Magnavox Color Roundie

[tvcollector]

Well, I must say the mover could not have come at the worst time.. 7am without notice woke up by the mother saying this thing is not coming in the house.. And not to mention it was damaged during shipping.. The whole bottom is particle board and one of the legs failed during shipping.. The mover gave me half my money back... Looks like the whole bottom is just going to have to be replaced with plywood..





On the upper note, the pic tube came up right away, with blue a little weak, but seems to be climbing:

[Fairlane500skyliner]

Lovely find! Particleboard is a terrible product when used as part of the structure in heavy pieces like this. I have seen heaps of sets with a particleboard cabinet, and with the bottom of the set giving out and buckling around the legs - Definitely not safe for shipping with the legs attached.

[tvcollector]

Had to remove the whole chassis.. Looks like a cap has exploded entirely.. Probably got struck by lightning, I thought that was a fuse of sorts until I saw reminisce of a film cap.. I did try and power up on a variac, with ohm meter before I work the chassis out and at 60 volts it started to spark, meter was only reading .4 amp.. Has to just disconnect everything, some wires I don't know what goes where.. Have no choice other than to remove everything and then see what can be done with the cabinet.. If I would have left everything in, it would have just falling completely apart and I don't want pic tube to get damaged.. Now don't know where to go with the cabinet.. I'm not an expert at wood work..

Talk about 60 years of nicotine.. Wires are all slimy and the stuff just sticks to your hands and don't want to come off..






Red is looking better




Pic Tube = Spirit of 76 rebuilt of sorts

[DaveWM]

some epoxy should be able to fix that particle board, would be better to remove it, then put some wax paper down on the floor so the epoxy does not run everywhere. Have some would shaving handy to fill in voids from missing bits.

the slime is typical of magnavox, rubbing alcohol and ebow grease will get it fairly clean.

Pots tend to be noisy, lots of action behind those vert mount boards, easy to short wires out.

RCA clone but for the silly swap of the fly and power trans. Like rca the fly is the weak spot unless already replaced with a better one.

good chance it will work as is, since the safety cap is blown, may as well get it out of there, but the rest of the caps are from an era that was pretty good.

[tvcollector]

Oops I went ahead and used wood glue, and got it outside with cinder blocks piled on top.. I cut out that interlock cap like I did with the GE, have the chassis on the variac with the HV output tube removed, and the tubes are coming up slightly.. I did 30v at first for 15mins and now at 60 volts..

[DaveWM]

wood glue is fine, I just prefer thin (30min) epoxy since is can be more of structural element (esp if wood shavings are mixed in). Its a bit messy but works fine. You may need to backup the repair with some 1/4" wood triangles under the leg mounts, do them in all 4 corners of course to keep the height correct, and make them large enough to distribute the load.

[tvcollector]

I may go over the part that's glued with either a thin piece of wood or a metal flat strap that's rectangular.. And i'll bond that to the area with epoxy for even more support.. I hooked the speaker up to chassis and heard normal fuzz noise.. Tried to tune to a channel but don't hear noise to the sound of the tuner as I change channel.. Bump it up to 120 volts from 100 and heard and saw a pop near the power transformer.. Was drawing around the normal 1.3 amps.. All the filter caps stay cold..

[DaveWM]

should be more like 3.0 amps, guess is the HV is not working as that draws a lot of power. oh, maybe still no horz out tube installed then the 1.3 makes sence.

[Electronic M]

Another option would be to take that board to a wood working shop and ask them to make another one just like it out of plywood.

[tvcollector]

Originally Posted by Electronic M

Another option would be to take that board to a wood working shop and ask them to make another one just like it out of plywood.

I've thought of that too, but If the original can't be fixed.. I'll do that..

Whats the best solution to remove gunk and tar from the wires and PC boards.. I've been using rubbing alcohol, but I wonder if there is something better to use?

I know spatsbear on youtube puts the whole chassis of his sets in the dishwasher, but I not going to do that seeing how I don't even have a dishwasher..

I've got a station tuned into it now.. So looks like another simple fix.. Tuner is dirty, and the little plastic gears for the fine tuning are popping out, so not sure if I can fine tune a channel in..

[DaveWM]

Don't remove it. at least until after you have base lined the set to determine the current operating status.

After that, if you want to clean it, rubbing alcohol is good for the slime on the wires, q tips are good for cleaning the pcb. Just remember that the parts are very old so any cleaning has to be done gently, and generally is not needed for the set to operate.

[Jeffhs]

I am amazed your TV's CRT is still as strong as your tester says it is. I saw the date code on the tube, January 1976, so that CRT is probably a replacement. However, I would not expect a 39-year-old CRT to test good on all three guns, unless the TV was used very, very little or else it has been rejuvenated once.

BTW, particleboard cabinets were replacing real wood ones by the mid-'70s, although the trend may have started some time earlier. The stand (actually a modified utility cart) my home entertainment system is on is made of particleboard with some sort of fake woodgrain covering. That doesn't surprise me, as I bought the stand in the mid-'80s; by then just about everything was being constructed of this cheap material, a trend that continues to this day. My desk is made of the same stuff, and it is showing its age (I got it in the early 1990s).

[Electronic M]

One option is to set it in the driveway and hose it down with the garden hose, and maybe a paint brush and some soap for the PCB. I've hosed down a set before and had it go well. The key is to let it dry thoroughly. Here in the Wisconsin coolness it means waiting like three days to a week, but in the scorching Florida sun (I used to live there so I know) I'd reckon that if you give it 3 hours of even sun exposure on the top of the chassis, flip it and do the same for the bottom, and repeat until thorough inspection finds no moisture it will be fine. Word to the wise before you soak it get pictures of any and all paper labels on the chassis.

[Phil Nelson]

You can also put rubbing alcohol (isopropyl alcohol) in a spray bottle and use a paint brush or toothbrush to loosen the dirt. Turn the chassis on its side and work from the top down.

Phil Nelson

[Jeffhs]

I would be extremely careful around those PC boards, as they get brittle with age. I had a Silvertone (RCA CTC12 clone) roundie color TV in the early '70s that worked fairly well, until I tried to replace a tube on the video output panel. The tube socket broke out of the board, ruining the set (I was in no position at the time to repair the board). I've been wary of PC boards ever since.