Rare find! A Magnavox Brittany tv!

[Kevin Kuehn]

The ETF has 3 Merit HVO-5 listed. There's one on ebay but beware there are several cracks in the core. Must have been dropped a few times. At least you can see what it looks like.

[Yamamaya42]

Originally Posted by Kevin Kuehn

The ETF has 3 Merit HVO-5 listed. There's one on ebay but beware there are several cracks in the core. Must have been dropped a few times. At least you can see what it looks like.

I saw that

If the original one doesn't work, will have to get one from ETF.

Starting Audio section now, it has been worked on before, not very well. :/

[Yamamaya42]

Starting to figure out the amp section on this set, as I mentioned, someone has been there before, bad soldering, leads too long, a 1m resistor with 1 end going nowhere, changes from the original design, and, why put in a .15uf cap where it should be .1uf? That has to have SOME impact on operation. :/

[Yamamaya42]

http://suzaku.live-evil.org/0301251431a.jpg

AMP rework

http://suzaku.live-evil.org/0301251434.jpg

FBT

It seems that ETM does not have any HVO-5 s in stick after all.
So if this is bad, it's gonna be a real pain
this this a maggie part?


Replacements are--
Thordarson FLY 4
Merit HVO-5
Stancor A8119
Triad D55
Ram X077

[Yamamaya42]

Status update.
Not much to report, did not have much time to work on it this weekend cause of computer problems (RAID-5 headache ).
16L/CP4 paid for, waiting shipment, (thanks ETF! )
Ordered the broken core HVO-5 seen on E-bay at discount, may give me a baseline to test what is in the set, not even sure if it's original. And if bad, perhaps with the 2, a good one could be made, failing that, there is a 3rd option.
Will soon start on the main electrolytic capacitors.
There are several candohm resistors mounted in the HV case not shown in the parts locator pages, this is most likely the bleeder network, will need close attention, as will the CRT anode wire that has broken off at the 1m resistor, which will need a new HV resistor.

[Yamamaya42]

https://www.youtube.com/watch?v=xos2MnVxe-c


http://suzaku.live-evil.org/0307252316b.jpg

After replacing the main pi filter caps this week, I decided to risk powering it up slowly with 2 new 5U4GBs, and after a while when voltage seemed stable and one paper bomb exploded someplace, not sure where yet I decided to hook the scope up to G1 of the horizontal output tube, well one of the pairs...
https://www.youtube.com/watch?v=NmPhaG1ud38

All the critical bits are working!
I can now move on to making it good as new!

Furthermore the broken core Merit hvo-5 came today, and my guess was right, it's physically identical to the FBT in the chassis now, meaning I can swap the broken bits from it to fix it, most likely Merit made this FBT for maggie in the first place.

[Yamamaya42]

new FBT vs the old..

http://suzaku.live-evil.org/0309251302.jpg
http://suzaku.live-evil.org/0309251304.jpg
http://suzaku.live-evil.org/0309251303a.jpg

It's indeed a merit made unit!
i can swap the broken pats!

the wires in the HV cage is awful. falling apart, needs to be replaced.

[Yamamaya42]

Old windings vs new.

http://suzaku.live-evil.org/0309252037a.jpg

[Yamamaya42]

It's Frankenflyback!

http://suzaku.live-evil.org/0310252008a.jpg
http://suzaku.live-evil.org/0310252008.jpg

[ohohyodafarted]

It's a small world. Here is a link to photos of my Britnay. Maybe some day I will get around to restoring it. Got it from someone in Minnesota about 10 years ago.

https://antiquetvguy.com/WebPages/Th...PhotoPage.html

[Yamamaya42]

I do have to wonder why they used 2 6BG6s in this version, and other versions have only 1, it's not a wimpy tube, (20 watts), does it use THAT MUCH power that they decided to 2x it to reduce the load on the tube?

[Yamamaya42]

That.s much better!

http://suzaku.live-evil.org/0312251534.jpg

http://suzaku.live-evil.org/0312251535.jpg

Fresh NOS tube!

[Yamamaya42]

Some differences between the 16FP4 that was in there and the 16LP4A going in, aside from slight difference in deflection angle and the shape of the bell,which can be adjusted for, is that the 16L has aquadag coating where the 16F did not, also the 16L has a newer type anode connection than the 16F, which it no big deal because the HV line was trashed and had to be redone anyway.
And the final difference is that the 16F had a single pole ion trap where the 16L needs a dual, and I do have a NOS dual one that I hope will work, never used, not sure for what tube it was made for.
https://imgur.com/r3Yt9S5

There is an arrow on the top of it, I assume this points to the screen?

[Yamamaya42]

Had more time to get some work in on it tonight, replaced some paper caps checked resistors.

found some that were REALLY bad.
http://suzaku.live-evil.org/maggy-bad.jpg

not sure how well this thing worked with the HOT g1 bias resistors way out of spec. both were about 230k

I also found what blew up when i did the power test, it was the across the line cap 183, no big deal!

[Kevin Kuehn]

Originally Posted by Yamamaya42

I do have to wonder why they used 2 6BG6s in this version, and other versions have only 1, it's not a wimpy tube, (20 watts), does it use THAT MUCH power that they decided to 2x it to reduce the load on the tube?

If you look at RCA circuits at the time the 16" round CRTs showed up, they also used two 6BG6s and 1B3's. The thought must have been they were pushing the single output setup too hard while scanning that larger CRT. As flyback transformers improved in efficiency they went back to a single horizontal output. And soon after there were stronger horizontal output tubes.