Another Motorola VK-106 restoration attempt

[pdr-fml]

After recap job and replacing few resistors I cranked her up saw a flame up down below in chassis. Turned out to be a tapped power resistor that had one bad section that I had bypassed with new dale screw down power resistor but was still shorting out. Ended up replacing whole thing. I do have variac and was gentle with set at first. All tubes were glowing and static from speaker (no signal attached just looking for raster) but nothing at all on tube. adjusted ion trap all over the place and nothing at all. Also appeared to have high voltage using screwdriver arc test. Pulled all tubes out and let crt filament glow for a couple hours. Still nothing. I looked at voltages at crt neck and looked at schematic for orgins of voltages and started doing a little trouble shooting and pulled 12au7 video output tube. Had put everything back to normal and powered back up and still nothing. Decided to adjust ion trap again and finally got a raster. I got a replacement tube from a source and reinstalled. I am not a 100% percent about tube being problem but am going to test one day. I was really getting discouraged but now very hopeful.

Current problem I am trying to solve is shown in pic below. I got a old tv repair book and for the white vertical strip problem I am seeing as shown the book suggest either damping tube or bad deflection yoke. What do you guys think?

[Kevin Kuehn]

Very nice job on replacing those caps and resistors! I'd agree the damper tube is generally responsible for those type defects on the left side of the picture. First thing I'd try is replacing the damper tube, possibly try a few. Adjusting the horizontal drive control could also have some effect.

[pdr-fml]

Originally Posted by Kevin Kuehn

Very nice job on replacing those caps and resistors! I'd agree the damper tube is generally responsible for those type defects on the left side of the picture. First thing I'd try is replacing the damper tube, possibly try a few. Adjusting the horizontal drive control could also have some effect.

Thanks for the advice. Well I am fresh out of damper tubes -calls for a 5v4g so I guess I will place an order might get two just in case. I will try the drive control before I do that and see what happens.

[pdr-fml]

Originally Posted by Kevin Kuehn

Very nice job on replacing those caps and resistors! I'd agree the damper tube is generally responsible for those type defects on the left side of the picture. First thing I'd try is replacing the damper tube, possibly try a few. Adjusting the horizontal drive control could also have some effect.

Ok. I got rid of the white vertical lines by adjusting the horizontal drive control. When I went to adjust I found that trimmer screw was completely missing. Stole screw from another from trimmer in tuner for channel that will not be used. Unfortunately I have other problems with set and have decided that I need to test all tubes before I go any further. I know someone at work that has a tester and will try to get this done shortly.

[pdr-fml]

It has been over a year since my last post about my motorola vk106 and I have been working on it every now and then but still have issues with it but I am determined to get this thing working. I was just wondering if anyone has actually seen one of these up and running properly or are they all just works in progress like mine is? I guess this would include the VT105 and VT107 which have similar chassis.

[decojoe67]

Originally Posted by pdr-fml

It has been over a year since my last post about my motorola vk106 and I have been working on it every now and then but still have issues with it but I am determined to get this thing working. I was just wondering if anyone has actually seen one of these up and running properly or are they all just works in progress like mine is? I guess this would include the VT105 and VT107 which have similar chassis.

A long-time repairman friend of mine has that model in storage and I've hinted at acquiring it for many years now. He never seems to care about parting with it. I believe he mentioned that those are good players once restored. Here is the only example of that chassis that I've ever seen working. It's the tabletop VT-105 version: https://www.youtube.com/watch?v=MvVt7lppTKQ
I had the chance to get one of those locally years ago. Should've of went for it! Those 10" '48 Motorola's are uncommon.

[Eric H]

Originally Posted by pdr-fml

. I was just wondering if anyone has actually seen one of these up and running properly or are they all just works in progress like mine is?

I have a 105 that I restored and it has a beautiful sharp picture. I haven't run it in a while though.

I nearly forgot I have a (crappy) video of it on YT.
https://www.youtube.com/watch?v=MvVt7lppTKQ

[Phil Nelson]

Originally Posted by pdr-fml

still have issues with it but I am determined to get this thing working.

What are those remaining issues? Seems like you must be getting close . . . .

Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html

[pdr-fml]

Originally Posted by Phil Nelson

What are those remaining issues? Seems like you must be getting close . . . .

Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html

I guess my main problem is that the set has virtually no reception when I hook my digital convertor box up to it. It has actually gotten worse from what it was last time i checked it which was many months ago. I was getting a very faint picture with audio every now and then but now it is next to nothing. Right now I am going to go thru the tedious task of verifying component location and values which is probably a good idea since I did a major recap job shortly after getting the set. I think my tubes are good and I have checked them on a tester. I may be asking you guys about the best way of injecting video from convertor box into the video circuit to try to isolate problem better.