10L43 Predicta no hv

[whatadish]

okay...good news, reasoning that because the grid had ac present I would likely be looking for a shorted cap. Sure enough found defective but NOS sprague .0047 video cathode bypass cap... just because it hasn't been used old is old and I should have checked it before installing it. Replaced cap and hot socket and violla got my -45v at grid and what do you know...full raster with snowy but good picture. Still no sound though...some audio buzzing. No redplating and a good 13.5 kv at anode. Any takers for the sound issue...6bq5 and output tranny test good. This had great audio before my buddy got a hold of it. My guess is that some people are a little timid about lifting that board...ground tabs are pretty fragile and heater grounds are directly connected to three of them. repaired a few foil pops while under there. time for some pizza and a Sam...then a little audio signal tracing. I love this site...pics to follow as soon as i remount the crt in its swivel.

[DaveWM]

keep at it audio I would start with a new detector tube, check voltages, look for broken tube sockets, check voltage on detector and audio out.

look for open quad coil, they have a pretty sharp peak so may be suffering from screwdriver drift.

[whatadish]

ugh...had a pretty nice picture for about ten minutes...went to start reassembly and lost hv again. completely removed board this time repaired a lot of foil pops and tears, repaired 5 or 6 traces...still no go on hot grid bias. Looks like tube sockets are next...most have broken pins. I need an outlet for 2 octals and 6 nine pin sockets. At least I know all trannys, coils, and crt are good. Alignment looked really good...I think the crt is new. Enough for this weekend though.