CurtPalme.com Home Theater Forum

**AnalogRocks**

I am in need of a Toshiba picture tube for a vintage Commodore 1702 monitor. I also need the yoke and magnetics. Anyone got a dead monitor with a good tube?

geek

ecrabb · Posted: Thu Aug 05, 2010 3:12 am Post subject:

I might. Is this the one with the separate RCA connectors for y/c for the Amiga?

If so, you won't need the parts - the monitor itself is very nice. I'll make you a deal!

SC

**AnalogRocks** · Posted: Thu Aug 05, 2010 3:24 am Post subject:

Ohh I have 4 good working ones. I just want to restore this one Laughing

**kal** · Posted: Thu Aug 05, 2010 1:51 pm Post subject:

Ahh, the memories.

I still have a 1701 tucked away in the back of my furnace room.

I googled but couldn't find any information on what's different between the 1701 and 1702. Every site I found simply called them "nearly identical". Anyone know?

EDIT: Found it!

"The difference between a 1701 and a 1702 is that the 1701 was supplied with a 5 pin DIN video cable and the 1702 with a 8 pin DIN video cable."

Kal

skippyar · Joined: 22 May 2009 Posts: 108 Location: Bristol, UK

Memories indeed.

My Commodore 1084 I recently restored.

Paul.

**AnalogRocks** · Posted: Sun Oct 17, 2010 7:08 pm Post subject:

Nice!

**kal** · Posted: Sun Oct 17, 2010 9:51 pm Post subject:

Funny, I still have 2 or 3 disk containers full of 5-1/4" C-64 floppies that I don't want to give up.

"You'll pry them from my cold dead hands!" I tell my wife.

(The ironic part is that I bet most of them don't work anymore... but don't tell her that) Wink

Kal

**AnalogRocks** · Posted: Sun Oct 17, 2010 11:22 pm Post subject:

**kal** · Posted: Sun Oct 17, 2010 11:39 pm Post subject:

Yup. Of course! And my MSD super disk drive too. The standard 1541 drive was problematic (would get out of alignment easily) so I bought an MSD drive way back when.

Details: http://en.wikipedia.org/wiki/MSD_Super_Disk

Kal

**AnalogRocks** · Posted: Sun Oct 17, 2010 11:48 pm Post subject:

ekwoodard · Joined: 11 Jun 2010 Posts: 14 Location: Boise, ID

I have an old commodore monitor not sure what it is. The model number is not in the front like the one above. It is gray with a plastic screen over the glass screen. I can't pull it out w/o waking up the wifey, to read the model number. I have tons of extra C64 stuff including working systems and 18 shoe boxes full of working floppies. Before you ask-YES, I use it.

**AnalogRocks** · Posted: Mon Oct 25, 2010 6:39 am Post subject:

Excellent! I don't want you to part out a working monitor. I'm looking for someone that has a non functional monitor with a good tube.

What do you use the C64 for most?

ekwoodard · Joined: 11 Jun 2010 Posts: 14 Location: Boise, ID

I use it primarily just for the old games. I also have a complete set of Boise State Bronco Football Stats 1932-2009 on it. This is just for ease of access when an argument arises during a game. I already had 1932-1987 stored on disk.

Wombat · Joined: 18 Aug 2006 Posts: 16

I'm tripping over one in the basement, in working order last time I used it. I found a cable at the "Buck Or Two" store (SVHS to RCAs) that works with the chroma/luma inputs. The curvy tube and huge dot pitch is a bit disappointing, though. And I think there's a splotch of discolouration on the tube, though not objectionable.

Anyone on Vancouver Island willing to adopt a Commie monitor, send me a private message or something.

**AnalogRocks** · Posted: Mon Nov 15, 2010 6:26 am Post subject:

Ahh too bad too far away. They are great monitors for their day.

rstor · Joined: 14 Jul 2014 Posts: 4

**AnalogRocks** · Posted: Mon Jul 14, 2014 5:22 pm Post subject:

What exactly are you seeing? It does look like a difference in picture tubes. I bet if you open both monitors up you will see two different model tubes.

It could be as the guys on the other form say. Different shadow mask or dot pitch.

As for the "vertical flow" that could be a ground loop. Try plugging the monitor into the same outlet as the computer.

If you get a chance post some full screen pictures here too.

BTW never did find a tube for mine Laughing

**kal** · Posted: Mon Jul 14, 2014 6:42 pm Post subject:

Wow - talk about a blast from the past!

Kal

rstor · Joined: 14 Jul 2014 Posts: 4

**AnalogRocks** · Posted: Mon Jul 14, 2014 10:25 pm Post subject:

Are the bars in the pictures scrolling upwards?

As for fixing it. Maybe. It could also be used, used, used. The tubes in these monitors are ES focused, (Electrostatically Focused). The beam is focused through an aperture ( hole ) and, as the electrons fly through the apeture they erode the surrounding material. Lessening the beam focus as the tube ages. Giving you a softer picture.

Now, that being said. This wouldn't account for the bars in the pictures unless those are just a by product of your camera? That could be electrical maybe a ground on the jack, bad solder joint. Capacitors may be dried out too causing electrical gremlins.

You can tweak the focus on the flyback (High Voltage transformer) but it may already be tweaked. You can also try the astig rings on the tube (watch out for the 400-600volts there )to see if you can get a smaller dot size. Keeping in mind they tended to do that at the factory and then glued the rings in place. There could come a point of diminishing returns.

The bad focus could all be a by product of age.

What end of T.O. are you in BTW?