Hi all,
I recently picked up a couple of 7904s with a stack of plugins. While most of the plugins are OK, the mainframes have some problems. One of them looks very good but is completely dead despite having intact fuses. It doesn't even tick. The other looks like it's had a hard life but at least powers up. The vertical and horizontal systems work OK but the calibrator and the readout do not. Also the displays look Ok when the beam is at the lower part of the screen but develop a kink when it is shifted upwards. The geometry and astigmatism controls do not correct it. This happens regardless of the vertical or horizontal settings and al all timebase speeds. Is this a sign of a damaged CRT?
I'd like to end up with two working 7904s but If the CRT is the problem than I might as well try to make one good one by swapping modules.
Any advice gratefully received!
Morris
