Emerson Model 698 Series B

[Kevin Kuehn]

Originally Posted by dieseljeep

I looks like there was real problems with horizontal sweep. A bit of hack work, at it's best. I did the nut trick, when the adjustment slot got damaged, by using the wrong tool.
I'm trying to remember if other Emerson models used the air-core Flyback.

This is my favorite hack repair so far - Looks like someone snapped off a section of a couplate to replace a 5000pf capacitor in the sync separator circuit. It has .003 penciled in the upper left hand corner. At least they put some corona dope on the edge for insulation.

[dieseljeep]

Originally Posted by Kevin Kuehn

This is my favorite hack repair so far - Looks like someone snapped off a section of a couplate to replace a 5000pf capacitor in the sync separator circuit. It has .003 penciled in the upper left hand corner. At least they put some corona dope on the edge for insulation.

The original owner of the set must've quit using the set, years ago. There's a lot of nasty capacitors that need replacing. It looks like a ratty junk was used for replacement parts, which you were referring to.
What EIA code is on the CRT? I don't think it's a RCA sourced tube.

[Kevin Kuehn]

EIA code 210, which I think is Hytron. The CRT tested very weak(like lower third of the bad scale), but I have a GE replacement here that should work fine.

I discovered last night that my flyback primary tap going to the HOT is open. I have a Thordarson Fly-2 ordered that supposedly subs. I also noticed that the vertical output primary resistance reads about double what's it's suppose too. Looks like this restoration should be a lot of fun before it's over.

[Kevin Kuehn]

While waiting on parts I decided to remove the CRT and do some basic above chassis clean up. Apparently this set was kept in a location that allowed condensation to form and drip off the CRT. It's the only place there is significant rust on the chassis.


I also found the break in my flybacks high voltage winding. It was hiding under a piece of insulation tubing going between the windings and the coil tap terminal. Unfortunately I found it after I'd already unwound a couple dozen turns off the HV donut. I was able to re-flow the wax around the HV donut, and everything is ohming out reasonably close. Only time will tell if I messed up my HV by removing those windings. Not sure if I can get away with running the HV winding wire directly to the solder cup. I suppose it could arc to something and vaporize that tiny wire.