trashedcabs
Grand Master
Service manual for the DWT2704 says either Orion, Samsung, or LG-Philips. It would be a good candidate.
Alright School Me Please - Nanao MS2930/31/33 Tube Swap
- Thread starter RealMFnG
- Start date
Service manual for the DWT2704 says either Orion, Samsung, or LG-Philips. It would be a good candidate.
trashedcabs
Grand Master
Not blast specific but I've done a couple dozen tube swaps on various monitors now with varying success. At this point I check FB marketplace, craigslist etc for TVs multiple times per day. This is typically how I find out tube candidates before I drive hours to go pick something up:
-Ask the seller for a picture of the rear sticker if they didn't take one.
-If the seller is being an idiot and won't provide one, look up "*brand* 27 inch tv" in Google image search and see if you can find the same one with the model number listed.
-Look up the model number and then "service manual". You can usually find sites that host them for free (elektrotanya, manualslib etc). They're ad spammy but legit. Don't bother with the owners manuals, you need the service manuals specifically. CTRL+F for "A68" "M68" or "VB68" should jump you right to the tube model number.
-Some brands issued generic service manuals for all TVs that share the same chassis model number. Look up the service manual for the chassis model number instead.
-Some brands, specifically Panasonic, only list internal part numbers. Your only option is to hope someone else opened it already and posted about it online, or get it and try your luck yourself.
I am mostly piecing together 27" monitors from chassis, yokes, and frames I have accumulated, since complete monitors are near impossible to find in my area. Generally my experience is as follows:
-I have overall had the best luck with yoke swaps on Samsung and Matsushita tubes. The exception being the flat Samsung A68QCP893X which I absolutely could not get decent purity with using a PF or PFX yoke, no matter how many magnets I glued on.
-Panasonic usually--but not always--used their own tubes and are a safe bet. Whether or not the face curvature will fit your bezel exactly depends on the tube. LWF series is too flat for a Blast bezel, but will produce a great image.
-I have only used LG-Philips flat tubes (QCU series), and was unable to get good convergence with any of the flat yokes I had. I have no experience with their older curved ones.
-A lot of the JVC sets use bonded yokes. Not all, but many. Avoid these unless you really know what you're doing.
-For these Japanese monitors I avoid RCA, Thomson, Zenith etc. Usually they have bonded yokes as well and the yokes are not what we need.
-I have only had a single Orion tube, an Orion A68KTB359X. It has mated decently with all the curved yokes I've tried, but the focus is quite poor. Good enough for 15khz but nothing higher. My tube might be contaminated or something though, YMMV.
-Many brands, such as JVC and Funai will have branded tube stickers. Ignore those. If it says "SDI" somewhere, it's Samsung. If it has the little M logo, it's Matsushita.
-If you don't HAVE to yoke swap, then don't. I've been scooping up dual-focus "EDTV" sets and using them with modded PF chassis with great success. The yokes are within range and even the cheapo Novel A68CPBB00X looks stunning once dialed in.
Hope this helps someone.
-Ask the seller for a picture of the rear sticker if they didn't take one.
-If the seller is being an idiot and won't provide one, look up "*brand* 27 inch tv" in Google image search and see if you can find the same one with the model number listed.
-Look up the model number and then "service manual". You can usually find sites that host them for free (elektrotanya, manualslib etc). They're ad spammy but legit. Don't bother with the owners manuals, you need the service manuals specifically. CTRL+F for "A68" "M68" or "VB68" should jump you right to the tube model number.
-Some brands issued generic service manuals for all TVs that share the same chassis model number. Look up the service manual for the chassis model number instead.
-Some brands, specifically Panasonic, only list internal part numbers. Your only option is to hope someone else opened it already and posted about it online, or get it and try your luck yourself.
I am mostly piecing together 27" monitors from chassis, yokes, and frames I have accumulated, since complete monitors are near impossible to find in my area. Generally my experience is as follows:
-I have overall had the best luck with yoke swaps on Samsung and Matsushita tubes. The exception being the flat Samsung A68QCP893X which I absolutely could not get decent purity with using a PF or PFX yoke, no matter how many magnets I glued on.
-Panasonic usually--but not always--used their own tubes and are a safe bet. Whether or not the face curvature will fit your bezel exactly depends on the tube. LWF series is too flat for a Blast bezel, but will produce a great image.
-I have only used LG-Philips flat tubes (QCU series), and was unable to get good convergence with any of the flat yokes I had. I have no experience with their older curved ones.
-A lot of the JVC sets use bonded yokes. Not all, but many. Avoid these unless you really know what you're doing.
-For these Japanese monitors I avoid RCA, Thomson, Zenith etc. Usually they have bonded yokes as well and the yokes are not what we need.
-I have only had a single Orion tube, an Orion A68KTB359X. It has mated decently with all the curved yokes I've tried, but the focus is quite poor. Good enough for 15khz but nothing higher. My tube might be contaminated or something though, YMMV.
-Many brands, such as JVC and Funai will have branded tube stickers. Ignore those. If it says "SDI" somewhere, it's Samsung. If it has the little M logo, it's Matsushita.
-If you don't HAVE to yoke swap, then don't. I've been scooping up dual-focus "EDTV" sets and using them with modded PF chassis with great success. The yokes are within range and even the cheapo Novel A68CPBB00X looks stunning once dialed in.
Hope this helps someone.
Mrhide
Legendary
Well well … just moving it with the handles i though “what a nice case… i am keeping it”
After opening it, surprise surprise!
i guess it wont go in guitarfreaks to run guitar hero after all! 
For info, the model#
Last edited:
Williamcritchfield
Enthusiast
What are the chances the symphonic wf2702 have the same tube as the wf2703. I know the wf2702 has the right tube which is A68QBT892X. Can’t find any info on crtdatabase on wf2702. Looking at pictures of the outside it’s the exact same tv. Hate to make a long trip for nothing
trashedcabs
Grand Master
Williamcritchfield
Enthusiast
Nice I never thought to search for a service manual. All I looked at was the regular manual. Thank you. Don’t suppose you know if both would work? Guy wants 125 and it’s a 3 hour drive. Says it was his grandparents and it was put in storage after they died and they only had it for a year. I just looked at service manual and the way I read it yoke is not bondedService manual says it's either the Samsung QBT series or Orion KTB series
trashedcabs
Grand Master
I have used the Orion with the MS2930 yoke. It works but the tube is not as nice as the samsung. IMO I would pay like $50 for it not $125
Williamcritchfield
Enthusiast
Might just wait for one to pop closer then. Would suck to drive 6 hours round trip and it be the inferior Orion tube. With my luck it would be. Sure would be nice if the back of the set would just say what tube is in it…. Thanks so much for your help