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#61
05-25-2023, 07:24 PM
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#62
05-25-2023, 09:27 PM
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i replaced them on mine as well.
BOY the new ones are tiny! http://suzaku.live-evil.org/0525232112a.jpg also replaced the cap on the contrast pot, i don't think the old one is very good! http://suzaku.live-evil.org/0525232112.jpg
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#63
05-26-2023, 10:00 AM
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
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#64
05-26-2023, 11:22 AM
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The multi lytics in the set are as such.
C1-A&B (80uf@450) are impossible to reach cause of no room, (filters) C1-C is 20uf @ 350 and may be able to isolate and relocate as it's for the grid of audio output. C2A 80uf @ 450 filter C2B 50uf @ 450 filter on vert output C2C 30uf @ 450 filter C3A 20uf @ 450 filter bottom of voltage divider C3B 20uf @ 450 filter video amp 1 C3C 20uf @ 450 audio out xformer Just can't do anything to C1 w/o destroying it.  
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#65
05-26-2023, 01:51 PM
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#66
05-26-2023, 03:08 PM
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Perhaps they are OK, but I don't know yet, in most sets I have done so far many were bad, C4 was definitely bad and leaky testing a 2x norm value, C5 was also too high @ 81uf, (cathode cap vert output ) , now has new TVA1414-E3 Sprague ATOM.
I don't have one of those old fancy vintage cap leakage testers, wish I did, but from what I have seen, if the testers I DO have (I have 2) show the value to be way WAY above the posted value, chances are it's leaky and not to be trusted, like the example of the 100uf testing a 208 on both testers.
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#67
05-26-2023, 06:40 PM
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If you want your restoration to look OEM on the inside, you can get newly manufactured multi section can lytics from CE Manufacturing. I bought a new capacitor from them to replace C1, just in case it failed to reform.
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#68
05-27-2023, 06:20 PM
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Only 2 new tubes have come in so far, the mixer/ osc for the tuner, and the video amp V6 12GN7A, no change in the picture yet, VERY weak luminance that is overpowered by color.
In grayscale setup it does not take much turning up of the screens at all to make a bright line on all 3 guns, but when in normal mode, nothing is seen on the screen cause luminance is so low getting to the CRT. You have to turn the screens up too see anything at all. 3 good 6GH8As are coming, as is the 1st video amp cathode follower tube 6LM8 (V6) I have not found any other bad resistors so far, hopefully this is just a case of tired tubes, as mentioned, they seem to be all original.
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#69
05-27-2023, 06:51 PM
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12GN7A tubes are one of the most impressive vacuum tubes to have been mass produced. It has a very impressive gain, and its plate can handle 12 watts. Not bad for such a small tube.
I think the luma issue is due to the weak 6GH8A blanker.
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#70
05-27-2023, 08:00 PM
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__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#71
05-27-2023, 09:30 PM
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The 6GH8 blanker and the 6LM8 video amp really need to be 100% in these chassis. Earlier Magnavoxs did use a 6GH8 in place of the 6LM8s. Also, unlike most all other brands, the brightness control on Magnavoxs has an effect on the set up service line adjustment. I always start with brightness, contrast, and kine bias controls tuned down. After set up and tweeking adjustments, if brightness is lacking check resistor R74, on the cathode of the 12GN7 ( shown on your post number 51). The resistor is usually underneath the tube socket on the foil side of the board. The diagram shows a 470 ohm, some sets used a 270 ohm. On sets needing more brightness range I replaced the 470 with a 270, made quite a difference.
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#72
05-28-2023, 01:10 PM
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https://www.youtube.com/watch?v=XwJplJKppqc
2nd video its pretty clear that the filters are not up to snuff.
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#73
05-29-2023, 11:19 PM
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http://suzaku.live-evil.org/magg1-cap.jpg
going to try and replace what Caps i can C2a C2c C3a hopefully that will clear up that noise in the screen ( bar riding up )
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#74
05-30-2023, 08:16 AM
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USPS is living up to it's reputation of reliability and efficiency as always (heavy sarcasam ), as the new 6MD8, which should have been here today, decided to take a 1,800 mile sightseeing trip from the local PO 15 miles away, to Teterboro NJ, WAY TO GO, USPS!
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#75
05-30-2023, 02:08 PM
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Linear Mode
