because that what AC voltage is, it switch between positive to negative) this voltage is about 300 to 900 switching DC voltage. This voltage will be applied to a 1/2 wave voltage multiplier (this voltage multiplier with have anywhere four four stages to 10 stages depend on what the input voltage to multiplier is.

Low the voltage out of the ccfl inverter the more stages the multiplier will have.



Now, the voltage multiplier will double the voltage per stage to need image intensifier tube voltage of 12000 to 45000 volts---DC switching or AC what ever one wants to call it. This voltage will bit you but it doesn't have a lot current associated with it, the current would be in the 10 to 15 ua (micro-amps) 1/10X6 amps.



Now, you know. GB...stewbison

Yukon Optics | Answered on Sep 24, 2011


put a dead mouse on it

Optics | Answered 15 hours ago


he i need a tripod to reflector telescop 525

Optics | Answered on Apr 14, 2019


We do not do appraisals.

Optics | Answered on Apr 14, 2019


We can't see what you have can we and it would be impossible to guess. All the models are pictured in the link

https://www.google.com/search?client=firefox-b-d&tbm=isch&q=springfield+precise+time

Optics | Answered on Apr 13, 2019


If it is a S&W, you will have to call them. They were sold on the M&P 15-22 Sport as part of a promotional package.

Optics | Answered on Apr 11, 2019

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