CRT TVs

[momaka]

Re: CRT TVs

any tv from the 70's on has a shutdown feature if the hv exceeds a preset value.
even old sets the xray thing was overblown.hv rectifiers and shunt regulators were the source but they were in steel cages.

Ha, good to know. I guess things were just made better back then. I think it was precisely because of all of those X-ray safety stuff that CRTs were just better built. That, and the fact that there was plenty of space inside for components to be properly cooled.

By the way, I found some pictures of our 27" Philips 27RF50 CRT TV right before I gave it out on Craigslist.

[kc8adu]

Re: CRT TVs

any tv from the 70's on has a shutdown feature if the hv exceeds a preset value.
even old sets the xray thing was overblown.hv rectifiers and shunt regulators were the source but they were in steel cages.

[ahendricks18]

Re: CRT TVs

I have a cheap RCA from 1998 that I use for all my old games and computers (C64, sometimes my Tandy 1000EX). They don't hurt my eyes at all. I just don't use it for new consoles. Which I don't have many, so there you go.

[rievax_60]

Re: CRT TVs

I have seen many non-original EHT transformers cause higher EHT voltages. I used to correct it by reducing the HT voltage or increasing the flyback tuning capacitance.

[stj]

Re: CRT TVs

tuned? anode voltage too high you mean.

[eccerr0r]

Re: CRT TVs

If you have your CRT tuned wrong, nevermind UV from LCDs, you get X rays from CRTs...

[Andrew F. Ali]

Re: CRT TVs

I recently replaced a Flyback transformer on a SHARP 20" CTV Model No. 20C69Z Original FB# F-1139CE. Replaced with a F-1382CE....Working great!!!

[Agent24]

Re: CRT TVs

In terms of speakers, you can't fit anything good into a paper-thin modern LCD TV...
Arguably that goes for the rest of the parts, too!

[momaka]

Re: CRT TVs

...A KV-30HS420... will only run at 30Hz @ anything higher than 1280x720 using HDMI.

Probably because 720p is the highest the TV can handle in progressive scan. Anything above that likely goes into interlaced mode. Hence the 1080i specs.

Or perhaps the early version of HDMI has something to do with all of that too. IIRC, the HDMI version used in this TV lacks HDCP, so some sources may refuse to play on it altogether (or play at a lower quality/framerate like you noticed).

That said, 1920x1080 @ 30 Hz is still quite acceptable. When it comes to games, though, I prefer higher refresh rate/higher FPS over higher resolution.

Another thing about old CRT TVs over LCD is the built in speakers. This thing has a 15W speaker on each side. I know it's probably a size limitation, but the built in speakers on this thing sound better than the built in speakers of any LCD/LED TV I've heard.

Yup, CRT TV's have more space, so they often have bigger and better speakers in them compared to LCD. But Sony CRT TVs in general (epsecially latter models like yours) are known for using very nice speakers. I have two sets of 10W, 8-Ohm speakers pulled from those broken/dumped Sony CRT TVs I found. All I have to say is that they are very nice speakers. Also, the Sony KV-36FV310 that I found has a TFA9984j amp IC in it. From my research online, that IC is likely similar to the TFA9843j, which can do up to 40W per channel in BTL mode! The other Sony TV I found had a TDA8580j amp IC, which is capable of 23W per channel in BTL mode. So it's not just the speakers in these Sony TVs that are good. The speaker amp ICs they use are nice too.

[kc8adu]

Re: CRT TVs

speaking of crt tv i am going to indy to pick up a sony chromatron set.a kv-7010u.
very rare set!a friend spotted it at a yardsale for $15.
might be rarer than my rca ct100!

[RJARRRPCGP]

Re: CRT TVs

It doesn't get much use these days since we don't go to that house too often. Maybe for 2-3 weeks in a year.

It likely means a mouse is going to shit or piss! O_O Eww.
I hate that now, with American hantavirus out there..........

[Agent24]

Re: CRT TVs

that's not true, a modern lopt does not use a diode/cap ladder - it uses high-ratio windings to get the voltage and is potted to prevent arcing.
(not that it was very effective for philips or eldor transformers!)

Really? I thought they did. Maybe the older ones do. I'm sure I read it somewhere.

[stj]

Re: CRT TVs

that's not true, a modern lopt does not use a diode/cap ladder - it uses high-ratio windings to get the voltage and is potted to prevent arcing.
(not that it was very effective for philips or eldor transformers!)

[Agent24]

Re: CRT TVs

tripplers are evil, i'm glad they got replaced by line-output transformers!

They didn't. The tripler is just a voltage multiplier, the LOPT drives the tripler.
In modern sets the LOPT and tripler are integrated into the same unit along with the focus and screen controls. The overall circuit is still the same.

[stj]

Re: CRT TVs

only from a distance!

someone came to me wih a portable tv once that had a bad trippler, it was throwing sparks out of the lead all over the place - it looked like something from tesla!!!

tripplers are evil, i'm glad they got replaced by line-output transformers!

[sariwati392]

Re: CRT TVs

how can any engineer not like something that has an anode cap with a BIG red wire on it!

that would amazing to see the spark jump out of the red anode LOL

[Agent24]

Re: CRT TVs

I thought I was the only one Such a cool sound.

Such a joyful sound!

How do you discharge these without hurting yourself? Doesn't the tube operate at something ridiculous like 20kV?

Disconnect power, and put the plug in your pocket so nobody plugs it back in while you're not looking.

