Motorola VT-71 restoration (TS-4J chassis, Blonde cabinet) - Page 2 - Videokarma.org TV - Video

Zenith26kc20 · #16 09-10-2009, 09:27 AM

Well, I did it again... I misplaced the schematic of my TS-4J and I want to finish the vertical circuit before I put it back in it's case (been freaking customers out with it naked in the shop). If anyone can scan the vertical I would really appreciate the help.
Oh, it is OK to ridicule me for losing the schematic... again!

bandersen · #17 09-10-2009, 12:06 PM

TS-4J early or late ?

Zenith26kc20 · #18 09-10-2009, 01:36 PM

October 2, 1948. If there is more info please let me know and I will post it.
Thanks!

bandersen · #19 09-10-2009, 01:49 PM

An easy way to tell is from the Contrast control. The early version just has one end grounded. The late version has a few capacitors and resistors attached to all 3 legs of that control.

Zenith26kc20 · #20 09-10-2009, 02:19 PM

Contrast control only has two wires.
Thanks!

bandersen · #21 09-10-2009, 03:54 PM

Here you go.

TS-4J Early page part 1
TS-4J Early page part 2

Those came from a Wallace Telaide which has ledger size pages so I had to split it into two scans. Hope you can read it.

Bob

Zenith26kc20 · #22 09-10-2009, 04:19 PM

Many thanks!!

jr_tech · #23 09-10-2009, 08:38 PM

Quote:

Originally Posted by bandersen

Knobs, knobs knobs! I have 3 Motorola 7" sets that need complete sets of knobs. Mahogany, Blonde, Bakelite. Here's the knobs I have.

Here's my guestimation

Far-left is from a Motorola 9VT1 like this one

Swirled, tan smaller knobs - no idea!

The center group of brownish knobs is for the mahogany and blonde. Not sure about the darker/lighter brown or the circular inset color.

Finally, my lone golden knob for the bakelite set courtesy of Zenithfan1 (thanks Mark!)

My 2cents worth (or less)

I have a bakelite and a wood 9" with the type of knob shown in picture 1. Perhaps these sets are not correct?

I have seen the tan swirled knobs on the leatherette-covered "portable" (VT-73) version... picture 2

I have also seen the tan knobs on a blonde set. (looked good IMHO)

I have a Black bakelite 7" with the gold knobs... picture 3

jr

jeyurkon · #24 09-10-2009, 10:39 PM

Quote:

Originally Posted by jr_tech

My 2cents worth (or less)

I have a bakelite and a wood 9" with the type of knob shown in picture 1. Perhaps these sets are not correct?

I have seen the tan swirled knobs on the leatherette-covered "portable" (VT-73) version... picture 2

I have also seen the tan knobs on a blonde set. (looked good IMHO)

I have a Black bakelite 7" with the gold knobs... picture 3

jr

The knobs on my 9VT1 are exactly like the ones in your photo 1. The clear outer channel indicator part of the knob somehow seems newer than the rest of the knobs. Maybe it was just better plastic.

John

bandersen · #25 09-10-2009, 11:34 PM

Thanks for the info. I've never seen those stylized "M" knobs before- very cool.

Those gold knobs look awesome on the bakelite set. I'm restoring one of those as well and only have the Volume knob so far.

I've got a VT-73 too with a complete set of knobs.

I think the tan knobs look great on the blonde and I'm leaning towards those even though my set came with a couple of the darker brown knobs.

bandersen · #26 09-10-2009, 11:41 PM

My hand-rubbed lacquer supplies arrived today

I ordered these just before I read John's post about micro-mesh. That product seems promising (and less messy) so I think I'll give it a try on the next project.

bandersen · #27 10-02-2009, 08:37 PM

My stupid printer ran out of color ink and I spent a few weeks finding a reasonable priced "refilled" cartridge. Here are the dark brown decals applied to the control area. This system works quite well.

Now I'm working on burying the decals in a few layers of lacquer. Then, I can finally start working on the hand rubbed finish!

jeyurkon · #28 10-03-2009, 12:41 AM

Looking good! John

bandersen · #29 06-29-2010, 07:19 PM

Here's a long overdue conclusion to this project!

The set was suffering from visible retrace lines so I tried out this modification I had to tinker with the resistor value to maintain vertical stability. 47K worked out well.

That eliminated the retrace lines, but now I have random bright streaks in the picture. This was due to positive spikes in the retrace suppression signal.

I added a clamping 1N4007 diode across the 47K resistor and the signal is a lot cleaner now.

So is the picture

Here's the circuit I used.

bandersen · #30 07-06-2010, 06:58 PM

I'm finally calling this project done

I made some reproduction high voltage warning decals for this and another set using white backed water slide decals.

Time to put it all together.

Here's the original back. I'd love to get a couple more of these for my other sets

Here's the front. My restored / veneered photo finish is too orangy, but I can live with it. Someday I may give it another try. I've heard bamboo veneer is a good match.

I had a heck of a time getting the reproduction mask to line up properly. The upper-right is still off a bit.

There are a couple flecks on the screen and a burn hole near the bottom. Not too bad considering the base had been ripped off this CRT!