Friday, January 25, 2019

Just scored for FREE the "best" consumer CRT tv ever made in the US?! JVC D-series 27 inch: Flyback death?

schrodingers_jew
1 point · 8 months ago
D-series is the best consumer CRT model ever sold in the US. Component/s-video+curved tube+700 TVL tube. Great find.
https://www.reddit.com/r/crtgaming/comments/8kotlh/is_this_a_good_jvc_crt/

So those are the CRT gaming nerds. I know nothing about this. All I know is I really had fun charging the Chafon while watching E.T. - way up close in vivid bright color. Actually I only had the DVD hooked up to the Chafon.

The tv takes I think 1.8 amps while I currently charge a trickle charge closer to 1 amp.

 I got sent the WRONG DC/DC Buck Converter from....


Lexington Kentucky! My commune co-op "super friend" lives there - so I have been there several times way back in the day. All I know is Amazon workers are literally slaves. So I feel bad about having to re-order the same item! I hope I get the "right one" - but first I'll wait for my return to get reimbursed.

In the mean time - I'll be burning fat while charging the Chafon and enjoying the amazing "popping colors." More reviews from the CRT gaming nerds:

 I have a 27” model and it is the best consumer set I own.
level 1
SirPanics
Muh Flatron
1 point · 11 months ago
The D-Series from JVC are right up there with XBR TVs from what I hear. Basically the best consumer shadow mask sets.
Wow this TV is such a relief compared to the last one - which was only 13 inches - this is TWICE as big - and the last one had bad audio. This has STEREO "surround" sound!!

  the D-series does have a curved screen and will give you more of an authentic CRT experience
 quite the irony - an "authentic" TV experience?
On the plus side, these have a softer look that many feel more closely resembles an old arcade machine
See the JVC in action - D-series - on some gaming geek channel "retro tech"

 This JVC D-Series unit not only looks great, but working like it did one once day 1 when it was out of the box Steve. Very nice colors and excellent sound on this once.
  The JVC blows the Sony out of the water. I found this video after I saw the JVC on craigslist. I went ahead and picked it up because of this video.
  I loved JVC and found that the color was always superior to the Trinitron.
I have no idea what all these "tv" terms are - and comparing the models? No IDEA! But still glad I SCORED an amazing free tv!!!
 This JVC is the perfect beast imo but I haven't had much luck finding one.
 Like I said - I did search this when I saw it posted on Craig's List - and as soon as I saw it as a "Retro" CRT hot item - I didn't think I had a chance!! I figure someone must have SNATCHED it up already! I went to return my Buck Converter - got home - was doing some research online and WHAM. Got the return email from Craig's List. Replied I was "on my way" and in an hour and half I had the tv back. It was a bit crazy carrying this thing.

(i.e. better parts used by JVC). Looking at the features at the JVC site, the D series set has better speakers and comes with the BBE enhanced audio feature. In addition it has 2 Svideo inputs whereas the 260 has one. The D series set weighs about 35 pounds more...some people equate weight with quality in tvs And the 800 lines of horizontal resolution means JVC is claiming that the D series will resolve 100 more pixels per scan line on the screen. Claims of horizontal resolution by manufacturers are hard to distill down to real practical facts, but one can probably guess from this that the D series has something that is a little better.
Yeah well - it was not light.

Here is someone from my AREA - who found the JVC D-Series on Craig's List - but had to drive 2 hours to try to get it - but could not get it.
I found one on Craigslist that's 2 hrs from me so I'll see if I can get it.

that's a long drive. hope it works okay.

Same here. This crt is literally my holy grail.
Yeah I had less than an hour drive - more like 35 minute drive one way.
 BTW, The main difference between the D-Series and the regular JVC sets are the component inputs. If your DVD player has a component output, as most do now, these make for exceptional clarity and color reproduction.
 Exactly. I was really impressed with the image on this screen. I was really a treat to enjoy all the vivid colors. I used RCA composite so I can UPGRADE the cables for even better quality.
Both composite and s-video support only interlaced, standard-definition video, now generally referred to as 480i. Progressive scan, and higher resolutions, are not available on composite or s-video connections.
 These are Y (Luminance again, along with the sync pulses), Pb (Blue minus Luminance), and Pr (Red minus Luminance). Color rendering is a step better than s-video, but what's more significant is that Y/Pb/Pr component video will also support higher resolutions and progressive scan, so if your video is running at 480p, 720p, 1080i, 1080p, (or, for that matter, any other oddball resolution which your source and display devices both support), you can make use of the full capabilities of your equipment.
 OK so what's those cables look like?
Yeah you have to special order them. There must be some LOCAL shop that has them. I'll call around tomorrow. Retro Reviews - this TV NEW 20 years ago was quite expensive - several hundred dollars