Then, take a long flathead screwdriver with a plastic handle and a clip-lead. Clip one end to the screwdriver shaft and the other to the CRT grounding braid. Hold one hand behind your back and use the other to stick the screwdriver head under the anode cap and look for the snap and spark. It's scary the first time but you get used to it.

If the TV has been off for a while, you would probably not see\hear anything as they often self-discharge to low levels anyway.
If you remove the anode connector, you should connect the clip lead between the CRT anode terminal and CRT ground to prevent the tube charging itself back up from dielectric absorption and giving you a shock when you plug the EHT lead back in.

Get a HV probe and check the voltage after discharging if you're paranoid.

[Pentium4]

Re: CRT TVs

Indeed. I just beat The Library on Legendary. Phew

[RJARRRPCGP]

Re: CRT TVs

I thought I was the only one Such a cool sound.


How do you discharge these without hurting yourself? Doesn't the tube operate at something ridiculous like 20kV?


I don't notice any flicker at 60Hz, but any lower than that it is very noticeable.


Yes it would be a shame for any of them to be thrown away. The only reason people don't like them is because of the size.....
My neighbors have a KD-36XS955 that they will want to get rid of soon. I told them I would gladly take it. In my opinion it's a perfect CRT TV. It's high def with HDMI, the only 4:3 to use Super Fine Pitch and 36" is a pretty big screen.


Yeah, the thing is pretty awesome for only being 480p. I gave it to my friend so that he could use it for his 360. The 360 looks A LOT better on that thing than his 32" 2009 Samsung LCD. He also only has SD cable, and it looks at least twice as good on the Trinitron.
I hooked the KV-27FS120 up to my Kill-a-watt meter and the thing was surprisingly efficient from what I originally judged by the power rating on the back. Just sitting at a "Video 2" with nothing hooked up, it was pulling 69W AC. Then I hooked it up to my computer via S-video and played a 480p video through it. With all the Brightness/Contrast/Color/Sharpness settings set to half way, the thing averaged around 85W AC. Went in the low 70's during dark scenes, and the highest I ever saw at a very bright scene was 114W which makes this thing more power efficient than my 39" Funai LCD.

The reason I decided to give this to him (besides being nice) is because I scored this thing instead! A KV-30HS420! Now, I got the true taste of a Sony Trinitron. 720p looks amazing on this thing, specifically cartoons such as Archer. The colors are so bright and defined. But, for whatever reason, it will only run at 30Hz @ anything higher than 1280x720 using HDMI. Since I'm only going to be using it for videos while hooked up to my computer, I prefer 1920x1080 @ 30Hz over 1280x720 @ 60Hz.

Another thing about old CRT TVs over LCD is the built in speakers. This thing has a 15W speaker on each side. I know it's probably a size limitation, but the built in speakers on this thing sound better than the built in speakers of any LCD/LED TV I've heard.

Looks like Halo! Cool!

[Pentium4]

Re: CRT TVs

The thing I like the best is the high voltage static noise when the CRT is turned ON or OFF.

I thought I was the only one Such a cool sound.

Just need to be careful and make sure the main cap is discharged and that you also discharge the tube anode, should you need to do remove the anode cap.

How do you discharge these without hurting yourself? Doesn't the tube operate at something ridiculous like 20kV?

The only downside of CRTs is flicker, which tends to give people headaches. But that only goes for TVs, since they refresh at 50/60 Hz.

I don't notice any flicker at 60Hz, but any lower than that it is very noticeable.

I usually see at least 2-3 postings a day.
Moreover, in the last 2 years or so, those postings were mostly for 30"+ size CRT TVs. Saw a few widescreen CRTs as well, but luckily they got snatched up. Would be a shame to see those go in the trash. Also saw a few 40"-42" Sony CRTs as well and really thought about taking one. But I just don't have the space... nor the manpower. Those 40"+ sets are a real back-buster.

Yes it would be a shame for any of them to be thrown away. The only reason people don't like them is because of the size.....
My neighbors have a KD-36XS955 that they will want to get rid of soon. I told them I would gladly take it. In my opinion it's a perfect CRT TV. It's high def with HDMI, the only 4:3 to use Super Fine Pitch and 36" is a pretty big screen.

KV-27FS120? Cool

Yeah, the thing is pretty awesome for only being 480p. I gave it to my friend so that he could use it for his 360. The 360 looks A LOT better on that thing than his 32" 2009 Samsung LCD. He also only has SD cable, and it looks at least twice as good on the Trinitron.
I hooked the KV-27FS120 up to my Kill-a-watt meter and the thing was surprisingly efficient from what I originally judged by the power rating on the back. Just sitting at a "Video 2" with nothing hooked up, it was pulling 69W AC. Then I hooked it up to my computer via S-video and played a 480p video through it. With all the Brightness/Contrast/Color/Sharpness settings set to half way, the thing averaged around 85W AC. Went in the low 70's during dark scenes, and the highest I ever saw at a very bright scene was 114W which makes this thing more power efficient than my 39" Funai LCD.

The reason I decided to give this to him (besides being nice) is because I scored this thing instead! A KV-30HS420! Now, I got the true taste of a Sony Trinitron. 720p looks amazing on this thing, specifically cartoons such as Archer. The colors are so bright and defined. But, for whatever reason, it will only run at 30Hz @ anything higher than 1280x720 using HDMI. Since I'm only going to be using it for videos while hooked up to my computer, I prefer 1920x1080 @ 30Hz over 1280x720 @ 60Hz.

Another thing about old CRT TVs over LCD is the built in speakers. This thing has a 15W speaker on each side. I know it's probably a size limitation, but the built in speakers on this thing sound better than the built in speakers of any LCD/LED TV I've heard.