 SparkChaser
Premium Member
join:2000-06-06
Downingtown, PA
3 edits |
to Tekie
Re: Old CRT toshiba flat screensaid by Tekie:Ok to clear this up the "Beam Deflectors" were Deflection Yokes, basically an electromagnet mounted on the funnel (neck) of the tube and that controlled the movement of the beam as it swept across the face of the CRT.
"Control gates" they were control grids and were analogous to the base on a bipolar transistor or gate on an FET. There were two types of deflection. You are correct the yoke was used in the later tv's. There is however CRT with beam deflector plates used in smaller CRT. e.g scope. 
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to frank92
said by frank92:For 60$ i can have flat small LCD with ATSC converter inside ? $80 brand new... 19" at Walmart |
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to frank92
said by frank92:CRT 10$ but i bought analog to ATSC converter for 50$
For 60$ i can have flat small LCD with ATSC converter inside ? at a yard sale or flea market or pawn shop, absolutely.. |
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 EliteDataEliteData
Premium Member
join:2003-07-06
Hampton Bays, NY
1 edit |
to frank92
this Hitachi 51" inch rear projection TV is three CRT's, red, green and blue, there is no "lamp" as this is not a LCD/DLP rear projection TV that would have one.
best advice is to stay away from CRT rear projection TV's, especially if they are older than five years from the date of manufacture. |
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| EliteData |
to radios1
said by radios1:that unit has HDMI input for 1080I, but, it has 3 small CRT's. red, green, and blue, facing the back of the set, a mirror is used to reflect the image to the screen on the front. if you don't get a white screen on that, forget it.. green is the last tube standing, since it don't have to go anywhere near it's maximum output to give a proper white screen in normal operation. CRT replacements have not been made for many years, you can't buy them anymore.. I see these thrown out regularly, as they can't be repaired, unless you manage to get the CRT's you need by searching through many found Junkers.. replacement CRT's for rear projection TV's are still available and they are very expensive but it is no longer cost effective for the consumer considering the low cost of new LCD TV of comparable screen size of which uses much less real estate, power and weighs much less. |
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| EliteData |
to leibold
said by leibold:said by Mark12547:I do have memories of replacing tubes in a couple of CRT TVs, but not the CRT itself. I have helped to replace CRTs but more often we would repair (if possible) the picture tube without removing it from the TV chassis (degaussing, clearing gate shorts, ...). Even back when CRTs were the only option, it often was not cost-effective to replace the picture tube. I don't think we ever did it unless it was a warranty case. the "Loewe" flat screen HD CRT TV was the "cream of the crop" back in the day for wealthy consumers paying up to $1500+ for one 30 inch model but the CRT in these models were manufactured so poorly that they would often fail within the first 4 months of ownership. i can remember as a sub-contractor hired to repair these models, how "shitty" they were, a Sony 32 inch SD CRT TV was much better than these garbage TV's. |
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to cowboyro
He paid $50 for the converter? The US was literally giving those away for a few years. I'm surprised you couldn't find a used on on eBay for $5.
The 19" LCD is going to use half the power. Probably only $2 a year, guessing a couple hours of TV a day and maybe 10c/kwh. |
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I have one of those subsidized converters. I no longer remember what was the after rebate price -- could've been $5 .. $15. However, not all converters were eligible for a rebate: there were some restrictions on the output, and if they had anything better than S-video (component or HDMI if I remember right) the rebate did not apply.
So depending on the converter it may make sense to pay more; if, for example, it has better outputs. I have several high res monitors (up to 4k 40" with VGA/DVI/HDMI/DP) that could make a reasonable TV, and one 17" Tatung LCD TV/monitor (VGA, component, S-video, composite, RF) that I don't use any more, but keep it for its inputs, so I can use it to watch TV with mo converter, or use it with my (inherited) Beta and VHS video players if I want to. |
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TheMG
Premium Member
join:2007-09-04
Canada MikroTik RB450G
Cisco DPC3008
Cisco SPA112
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to frank92
There's so many LCD TVs available second hand for dirt dirt cheap I don't know why anyone would even consider a CRT TV anymore, unless you're into playing retro video game consoles which sometimes work best with a CRT, or the CRT TV in question is one of the rare high-definition models.
ATSC television broadcast is very high quality, you'll be missing out on a lot of the detail on an old analog NTSC CRT.
