Main Restorations Software Audio/Jukebox/MP3 Everything Else Buy/Sell/Trade
Project Announcements Monitor/Video GroovyMAME Merit/JVL Touchscreen Meet Up Retail Vendors
Driving & Racing Woodworking Software Support Forums Consoles Project Arcade Reviews
Automated Projects Artwork Frontend Support Forums Pinball Forum Discussion Old Boards
Raspberry Pi & Dev Board controls.dat Linux Miscellaneous Arcade Wiki Discussion Old Archives
Lightguns --- Bug Reports --- Site News

Unread posts | New Replies | Recent posts | Rules | Chatroom | Wiki | File Repository | RSS | Submit news

  

Author Topic: 21" tube to a 28" TV chassis?  (Read 494 times)

0 Members and 1 Guest are viewing this topic.

Paradise

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 60
  • Last login:February 13, 2019, 04:42:29 pm
21" tube to a 28" TV chassis?
« on: February 08, 2019, 05:47:06 am »
Is it possible to connect a 21" tube to a chassis that had a 28" tube if the neck board has the same pins?

Last month i bought a CRT Regenerator/Analyzer for $45:


In the adapter list i see that the 21", 25" and 28" tubes i have need the same adapter.

princess prin prin

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 136
  • Last login:March 09, 2019, 10:20:31 pm
  • intrinsically safe
Re: 21" tube to a 28" TV chassis?
« Reply #1 on: February 08, 2019, 08:24:26 am »
The CRT base type means nothing. You can have the same base on tubes starting from 14" through to 29" and bigger but that doesn't mean that a chassis made for a 14" CRT will work fine on a 28" CRT just because the neckboard fits both.

As a general rule you can divide CRTs in two basic groups depending on the deflection angle. 90 CRTs are 14" through to 21" (there are some 21" tubes that are 110 but they're an exception) and 110 CRTs are 25" and 28" (22" became obsolete in the 80s). 29" are 110 or some other angle close to that (e.g. 114). 100 were also made but long ago and mostly in the US, not in Europe. A chassis made for 90 tubes will not work with a 110 tube (EHT requirements are different, line output circuit is different, scan coils aka yokes are different, etc.) and vice versa. And even within the same group you'll often find that the same chassis may have slight differences if made for a 14" from one made for a 21" or for a CRT made by one manufacturer and another CRT of the same size made by another manufacturer. Without detailed information on chassis circuit variants try at least not to mix 90 with 110 CRTS/chassis.

Paradise

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 60
  • Last login:February 13, 2019, 04:42:29 pm
Re: 21" tube to a 28" TV chassis?
« Reply #2 on: February 08, 2019, 08:34:56 am »
To bad because all the 21" TVs i collected now that have the right chassis for MAME have Toshiba tubes with bad convergence.

And i just realized that the 25" and 28" tubes i have don't have convergence rings???
Looked at just one 25" (A59EAK071X01) TV yet and also bad convergence.

princess prin prin

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 136
  • Last login:March 09, 2019, 10:20:31 pm
  • intrinsically safe
Re: 21" tube to a 28" TV chassis?
« Reply #3 on: February 08, 2019, 09:07:59 am »
All your tubes have bad convergence? Aren't you a bit too demanding?

Philips tubes are unique in that they have a single internal ring that is located at the end of the electron gun assembly and is magnetized at factory with an external apparatus with all the necessary purity and static convergence corrections. Static convergence is the convergence in the central area of the screen. If there are any dynamic convergence issues (miscongvergence in corners/peripheral areas) these are not adjusted by rings but with yoke tilting and spoilers (aka convergence strips) although it should be noted that Philips NEVER used those strips but you can try them.

« Last Edit: February 08, 2019, 09:10:44 am by princess prin prin »

Paradise

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 60
  • Last login:February 13, 2019, 04:42:29 pm
Re: 21" tube to a 28" TV chassis?
« Reply #4 on: February 08, 2019, 10:02:28 am »
Maybe i'm to demanding. I don't know what is good, acceptable or bad.

