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Yoke and tube specs for monitors

If anybody is interested, I found what I believe to be a perfect donor tube for a Toshiba PF D29C051 common in NNC cabinets.

I was looking on my local facebook marketplace listings for old 4:3 27” flat CRTs and this one came up:

061C4444-133C-40D5-81F1-8B2AD126B9E1.jpeg


Advent HT2751A

It’s a boring, no-name, progressive scan display, but I looked up the service manual and found out the tube inside is model A68LTF356X, the exact one found in most NNC cabs.


02E1C3E7-41EE-4188-8BDC-C7AB6C56BF9F.png

I think I lucked out. I’m going to pick it up this weekend and sometime soon I’ll test the yoke and post measurements here.
 
In this case the focus is just the winding ratio of the flyback, yeah. That, or B+ voltage, which could be influenced by the horizontal deflection if the monitor power supply is designed that way (as many are)
 
Just to follow up on my last post, turns out I got my hopes up for nothing... picked up the TV over the weekend, popped open the case and took a look at the tube. It’s definitely not what the service manual claims is in there...

1CB21FDD-50E9-4B20-9CBA-E8C6C768FD96.jpeg

I presume this tube is at least the same “shape” as the A68LTF356X since this is listed as the part number in the manual, but I doubt the quality of the tube is a worthy replacement for a proper Toshiba PF model... I may still check the yoke specs for kicks when I have the free time.
 
ninjaz0mbie said:
Just to follow up on my last post, turns out I got my hopes up for nothing... picked up the TV over the weekend, popped open the case and took a look at the tube. It’s definitely not what the service manual claims is in there...

1CB21FDD-50E9-4B20-9CBA-E8C6C768FD96.jpeg

I presume this tube is at least the same “shape” as the A68LTF356X since this is listed as the part number in the manual, but I doubt the quality of the tube is a worthy replacement for a proper Toshiba PF model... I may still check the yoke specs for kicks when I have the free time.
Click to expand...
looks like the one i have in my naomi cab
 
Shanghai Novel tubes were regularly paired with Sanwa chassis.
 
nem said:
Shanghai Novel tubes were regularly paired with Sanwa chassis.
Click to expand...
Is this a decent tube then?

I think the boards for both sanwa and toshiba chassis were interchangeable, right?

Also I noticed on the AO wiki that the neck board has different C228 capacitor for the Toshiba tube versus the Matsushita tube. Does that mean I may need to play around with this component if I swap out a tube from another brand like this? Do you think there would be any danger in plugging it in to try it (presuming the yoke measurements are ok)?
 
Check if it's a decent tube by looking at it :P

If the yoke checks out, I expect trying it will be safe.
 