Not to mention the extra power consumption, heat, size, and weight (and for those of us who can hear it, that extremely irritating 16kHz whine). |
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EliteDataEliteData
Premium Member
join:2003-07-06
Hampton Bays, NY |
agreed, certain older console game consoles like the PS1 certainly do appear better on a CRT than an LCD |
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 TekieNeeds More Coffee
join:2008-01-03
Colonial Heights, VA |
to SparkChaser
said by SparkChaser:There were two types of deflection. You are correct the yoke was used in the later tv's. There is however CRT with beam deflector plates used in smaller CRT. e.g scope. Thanks I'd forgotten about those tubes using deflection plates. Interesting ad, I wasn't aware that they'd ever been used in televisions. Would be interesting to look at the specs on that Dumont tube but there's no website address in the ad.  |
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 shdesignsPowered By Infinite Improbabilty Drive
Premium Member
join:2000-12-01
Stone Mountain, GA
ARRIS SB6121
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shdesigns
Premium Member
2017-Nov-18 11:02 pm
said by Tekie:Interesting ad, I wasn't aware that they'd ever been used in televisions. Motorola, RCA and admiral did several. Back when TV's were 7 or 8" in size, they used electrostatic deflection. Check out bandersentv on Youtube, he has restored several electrostatic sets. Ad for the original topic, I see smal LCD TVs free on craigs list often. |
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to TheMG
said by TheMG:There's so many LCD TVs available second hand for dirt dirt cheap I don't know why anyone would even consider a CRT TV anymore, unless you're into playing retro video game consoles which sometimes work best with a CRT, or the CRT TV in question is one of the rare high-definition models.
ATSC television broadcast is very high quality, you'll be missing out on a lot of the detail on an old analog NTSC CRT.
Not to mention the extra power consumption, heat, size, and weight (and for those of us who can hear it, that extremely irritating 16kHz whine). those are great for SD programs. operating an LCD TV below it's native resolution gives you artifacts. |
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| radios1 |
to shdesigns
said by shdesigns:said by Tekie:Interesting ad, I wasn't aware that they'd ever been used in televisions. Motorola, RCA and admiral did several. Back when TV's were 7 or 8" in size, they used electrostatic deflection. Check out bandersentv on Youtube, he has restored several electrostatic sets. Ad for the original topic, I see smal LCD TVs free on craigs list often. much larger, and electrostatic deflection becomes unwieldy, as you have to make the tube much longer to deflect the beam, deflection yokes handled that problem much easier. |
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 broknsymetryFutue Te Ipsum
Premium Member
join:2003-06-27
THE VOID
1 edit |
to aurgathor
said by aurgathor:said by leibold: it often was not cost-effective to replace the picture tube. I don't think we ever did it unless it was a warranty case. In my neck of the wood, replacement CRTs were very reasonably priced compared to new TVs, so replacements were not uncommon, although dim CRTs were normally fixed with a couple of extra turns of wire. (which worked fine for a little while, but at the end it hastened the demise of the CRT) In any case, a CRT replacement is an experience I'll never forget....  learned on the 1st one that shorting the CRT to the ground with a screw driver is not enough to discharge it.  Replacements were fairly cheap if you used a sub (OEM were $$$) and you could often sell back the old jugs for refurbishing. I did a lot of replacements in the early 90s, 25"-40" and projection. I got real good at lifting them out by the neck (not the 40, too heavy) and never cracked a single one (did have a set fall of the workbench though, got ill when I heard the hissing.) Of the projection sets I hated the Philips sets the most because you had to empty and refill the coolant/optical coupling liquid and they were a bitch to set convergence afterwards. The Mitsubishis were my favorite — the optical assembly came pre-mounted, the crts were easily accessible and convergence was a snap with the controls in front of the set so you didn't have to use a mirror. I rarely rejuvenated because it was too unreliable and I didn't want an angry customer; I could usually sell them on a sub. I also never got bit by one that had not discharged; most were self discharging but I would still ground them out. |
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EliteDataEliteData
Premium Member
join:2003-07-06
Hampton Bays, NY |
EliteData
Premium Member
2017-Nov-19 12:46 pm
said by broknsymetry:said by aurgathor:said by leibold: it often was not cost-effective to replace the picture tube. I don't think we ever did it unless it was a warranty case. In my neck of the wood, replacement CRTs were very reasonably priced compared to new TVs, so replacements were not uncommon, although dim CRTs were normally fixed with a couple of extra turns of wire. (which worked fine for a little while, but at the end it hastened the demise of the CRT) In any case, a CRT replacement is an experience I'll never forget.... learned on the 1st one that shorting the CRT to the ground with a screw driver is not enough to discharge it. Replacements were fairly cheap if you used a sub (OEM were $$$) and you could often sell back the old jugs for refurbishing. I did a lot of replacements in the early 90s, 25"-40" and projection. I got real good at lifting them out by the neck (not the 40, too heavy) and never cracked a single one (did have a set fall of the workbench though, got ill when I heard the hissing.) Of the projection sets I hated the Philips sets the most because you had to empty and refill the coolant/optical coupling liquid and they were a bitch to set convergence afterwards. The Mitsubishis were my favorite — the optical assembly came pre-mounted, the crts were easily accessible and convergence was a snap with the controls in front of the set so you didn't have to use a mirror. I rarely rejuvenated because it was too unreliable and I didn't want an angry customer; I could usually