Based on the infomation I received from this site and after comparing to different models from Toshiba: 27AF41, 27AF61, 32AF41, 32AF61, Philips: 27RF50S, 32PT81S, Sony: KV27FS13, KV27FV17, KV32FS13, KV32FV27 --the JVC AV27F802 and AV32F802 are the best buys. JVC also has better warranty than Sony 1 year versus 3 months.
I bought the AV27F802 3 months ago for my mother in-law as a gift at Sears at the internet matched price of $649.99. Both my mom and dad in-law like the TV. Then recently my Dad in-law 's 6 years old 32" Sony TV gave up on him; he decided to buy AV32F802 for the replacement because he like quality of the model AV27F802. My dad in-law paid for his at an incredible internet matched price at Sears of $835.00. I could not believe they discounted that much! That is $264 off from the regular price and $364 lower than the comparable Sony model KV32FV27.
Personally, I think the picture on AV27F802 is just a little bit better than on the AV32F802 because the picture seems to be a litte bit more focus on smaller screen. The colors on both JVC AV27F802 and AV32F802 are more natural than on competive models. Both models are winners and highly recommended...
JVC's BBE surround feature provides decent faux-surround, and I mute the tv when I watch most programs anyway. The array of inputs the JVC offers is also fabulous,
 Great TV, but expensive for a 27 incher
 Really? I got mine for FREE!!!!
Component DVD must be seen on this set. Truly awesome.
 OK That convinces me - I HAVE to get "component" cables!! I'm excited. OK NOW I get the "secret" of the retro look!!
component video a.k.a RGB cable (green blue red).
When it come to built-in sound, JVC leads the pack.
 So best sound, best image for a CRT?
Sounded poor unless I turned on the BBE enhancement. This made the sound acceptable but then I got a buzzing out of the speakers at moderate listening levels.
 This set is expensive for a 27" model, for the price I think the sound should definatly be better. The picture is really kind of subjective & may appeal to some.
 Actually it really wasn't very expensive......!!!!! F-R-E-E.

It also has an awesome DVD/Component video picture. DVD movies have a crisp, film like quality that normal TV's do not have.
Strength: everything
Weakness: heavy, remote could be better (number keys too small)
This got to be the best TV in this price class, period. Compared the Sony and Pansonic TVs I've owned, this set produces by far the most natural colors.
Yep - it's heavy.
  However, I find the color to be much better with the JVC, this is especially true with contrasting color. If you look at the Black and White color on the JVC, you can see this is almost exact. For Sony, the White always have a tinge of pink color to it. For other picture, the JVC provides a more correct color.
  found out that this JVC is practically the best 27" TV that you can possibly get for the money.
 That review claims it weights 100 pounds!! I doubt that.
The JVC has 3 different viewing options for your pleasure. The Theatre, which darkens the picture a little bit, the Standard, which In my opinion looks the best, and the Choice, which is the one where you set the colors. The Standard one seems to make the picture more "real" and colorful. It adds more blue while the others add more green.
Yeah those are JVC FLAT CRT screens - not the D-Series (curved round screens)...

JVC 27 inch showdown - wow 78 pounds? I am surprised I carried that much up stairs and down stairs and across a snowy parking lot...

So that's another Retro Gaming review - comparing the JVC to the infamous Sony Trinitron...

Yeah he says he would not BUY this tv but you can get it for FREE on Craig's List. Exactly. Amazing that it sold for hundreds of dollars when it was new.
 My JVC is the first tv I've seen that had a brightness (black level) setting that was almost perfect from factory preset.
 What's INSIDE the JVC CRT tv? vid

So the Flyback is dangerous - even unplugged! It can KILL you!!
 The flyback operates by storing energy on the “charge” portion of the cycle and delivers the stored energy to the load on the discharge cycle. In the case of a flyback, the transformer is often described as a coupled inductor. Due to the diode polarity, current only flows in the secondary side during discharge
 A charged electrostatic capacitor, left alone, can hold its charge for months or years. It needs a discharge device to neutralise the charge in reasonable time. Usually it should get discharged in minutes (ideally one minute in most common applications).
 The flyback converter is based on the buck-boost converter.
 Ah... https://www.quora.com/How-does-the-flyback-transformer-in-a-cathode-ray-tube-TV-monitor-or-oscilloscope-work

Transformers only work with AC. However the signals surreounding the flyback become DC.

In the old CRT television days the beam refreshed the screen 30 times per second, and the beam crossed the screen with a sawtooth drive 262 times during that refesh period. That resulted in a sawtooth wave of about 31.5 KHz. THis AC sawtooth was called the flyback because it scanned acreoos the screen from left to right for one scan line and then flew back to the left as quickly as possible.  THis was applied to the primary of the so called flyback transformer. the voltage generated was proportional to L x di/dt; di being large and dt was small gave a voltage kick of several hundred volts. Using the secondary winding the peak of the flyback voltage was mulitplied to around 25KV P-P and rectified for a 25" color TV. Larger tubes would need higher in voltage for the anode. The conductive anode of the tube was the capacitor filter (no current was required) and the anode of the tube would hold this voltage for a long time as many a TV tech learned.
 Back to JVC reviews:

So what BBE achieved was to get me back to the sound quality I had in the first place with my non-BBE enabled AMP. I don't really consider that an 'enhancement.' The real question for JVC is "why is this an ON/OFF option?" Who would turn BBE off? Presumably someone whose listening preference is inferior truncated sound.
 So turn on the BBE?