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CRT Model No.Dy No.LH (mH)LV (mH)RH(ohm)RV(ohm)
Toshiba curved SF 25" A59JMZ90XD3YS-57696A0.54219.750.89.5
Toshiba curved SF A63JHF81X(MS8-26SC)05F18173A20.538.190.739.4
Toshiba curved SF A68KJU96X0105F18624A1/TY-29KF4L0.3814.50.66.9
Toshiba curved SF A68KJU96X5F18389A1/YS-598020.4418.40.76.6
Toshiba curved SF A68KJU96X0AF18002A10.20514.66
**Toshiba curved SF A68KJU96X01TY-29KF4L0.5519
Toshiba PSF A68LTF356XTDY-5294A0.3114.40.78.1
**Toshiba PDF A68LTF356X98TY-29RK000.3180.612
Toshiba A68KSM696X05TY-29K4JN1.25171.47.5
Toshiba A68LBT696X 0.19916.19
Toshiba A68KZN696X05F18745A10.19816.33
Toshiba curved SF M68LLR696X02 0.2040.3574.75.65
Toshiba A68KSM696X05 1.19517.58
Toshiba 曲面 A68KTB189X89351322TY-5292A0.31613.59
Toshiba 曲面 A68KTB189X89350309TY-5292A0.31613.67
Toshiba A68KFS60X 0.319.20.68.1
Toshiba A59JME193X5F18381A10.3419
LG SF A68QCU770XV56150Z-1345C0.38.310.475.72
LG M34KWW20X01ZEC-9228-050.397
LG PDF A68QCU259XV36150Z-1340F0.3058.18
LG PDF A68QCU259X006150Z-1340F0.3058.18
LG PDF A68QCU259X536150Z-1240A0.72217.29
LG PDF A68QCU270XV36150V-5006K0.3048.2
LG PDF A68QCU270XV36150Z-1349B0.3048.2
LG PDF A68QCU270XV1 0.3 8.4
LG PF A68QFD290X032 0.3 8.2
LG PDF M68QDY259X01 0.1950.416.699.32
LG DF A68QBC230X516150Z-1043F0.9123.1
LG SF 曲面 A68KYN690X153-146D0.71117.13
LG/PHILIPS A59EAK071X44 0.386.20.363.58
LG/PHILIPS A59ERF181X44AT7110/400.48.450.527.44
LG/PH PSF A68QFD290X032 0.38.20.456.2
PHILIPS A68LIC82X66 0.247.76
PHILIPS A63AFW36X9A3002-10.3817.70.78
ORION curved A68KTB180X 006 ODY-C290300.8518
ORION curved A68KBT130X 006 ODY-F290060.9619.6
ORION PSF A68QFD290X032 0.30.458.26.2
ORION curved A68KTB140X (YS-59801)YS-598010.39518
Samsung curved SF A68KVL74X02 1.35201.377.9
Samsung curved SF A68KVL74X03DSM-2912QL0.3318.61.7510.3
Samsung PDF A68QCP891XCDY-290890.175.1
Samsung PDF A68QCP891XSCD-291031.117
Samsung PDF A68QCP891X002 0.336.40.594.99
Samsung PDF A68QCP891X004DIF-2912DA0.3197.4
Samsung PSF A68QCP693X002 0.3150.57.55.2
Samsung PSF A68KVL74X01DSM-2912EL1.3520
Samsung PSF A68QCU270XV36150V-5006K0.38.2
Samsung PSF A68QCU270XV36150Z-1349B0.38.2
Samsung PSF A59QDF891X200DIF-2512DA(3P)0.38.30.486.05
Samsung curved SF A68QBT892X02DSM-2912QL0.3318.61.7510.3
Samsung curved SF A68QBT892XCDY-29350.333.5
Samsung PSF 25" A59QDF891X200 0.38.30.486.05
China made CRT curved C11029SHS/CJG2-21.06316.55
SHANG HAI curved SF 64SX501Y22SY-2531010.47.5
Thomson FEG PSF A68ELA011X121 0.312 8.5
YS 73SX701Y22-DC22CDY-FT-29080.42317.64
YS 73SX707Y22-DC01 0.96
Mitsubishi A68QCU259X71 0.9611.8
Mitsubishi A68KYW33X330P182010.9825.71.312
MItsubishi A63JHF81X05F18173A2/YS-562410.68
SHARP A68KKN96XH1746GE/946LGT0.39217.5
Panasonic SF M68LUQ085XKDY 4UHE05F0.2589.20.3046.8
RCA A68AEG25X02HPY300.9520
RCA A68AEG25X0368Q2UBZ/000.24223.5
RCA M80EPE14X12279LMPRZ/K10.297.7
LICUS SF A90AEJ15X10 0.2887.83
LG PHILIPS A80ERF042X64 0.2499.55
PHILIPS A80EFF002X43 0.3475.81.36.9
PHILIPS A80EFF222X53 1.089.271.36.9
Zenith curved SF B63AFW22X9321131.0910.5 9
Zenith curved SF R-A63ADG25X9324131.0610.231.34.8
LG DF W76QDD259XV2 0.3047.260.649.17
HITACHI A68KSA30X07
(RICK) 90LSW095X 0.228.60.4867.04
RCA/PENTRANIC A89PNT30XTCE-89L2UBZ/0.23570.3
RCA/PENTRANIC89LMPRP000.2927.68
PENTRANIC SF A68PNT18X2G227007-22A0.2460.42.4
PENTRANIC SF A68PNT18X2G227007-22A0.2424
CHUNGHWA SF A68AKY13X503ANXPX295010.38.4
 