21" Toshiba:

 

Paradroid

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 656
  • Last login:Today at 04:24:10 am
    • SCART Hunter
Re: 21" tube to a 28" TV chassis?
« Reply #5 on: February 08, 2019, 01:44:03 pm »
Maybe i'm to demanding.
Definitely too demanding. :)


Sent from my SM-G955F using Tapatalk

My MAME/SCART/CRT blog: SCART Hunter

Paradise

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 60
  • Last login:February 13, 2019, 04:42:29 pm
Re: 21" tube to a 28" TV chassis?
« Reply #6 on: February 09, 2019, 04:47:52 am »
If i look here at 6:30 the convergence seems to be perfect. And it's a 32" tube:


Playing with the rings i found out that the original position was always the best.
I also used a degaussing coil...
I made pictures from my tubes. You judge.

21" tube 1:
https://skulltronics.net/share/fixed/tv/toshiba_A51JAR43X01_1.1.jpg
https://skulltronics.net/share/fixed/tv/toshiba_A51JAR43X01_1.2.jpg
https://skulltronics.net/share/fixed/tv/toshiba_A51JAR43X01_1.3.jpg
https://skulltronics.net/share/fixed/tv/toshiba_A51JAR43X01_1.4.jpg
https://skulltronics.net/share/fixed/tv/toshiba_A51JAR43X01_1.5.jpg

21" tube 2:
https://skulltronics.net/share/fixed/tv/toshiba_A51KST40X01_1.1.jpg
https://skulltronics.net/share/fixed/tv/toshiba_A51KST40X01_1.2.jpg
https://skulltronics.net/share/fixed/tv/toshiba_A51KST40X01_1.3.jpg
https://skulltronics.net/share/fixed/tv/toshiba_A51KST40X01_1.4.jpg
https://skulltronics.net/share/fixed/tv/toshiba_A51KST40X01_1.5.jpg

25" tube 1:
https://skulltronics.net/share/fixed/tv/philips_A59EAK071X01_1.1.jpg
https://skulltronics.net/share/fixed/tv/philips_A59EAK071X01_1.1.jpg
https://skulltronics.net/share/fixed/tv/philips_A59EAK071X01_1.1.jpg
https://skulltronics.net/share/fixed/tv/philips_A59EAK071X01_1.1.jpg
https://skulltronics.net/share/fixed/tv/philips_A59EAK071X01_1.1.jpg

25" tube 2:
https://skulltronics.net/share/fixed/tv/philips_A59EAK071X01_2.1.jpg
https://skulltronics.net/share/fixed/tv/philips_A59EAK071X01_2.1.jpg
https://skulltronics.net/share/fixed/tv/philips_A59EAK071X01_2.1.jpg
https://skulltronics.net/share/fixed/tv/philips_A59EAK071X01_2.1.jpg
https://skulltronics.net/share/fixed/tv/philips_A59EAK071X01_2.1.jpg

25" tube 3:
https://skulltronics.net/share/fixed/tv/philips_A59EAK71X01_3.1.jpg
https://skulltronics.net/share/fixed/tv/philips_A59EAK71X01_3.2.jpg
https://skulltronics.net/share/fixed/tv/philips_A59EAK71X01_3.3.jpg
https://skulltronics.net/share/fixed/tv/philips_A59EAK71X01_3.4.jpg
https://skulltronics.net/share/fixed/tv/philips_A59EAK71X01_3.5.jpg

buttersoft

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 792
  • Last login:Yesterday at 02:13:31 am
  • Is running at 15kHz
Re: 21" tube to a 28" TV chassis?
« Reply #7 on: February 11, 2019, 08:34:23 pm »
Someone else's CRT always looks better than your own :)

Paradise

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 60
  • Last login:February 13, 2019, 04:42:29 pm
Re: 21" tube to a 28" TV chassis?
« Reply #8 on: February 13, 2019, 07:03:37 am »
That means i have to bring my secret weapon to the fight - the Sony GDM-FW900 >:D