Sony Trinitron KV-1201 score

[zenithfan1]

I had great results with my Sencore CR-70 "Beam Builder" tester. I used one cycle of the auto restore function and the CRT came back nicely. I hope you can restore yours too. Good luck with it, I like your set. Looks like a big version of my little one.

[sampson159]

when those sonys are right,they rule.sharp,sharp picture.definatetly a keeper.once again,you have topped us all.welcome back mark!

[freakaftr8]

Hey Mark! Where u been! Lol, yeah i've been busy too... Hey this lil kv-1220u has a better picture than my 13". If you look at early trinitrons, they really were strong about quality. the 13" has a blotchy shadow mask, you can tell it's warped or something. Iv'e seen like 5 of these newer trinitrons this way. Ill snap some photos, I just touched up greyscales and some convergence.

[Tomcomm]

Mark....Good to know the Sencor CT 70 works great on on our '70-'75 trinatrons. I can get a shop to test/repair my 21in 570DB22 for $45-65 or I can get a used CT 70 for around $150 inc shipping, on Ebay. I count 13 operational CRTs at my place, 4 are Sony trinitrons.....I'm tending to go with the Ebay. BTW, does your CT 70 test 570DB22 8 pin base?

[radiotvnut]

I think I'd go the used CR70 route. If you own several old TV's or plan on owning more old TV's in the future, the CR70 would pay for itself. It wouldn't take many trips to the TV shop to eat up what a used CR70 would cost. I believe the CR70 cost over a grand when it was new. I suspect there will be many quality CRT testers available for a very reasonable price in the near future since CRT's are being phased out.

[zenithfan1]

Originally Posted by Tomcomm

Mark....Good to know the Sencor CT 70 works great on on our '70-'75 trinatrons. I can get a shop to test/repair my 21in 570DB22 for $45-65 or I can get a used CT 70 for around $150 inc shipping, on Ebay. I count 13 operational CRTs at my place, 4 are Sony trinitrons.....I'm tending to go with the Ebay. BTW, does your CT 70 test 570DB22 8 pin base?

Yes, this thing can test ANY CRT made up to now if you use a schematic and universal adapter which I have, {up to '91 is in the tube book}. It also has the 8 pin adapter too. In my opinion, this is the best tester. It even has the 15GP22 listed in the tube chart!

[zenithfan1]

Originally Posted by radiotvnut

I think I'd go the used CR70 route. If you own several old TV's or plan on owning more old TV's in the future, the CR70 would pay for itself. It wouldn't take many trips to the TV shop to eat up what a used CR70 would cost. I believe the CR70 cost over a grand when it was new. I suspect there will be many quality CRT testers available for a very reasonable price in the near future since CRT's are being phased out.

Hey Bryan, I just took the time to read your post, you are right. It did cost about a grand when new. I too recommend anyone that needs a tester to get this one or a Beltron, those are the only ones I put full faith in. I bought mine from a retired tv repairman on ebay. I was the high bidder with the reserve not met, I emailed him and said I really needed it, he said he wanted it to go to good use and relisted it for me with a buy it now of 70 bucks, 5 bucks more than my highest bid but worth every penny. All in all it was under 100 bucks including shipping. I once tried to damage a dead CRT with it just to test out what I can and can't do with it, I didn't want to damage any round color tubes on accident or anything else rare for that matter. It turns out that it won't let it's self damage a CRT, it will shut down and stop restoring or rejuvenating, it keeps track of how much the tube will emit and then won't go any further. The tube I tried to ruin actually came back and still works! The one in my CTC-53 won't rejuvenate because of the lack of cathode material. One amazing tester I think.

[Kiwick]

I have the same set, mine is an European PAL KV1300, with a wooden cabinet, sadly mine has a zillion hours (the CRT is still useable though) and a badly messed up IF panel for which i can't find a schematic.

[dr.ido]

I had a version of the KV13xx as a child that I have never seen another one like it. It had the wooden cabinet and the patent avoiding PAL->NTSC circuit with tint control (so it was pre-1975 and likely a private import, Australian market sets didn't show up until 1975 and all had real PAL decoders). What made it unusual was it had an AV input. At the time even most new sets didn't have AV inputs. Below the "auto" switch on the front panel was an additional switch "TV/VTR". On the back was an 8 pin EIAJ connector (which also carried video out from the tuner). I'm sure this was from the factory and not an aftermarket modification as the recess for the connector was molded into the back panel, not cut after manufacture. It was probably originaly supplied with a Sony reel to reel VTR.

It developed a weird vertical foldover fault that was beyond me at the time so I took it to the local repair shop. They claimed that it needed special order parts and offered me some generic 14" set in exchange. I told them I'd wait. Months past and they went out of business taking my Sony with them. In hindsight I'm sure he repaired it and kept it for himself. Unlike most early Sonys even then (1990) it had a perfect CRT.

I'm not sure what the exact model number was, or where it orignally came from (I got it at a flea market. I've never seen another one like it and consider it one of my "holy grail" sets.

[AndrewM]

Kiwick, I have the schematic for the KV-1310E if thats of any use. I believe the IF strip is the much the same as the KV-1300 as a quick check shows the KV-1800AS and KV-1810E are very close.

[Kiwick]

I probably just need to know the value of a resistor and the type of a transistor as i have a dead IF panel with a crappy repair on it (it's got a resistor replaced with a trimpot and a transistor replaced with a random low frequency type)

I'll take it out of my actic ASAP...

[Kiwick]

Ok, i have the sony on my bench with its back off right now!

The transistor is Q209 and the replaced trimpot is VR201 (i though it replaced a resistor, i've last worked on this set about 4 years ago)

This set displays a really bad, blurry, unstable picture and the sound has loud intercarrier buzz, after a few minutes both picture and sound start to drift in and out then it finally ends up with a blank raster and no sound.

[AndrewM]

Little wonder you have reception issues as Q209 forms part of the RF AGC circuit for the VHF tuner. The correct part should be a 2SC677. The base of this transistor goes to VR201 wiper which is a 470 ohm trimpot to adjust VHF Tuner AGC level. The trimpot ends connect via R207 560 ohm to 18v IF panel supply and the other end goes to a centre tap on VIF transformer 2.

Voltages on the transistor should be:
Base 15v (11v with signal)
Collector 12v
Emitter 0v (4.9v with signal)

Hope this helps.

[Kiwick]

i've fitted a 2SC677 but it seems to make no difference, the picture and sound keeps drifting in and out as the set warms up

Time for a full recap on the IF panel, right?