CRT Model No. for CH-666A-29Dy No.LH (mH)LV (mH)
Toshiba curved SF A68KJU96X0105F18624A1/TY-29KF4L0.3814.5
Toshiba curved SF A68KJU96X5F18389A1/YS-598020.4418.4
Toshiba curved A68KTB189X89351322TY-5292A0.31613.59
Toshiba curved A68KTB189X89350309TY-5292A0.31613.67
Toshiba A68KFS60X 0.319.2
Toshiba A59JME193X5F18381A10.3419
ORION curved A68KTB140X (YS-59801)YS-598010.39518
Samsung curved SF A68KVL74X03DSM-2912QL0.3318.6
Samsung curved SF A68QBT892X02DSM-2912QL0.3318.6
YS 73SX701Y22-DC22CDY-FT-29080.42317.64
SHARP A68KKN96XH1746GE/946LGT0.39217.5
 
@Hatsune Mike Saw your tweet about the MS9 tube on Sanwa PFX. I've got two of these PFX's (With original tubes, Hitachi and Shanghai novell) and the image on 15Khz is amazing.

Considering to upgrade the MS9 tube to these PFX chassis to get trisync, is the picture on VGA any good with the low res tube?
In my case the Shanghai novell is great, but a Hitachi tube has a 'round' effect where it develops a pattern around the edge.
As these are single focus i expect the VGA image to be a bit lesser of quality?
 
I don't think the MS9's tube is any lower in pitch than the PFX original. I'm pretty sure the original PFX tube is also single focus.
 
Asure said:
@Hatsune Mike Saw your tweet about the MS9 tube on Sanwa PFX. I've got two of these PFX's (With original tubes, Hitachi and Shanghai novell) and the image on 15Khz is amazing.

Considering to upgrade the MS9 tube to these PFX chassis to get trisync, is the picture on VGA any good with the low res tube?
In my case the Shanghai novell is great, but a Hitachi tube has a 'round' effect where it develops a pattern around the edge.
As these are single focus i expect the VGA image to be a bit lesser of quality?
Click to expand...
I have three different tri-sync and one quad sync crt arcade monitor. As far as I can tell, they all just use the same tubes as found in regular SD crt tv's. It's only the chassis that differs between tri-sync and cga only monitors.

There is no need for a finer pitch for vga mode because the tubes were already designed for 640x480. It's just the frame rate that differs between 480i and 480p.

late model SD CRT TVs started using a slightly finer horizontal pitch (0.8mm instead of 0.9mm) but the difference is negligible. It looks nothing like the 0.3mm pitches found on high end broadcast monitors or crt PC monitors.

All of my crt arcade monitors produce a nice 480p image during games. Your Windows desktop is never going to look great on a corpse pitch tube but that shouldn't matter much.
 
Hatsune Mike said:
I don't think the MS9's tube is any lower in pitch than the PFX original. I'm pretty sure the original PFX tube is also single focus.
Click to expand...
Afreed, but you have no wierd effects using the pfx chassis with ms9 tube and yoke? Hsize and such are fine? Flat vs curved was no issue?
 
Yep, that's all been fine. If dimensions are off a tiny bit, you can do well by slightly reducing HV for a larger picture (not changing B+, just the HV itself). MS9 tube and yoke are plug and play; all the same connectors and suitable impedance ranges.
 
can a Toshiba PF D29C051 chassis work on a tube that a 2930/31/33/34 chassis work on?
 
No, that chassis also expects MS9-like impedance, yet the focus voltage is typically a tiny bit too low on typical Toshiba MS9 tubes. If you pair it with a Hitachi MS9 tube, you'll get a low heater voltage, but exchanging the current-limiting resistor can bring that up to 6.3v and then you'll have a workable focus range.

tl;dr:

Toshiba D29CR051 "NNC" chassis pairs well with the Hitachi MS9 tube after exchanging heater resistor
Sanwa PFX chassis pairs well with Toshiba MS9 tube without modification
 
other than a pfx chassis on a pfx tube what other chassis can you use on a pfx chassis.
 
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