Hi all...this is my first post, but have been sporadically reading through the forums here and really appreciate the breadth of knowledge available here to those who thirst for it.
I have an Iwatsu Oscilloscope model # SS-6122 given to me by a kind guy not too far away from me in a "to-be-repaired" state last year and finally got around to it just a few weeks ago. There was no display, nothing at all on screen, while the fan seems to be running perfectly fine. I started troubleshooting and tearing it down, and eventually found that the CRT filament or heater (it's indirectly heated cathode) is open. So the CRT has to be replaced. I hate to just let it go, seems like a perfectly good scope for troubleshooting purposes, in the hope of finding CRT replacement one day. Nothing turn up on my searches other than used ones on Ebay which I did not really think would suit with what I had in mind - it's just does not make sense to buy a broken or semi functioning scope just to take the CRT and then I will be left with another set that would be up for repair again.
I ventured around and found a site that sells used and new CRT's mostly for Tek's in BC, Canada called Sphere Research and chanced upon their posting of a NOS, Kikusui COS 6100 Oscilloscope CRT. This Kikusui model is about the same specs as my Iwatsu. Since both scopes are produced from the same country, Japan, and maybe about the same era, I asked for pictures of it for comparison. Unfortunately, partial inspection of the external looks did not seem to point out that they are the same. My Iwatsu CRT had four pins sticking out on the side all connected somewhere on the boards (I am guessing these are for the horizontal and vertical deflections but not 100% sure) while the brand new Kikusui CRT only had two. Both CRT's uses Electrostatic deflection. The number of pins in the schematic are the same:14. My knowledge is limited and I could not really know for sure if these two CRT's are interchangeable, even if I have to slightly modify the interconnections, and hence I need the expertise of this forum. Here are more details and pictures:
Iwatsu SS-6122 : CRT p/n "SS 8212 B31" (this CRT is the same as that of Iwatsu model SS-5711 based on schematic)
Kikusui COS 6100 : CRT p/n "150BE B31"
I've included schematics of the CRT section here and pictures of the brand new CRT for the Kikusui COS 6100. Hope anybody can help me. Thanks in advance for whatever information you can throw at me.
Let me know if you need more information.
Cheers...
-Wzk