Are the Flybacks carcinogenic? The book Currents of Death investigates

I've read that book - as a quick speed read - back in the day... (late 90s)...

So the X-rays from the Cathode Ray Tube are absorbed by the phosphorus and so not considered a hazard. But the low frequency radio wave Hertz of the Flyback is another issue! It also has a strong 60 hertz pulse...
These components may produce x-rays capable of escaping from the television receiver or CRT.
Do CRT TVs emit radiation?
No, but their older counterparts, Cathode Ray Tube (CRT) monitors, do give off a small amount of radiation. The streams of electrons hitting the phosphor in the screen produce X-rays, but these are way below harmful levels. Coils in the monitor also emit some electromagnetic radiation.
And to protect you? Lead oxide glass screens

 Cathode ray tubes from old TVs or monitors can contain 4-8 pounds of lead.
http://www.electronicstakeback.com/2012/11/15/recyclers-stockpiling-millions-of-pounds-of-toxic-glass-from-crt-tvs-and-monitors/
Dr. Savitz mentioned 2 milliGauss as the level at which cancer is produced in children. In the home of these people, I have measured 10 to 12 milliGauss, ...
Missing: 9000 ‎| ‎Must include: ‎9000

The current recommended limit is 833 to 9,000 milligauss. ... purpose of this study was to verify or disprove a link between EMF and brain cancer or leukemia.
So the Flyback kicks out 9000 milligauss.... but at what distance? It's inverse square right?

gradient of 20 mT/cm...?

 So the EArth's DC field is 500 milligauss.... But it's the AC pulsing that makes the milligauss carcinogenic... (pdf)

I think riding the exercise bicycle can offset this pulsing...

OK so the AC pulsing DECREASES the melatonin output (the greatest antioxidant) thereby increasing the free radicals in the body...

Wow - fascinating. I knew about this stuff but now I know a bit more about electronics - so the info STICKS better...

Plus it ties into the quantum biology aspect.

OH wow - now I can test my OWN voltage using the digital multimeter I bought. 

I had not thought of doing that before....

But this was tried on John Chang and it didn't work - since they couldn't find the ground, etc.

So with the Earth as the ground - there should be ZERO volts.

So pulsed DC current is healing but AC pulsing causes damage - since the polarity is being reversed - I suppose....

Also LED screens cause cataracts and cancer....
 Eyes are not designed to look directly at light — they are designed to see with light,’ Sánchez-Ramos said.
Her comments are partly based on her 2012 study that was published in the journal Photochemistry and Photobiology. The study found that LED radiation caused significant damage to human retinal pigment epithelial cells in vitro. Sánchez-Ramos added that modern humans have their eyes open for roughly 6,000 hours a year, and are exposed to artificial light for the majority of that time. Some experts have called for the LED lights to have built-in filters to cut out the blue glare.

So watching a movie - absorbed in the visual detail - it is easy to lose track of time - which is a GOOD thing if you're riding a bicycle CHARGING the generator!!
Eventually more electrons don't want to come up on you because you're so charged up. You end up with a high voltage, about 20,000 to 25,000 volts." That's serious power at your fingertips, considering a normal electrical outlet on the wall is only around 100 volts of electricity.Apr 17, 2006
So normal "static" electricity is also radio frequency voltage but it has not CURRENT flowing - just the charge.

The secret of why CRT "pops" in color - DEPTH

 CRT has lower resolution but can very the width/height information MORE per pixel (or something like that) - as the ray is "bent" based on the horizontal and vertical coils...


I bought a nice 27" Sanyo CRT from a nearby yard sale a few weeks back because I love watching 4:3 content on an actual 4:3 screen.
4:3, also known as 1.33:1 or fullscreen
http://noamkroll.com/why-the-old-school-43-aspect-ratio-is-coming-back-with-a-vengeance-right-now/
Personally, I am (and always have been) a fan of 4:3. Maybe it’s because so many of my favorite films were old classics shot on 35mm or 16mm in 1.33, or maybe it’s the way in which the square-ish frame can inspire unique framing choices. Whatever the case, it’s always caught my attention – so much that I plan to shoot my next film in 1.33 as I think it will be the best choice for the story.
Movies are about people, not landscapes. And unlike epic landscapes (which call for a wide aspect ratio), people – or more specifically, faces – beg for 4:3. The reason is quite simple: A human head fills up more of the frame at 1.33 when compared to 2.35. A normal closeup at 2.35 is going to leave a lot of empty/negative space on the opposite side of the frame. This could of course be an excellent artistic choice for a specific project, but it won’t highlight the actor’s micro-expressions the same way a 4:3 frame will.
There’s something about 4:3 that helps us connect more intimately with the characters. It feels more naturalistic in a sense, and for character driven pieces it can offer an effective gateway for the audience to zero-in on the subtleties of the performances.
and back to CRT chauvanism!

 Other reasons why CRTs are the best - Better colour than most LCDs - Less input lag (instantly displays image) - A mid-ranged CRT has better speakers than any modern televisions (more bass (with exceptions with some newer TVs) - No such things as dead pixels on a CRT - Great viewing angle - LCDs are not able to display a true black colour. CRTs can! - And of course, CRTs are cheaper

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