Toshiba "Family Vision" 10PK Japanese 10" portable restoration

[cj_reha]

I think I have a problem, folks...I can't stop buying adorable little tube-type Japanese TVs!



Seriously though, I've been looking for one of these metal-cabinet 10" Toshibas for a handful of years now, but for one reason or another kept missing out until now. There are a handful of different models I've seen (10PG, 10PK, etc.), some with "Family Vision" branding, some plain, and a whole slew of cabinet colors, but they all seem to use a very similar - if not identical - chassis. My service data book only has a schematic for a 10PG, but so far it's matched this set in most circuits I've studied. So let's dig in!



This particular example is complete, but grimy as hell, and clearly has a billion hours on it. The horizontal output tube, although an original Toshiba part, has almost no getter left!



Perhaps unsurprisingly, the 250CB4 CRT tested pretty poorly at first. It came back into the green after a restore cycle on my Sencore CR70, but I don't really put a lot of faith in rejuvenation as a concept...we'll have to resurrect the set and watch it for a while to see if that lasts. Maybe it'll produce a good picture, who knows?



This is a series-string set with a solid state B+ rectifier. Before powering it up, I wanted to get the chassis out of the cabinet to reform the electrolytics. This set uses quite a few in the power supply - a 200uF cap in the doubler, and four (!) 100uF caps in the pi filter for the +220/210V supplies. I've had pretty good luck with 1960s Japanese can electrolytics, and it's easy to reform them in this particular power supply configuration, so I always try to save them if I can. But before I was able to do that, a mystery polystyrene capacitor fell out of the case into my hand while taking it apart



After about an hour of looking, I determined it to be C179 - a small 100pF cap on the plate supply to the 6BN8 sound detector/preamp. Phew! Easy enough to replace; I found a 500V silver mica in the stash that will work fine. I hope this is the only part gone AWOL



The mechanical engineering of the set is excellent. All connections to the CRT have removable plugs, so it is very easily removed without bothering the yoke, a requirement on a lot of contemporary American sets. There is a B+ interlock on the yoke socket, but that's easily bypassed for reforming purposes.