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As you probably know that internal electronic are manufactured in Russia. I just repair an ATN MK238. Verything from the image intensifier tube to power supply was shot. I managed to round up 1 gen green Russian image tube, but the ccfl inverter, tolorid coil, voltage multiplier I had to manufactured them. Sorry, wish that I could be more help. stewbison
Jeepers! I have work on these ATN MK238 before. All internal electronic are made in Russia. There are two major problem with them. Image intensifier tube goes lights out, the ccfl inver, coil and voltage multiplier are seal in dielectric jell and epoxy. can't work of them. I can work on them, but I am not. Who ever work on it will need to install a new image tube, manufacture ccfl inverter, fine a coil and manufacture voltage multiplie and get the correct cathode ingnitor voltage, hard. Sorry, I wish you all the luck. They one more option send it ATN and before you send it call ask what the price will be, and get the guys name or record it. stewbison
Hi, the objective lens on this ATN MK238. Now these lenses are Russian Optics
and they manufacture very good to excellent optics. Take the lens to a camera
shop, if they can fix it, then they will know who will. If you send it to ATN
they just throw away your lens and replace it with a new lens. If you are going
to replace the lens then up grade to 90mm to 100mm lens, OK. stewbsion
Battery OK, IR light up, no green image on the intensifier image tube, correct! What type of voices are you hearing? Give ATN Aries 390 two Zolof and wait two day, just kidding!!! The noise is a crackling, high freqencey hum, popping, etc. Also remove the eye lens, it screw off, then remove the scope to someplace where it semi dark. Turn it on and observe the 18mm white plate and see if it turn green---no green---no look see---no image intensifier tube, it dead that is the mage tube. stewbison.
When you are changing the DSP effect on the fly, static or noise is NORMAL !!! The DSP is changing the data and having to recalculate on the fly and doesn't mute itself while doing so which results in "garbage sounds out".
The bypass setting should NOT get any tone UNLESS you have feedback going on. If your guitar can "hear" the speakers in the amp, the strings can vibrate and get feedback going.
Unplug the guitar and see if high freq tone is still there on bypass. If the tone is in the musical range, then there is a problem if nothing is plugged in. If it is a VERY weak, very high frequency tone, this may be the digitizing noise from the DSP. On bypass, the audio is likely to still go through the DSP, just not be modified by it.
That high pitched noise you're hearing is the power supply telling you that it has too much of a load on it and lowered its operating frequency which in effect cuts its output way down! Normally you don't hear any thing since the power supply operates at a frequency that's beyond human hearing.
In an RCA this indicates more than likely that your horizontal output transistor is shorted and this short was caused by the flyback transformer shorting. This is a common happening with RCA's
You'd need to take to a tv shop and have it checked out.