Hi all. I've recently acquired a Battlezone cabaret (newbie here) and just discovered the big filter caps on the deflection board are not 2x 6700 uF but instead 1x 4700 uF and 2x 2200 uF. I suspect the latter caps are wired in parallel, so I figure I have the equivalent 2x 4500 uF.
The display is very playable, but the vectors are a bit crinkly. I suspect this "under capping" would be the cause of this. (Too much AC ripple?) Could anybody confirm or deny? I wonder if this is a well-known substitution trick and not anything to be concerned about. I don't have access to an oscilloscope to measure.
Also, but perhaps unrelated, the HV, focus, brightness, and contrast knobs are all set relatively high. I am unable to make the display show spiderwebs (not that I really want to, but this may be indicating something.) All of the monitor voltages check OK, perhaps a little higher than what is in the schematics but plausible because of the high settings. (Did NOT check HV anode voltage.) I am guessing possible leakage or tired transistors somewhere in the Z-amp?
Any insight welcome, including where to buy high quality new 6700 uFs, thanks!
The display is very playable, but the vectors are a bit crinkly. I suspect this "under capping" would be the cause of this. (Too much AC ripple?) Could anybody confirm or deny? I wonder if this is a well-known substitution trick and not anything to be concerned about. I don't have access to an oscilloscope to measure.
Also, but perhaps unrelated, the HV, focus, brightness, and contrast knobs are all set relatively high. I am unable to make the display show spiderwebs (not that I really want to, but this may be indicating something.) All of the monitor voltages check OK, perhaps a little higher than what is in the schematics but plausible because of the high settings. (Did NOT check HV anode voltage.) I am guessing possible leakage or tired transistors somewhere in the Z-amp?
Any insight welcome, including where to buy high quality new 6700 uFs, thanks!

