Prewar Marconi 707 - Videokarma.org TV - Video

yagosaga · #1 05-10-2008, 11:54 AM

John:

Quote:

Originally Posted by John Folsom

Way to go, Eckhard! Do you still have the original 7" CRT? As you may already know, there is a French company which is likely going to attempt some pre-war CRT rebuilds. Talk to Jerome Halphen, he knows the details.

I don't have the original Emiscope, but I hope that I can get it in the next weeks. I have also read about the crt rebuilding process in Paul Stenning's forum. It is an interesting thing. But before I deliver it to the French company (if I get the Emiscope), I want to wait for the reports about other crt projects.

At first, I want to replace the present crt-construction in the set with a 7" crt, and I want to solve the focus and width problems.

- Eckhard

yagosaga · #2 05-21-2008, 09:32 AM

Meanwhile I have got a replacement crt from Darius (oldeurope). It is a radar crt, a 7BP7. The crt fits exactly in the Marconi 707. I had to remove a small amount of the cardboard from the center of the yoke, then I could slip the yokes over the neck of the 7BP7.

One remaining fault is in the line output transformer. I do not get sufficient width and linearity. I have to look for a replacement LOT or have to rewind it.

- Eckhard

yagosaga · #3 06-20-2008, 05:07 PM

Quote:

Originally Posted by yagosaga

One remaining fault is in the line output transformer. I do not get sufficient width and linearity. I have to look for a replacement LOPT or have to rewind it.

Hi,

the lopt was actually bad. Ed Dinning in UK has rewound the lopt. Today I got the rewound lopt, and tonight I have installed the rewound lopt. The tv set has full line width without any further complications. Ed did a great job. I am so happy that the lopt is working properly now.

Some work on the focus coil is on my to-do list.

Kind regards,
Eckhard

yagosaga · #4 07-21-2008, 09:41 AM

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