If possible, Kindly check with a multimeter if your IC has GND in pin#4 and VCC in pin#7.
pin#3 GND, pin#4 -12V, pin#7 +12V
A LM318 is a candidate, though I have not see such a crude marking for such a part.
Good shot. But I am confused by the presence on the board of lm318 with normal markings. Accordingly, if it is lm318, then it should be somewhat special. Moreover, I have a second exactly the same board and the situation is the same with the chips: two normal lm318 and one with the same orange marking.
The soldering at the chip look rather poor - so maybe give it a try and resolder the pins.
One board is completely dead, other is noisy. For now, I'm documenting schematic and identifying unknown components. I haven't started the repair yet.
What type of gear is this ? This can give a hint what properties for the OP are needed and thus limit the possible candidates.
This is amplifier board from gamma spectrometry multichannel analyzer.
How important is it to recognize it? If you are repairing something here, do you have a schematic of the surrounding circuit?
LM318 pinout is the same as 99% if not 100% of DIP8 single channel opamps. Differences may exist on pins 1,5,8 → see point above.
Of course, if the chip has to be changed, I will start with lm318. But if possible, I would like to find out the manufacturer and the exact chip model so that after the repair the device does not worsen its characteristics. After documenting the schematic, I will add a schematic fragment with this chip to the topic.
Do you recognize the logo on this IC, does it appear on other chips in the same device? The "318" in LM318 would typically be preceded by letters "LM" or maybe other letters specific to an alternative manufacturer. A number consisting of all digits may be a proprietary part number of the manufacturer of this device.
Unfortunately the logo is not familiar to me. An orange marking with this logo is present on the single chip on the board. On the second same board, on the same chip, the marking looks exactly the same, but in worse quality. I'm pretty sure the device manufacturer didn't make chips, so it must be something standard.