Hi team. I posted previously asking for e circuit diagram for this scope. I have since acquired one from Goodwill themselves so if anyone else needs it, I have it available in pdf format.
I have succeeded in getting the beast going (which is no mean feat for this old tinkerer) only to find what appears to be a dimming CRT. The thing is, when operating with a slow trace, (the 'blip' taking about a second to traverse the 5-inch screen) the CRT is as bright as I would expect it to be. However, if I start running the trace faster, it soon dims and almost disappears. Is this a symptom of a dying CRT or perhaps something like the blanking circuit not doing its job properly?
I know this is an old slapper of a scope but I have invested a lot of time and energy into it only to have to admit defeat and chuck it in at this stage. If the tube is gone, so be it, at least I have tried all I can to make it work. It irks me to see it nice and bright with a slow trace but increasingly invisible and dim with faster traces.
Thanks and the best of 2010 to al of you.
Dave Thompson.
I have succeeded in getting the beast going (which is no mean feat for this old tinkerer) only to find what appears to be a dimming CRT. The thing is, when operating with a slow trace, (the 'blip' taking about a second to traverse the 5-inch screen) the CRT is as bright as I would expect it to be. However, if I start running the trace faster, it soon dims and almost disappears. Is this a symptom of a dying CRT or perhaps something like the blanking circuit not doing its job properly?
I know this is an old slapper of a scope but I have invested a lot of time and energy into it only to have to admit defeat and chuck it in at this stage. If the tube is gone, so be it, at least I have tried all I can to make it work. It irks me to see it nice and bright with a slow trace but increasingly invisible and dim with faster traces.
Thanks and the best of 2010 to al of you.
Dave Thompson.