sell them on a sub. I also never got bit by one that had not discharged; most were self discharging but I would still ground them out. newer mits RPTV CRT were often subject of leaking coolant and often destroyed the deflection PCB under it. oh i hated the philips/mag RPTV CRT, the coolant/optical liquid always got cloudy and it was generally always the blue CRT first. not only did you have to drain the liquid but you had to remove the lens to clean the inside of the CRT and lens from the gunk left by the garbage liquid. all RPTV CRT's, i removed the "light box" and brought back to the shop for servicing, anyone who removes the entire cabinet with the "light box", doesnt know what they were doing. often times, the mits with blown convergence amps were easy to repair, the module could be removed and taken back to the shop for repair instead of the entire "light box", touch up convergence using the remote was often quick and easy. the worst RPTV CRT of the bunch was the hitachi with its "auto-convergence", what a nightmare that set is. |
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to broknsymetry
said by broknsymetry:Replacements were fairly cheap if you used a sub (OEM were $$$) I was behind the 'iron curtain' until 1984, and prices were different there. Set specific repair parts were normally very hard to get if you weren't a state sanctioned enterprise, but they were always OEM (since there were only a very small number of makers, usually only 1 or 2 per country) and not outrageously expensive, but one had to know the right people or have the connections to obtain them. I know for certain that I replaced at least two CRTs -- first in a friend's TV, and then in my own much later, but there may have been a few more I can no longer remember. Electronics was my hobby, and TV repair was a good practice for that back then. I also never got bit by one that had not discharged; most were self discharging but I would still ground them out. I'm not sure if the TVs I worked on had bleeding resistors or not (probably yes on newer sets), but I knew pretty damn well that the CRTs need to be discharged, I just didn't know that they had to be kept grounded for a relatively long time. Oh well, live and learn.... |
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 frank92
join:2014-09-04
Trois-Rivieres, QC |
Is old school
With my converter ATSC colors is very ugly
I put setting 480i 4:3 but atsc signal is 16:9 1080p ?
On CRT resolution is bad not full screen for subtitles |
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| frank92 |
I saw a guy open a CRT television on the street worth pieces ?? $$$$ |
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With a few exceptions, CRT TVs worth very little or nothing, or even have a negative value.
The two exceptions I can think of are antique TVs or HD TVs, though there could be others. |
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 DrStrangeTechnically feasible
Premium Member
join:2001-07-23
Bristol, CT |
to SparkChaser
Somebody should tell them they typoed 'Passaic'. |
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SparkChaser
Premium Member
join:2000-06-06
Downingtown, PA |
Maybe that's how they spelled it in the 30's - 40's.  Just googled it and it's amazing how many misspellings there are. I never noticed it. |
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to frank92
CRTs have value only to those who make dump runs...
Even Salvation Army has stopped accepting them many years ago. |
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to aurgathor
said by aurgathor:With a few exceptions, CRT TVs worth very little or nothing, or even have a negative value.
The two exceptions I can think of are antique TVs or HD TVs, though there could be others. free electronic components!.. |
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SparkChaser
Premium Member
join:2000-06-06
Downingtown, PA |
to frank92
Years ago I went to this company in the UK » www.phosphor-technology. ··· osphors/ looking at phosphors. One of their phosphor products was CRT phosphors. I just looked at their website and they still make them. I guess there is a market somewhere. |
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 ·Consolidated Com..
 ·Hollis Hosting
 ·FirstLight Fiber
·Republic Wireless
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to radios1
said by radios1:free electronic components!.. We are getting pretty far off topic but back when I was growing up in the 50's/60's old TVs and WWII military surplus were my major source of components. /tom |
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frank92
join:2014-09-04
Trois-Rivieres, QC |
frank92
Member
2017-Nov-20 10:33 am
I put my AOC monitor is very amazing with the ATSC converter vs the CRT |
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to tschmidt
said by tschmidt:said by radios1:free electronic components!.. We are getting pretty far off topic but back when I was growing up in the 50's/60's old TVs and WWII military surplus were my major source of components. /tom not off topic, the OP owns this post. said by frank92:I bought this CRT for my room, I do not want to pay $ 250 for a small LCD. I know it's old, but just to watch OTA and DVD. I programmed a universal remote control and work.
Some high quality CRT Tv's like the Sony Trinitron, and professional CRT studio monitors will be collectable but all those old RCA's, Zeniths, and Sanyos won't be worth anything. The OP did ask if they are worth anything. being off topic usually implies trying to hijack an OP's thread, which is why it's usually not allowed, but the OP OWNS the thread, so, he should be able to ask seemingly unrelated questions about it. in this case, it's not off topic.. |
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broknsymetryFutue Te Ipsum
Premium Member
join:2003-06-27
THE VOID |
Ironically, discussing the definition of "off topic" is off topic, but then so is this post. |
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frank92
join:2014-09-04
Trois-Rivieres, QC |
frank92
Member
2017-Nov-22 12:23 pm
It is normal with CRT image is too large
Is not 4.3 |
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Just googled it and it's amazing how many misspellings there are. I never noticed it. 
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