#16
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So I got a 0-500 dc ammeter. I have a few things to report in. Im cleaning the hv leads and cage. I am also getting ready to pull the fly cage to re silicone. One thing I forgot to mention is that I did end up loosing vertical but there was still a bit of something you could adjust with the brightness which I imagine was the horizontal. The boost rectifier diode has gone open. It is listed as a 1n3195. Sr102/X6 has also failed. It is in series with the yellow lead going into the primary of the vertical output. Im having trouble finding a replacement for it. It is a hv rectifier and is listed in sams under General electronics GECR-2. So I will need to replace the boost rect diode and hv diode. You suggested fusing the h output cathode with a .25 amp fuse. What voltage rating? |
#17
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Any of these should work for the boost diode. https://www.mouser.com/Semiconductor...r45Z1yopdfySGT May want to put 2 in series to ensure the replacement can take any possible voltage spike. Radio Shack used to sock a 2A 1.5KV part that I used to replace the boost on my CTC-15 but they ain't a thing anymore. Parts like diodes in sets of this vintage are probably over 3 generations obsolete so it is easier to look up the key specs and spec out a new one than find and trace forward all the missing links in the recommended successor line.
Any voltage of fuse is fine. The only spec that matters for fuses is the current. A you can take a .25A 125V fuse and put it in a device that wants a .25A 250V and vice versa and the device will work okay and the fuse will still blow at .25A current. You probably want a slow blow and not a fast acting fuse...The current averages ~200mA but spikes above 250mA for tiny fractions of each second. A fast act fuse is designed to catch that fractional spike and blow (creating lots of nuisance failure which you don't want) but the slow blow will average out the current and only blow when the average current reaches fault value.
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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 |
#18
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https://www.mouser.com/ProductDetail...%252bUjA%3d%3d Should work well right? Also wanting to find a sub for 1n3195 heres the data sheet. There is a NOS 1n3195 on ebay for cheap. That is also an option. https://www.datasheets360.com/part/d...1594065512865/ Last edited by ZenithNut; 11-25-2018 at 04:39 PM. |
#19
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The second diode looks like a common 1N4007 should be a sub for it. In most tube circuits the important specs for the replacement diode to match or exceed are PIV (peak inverse voltage) and average forward current. The rest usually makes little difference.
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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 |
#20
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One last thing is speed ( forgot what they called it ).
If you use a common 3A 1KV rectifier as a scan rectifier it will blow within a few hrs because it overheats. Cant take the higher freq. Same goes for in switching supplies. IIRC boost diodes didnt test like a common diode ? I do remember they rarely went bad. 73 Zeno LFOD ! Quote:
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Audiokarma |
#21
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Still it is not a.bad idea to convert switching time to seconds then take the inverse to get frequency and make sure that frequency is higher than that of the waveform applied.
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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 Last edited by Electronic M; 11-26-2018 at 10:04 AM. |
#22
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#23
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Electronic Memory.
Ive peeled the brown tire off completely. Theres this rubbery kinda pink stuff under it. I imagine that has to go too right? There are no visible signs of conductance on the tire of the fly. There is one tiny spot where one spec of the winding is exposed but I think that only happened peeling the tire off. Of course ive successfully removed the fly cage for cleaning too. I have almost everything short of a fuse and fuse holder I forgot to get when I was in town. |
#24
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That pink stuff is silicone. If it is blackened or loose pull it off, otherwise it is fine to leave it be.
If you exposed the winding then you may want to check continuity before applying fresh silicone... if you somehow nicked a lead open it will be much more of a pain to find and fix after you coat it. BTW if you want to see the process of coating it I have pics of a CTC16 fly I did a few years ago in a thread here on VK. Shango66 on YouTube has some videos of this too.
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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 Last edited by Electronic M; 11-27-2018 at 11:33 AM. |
#25
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All the loose old silicon is gone. So ill look at your thread. Btw I love shango066 s channel. I dont know if this was the source of hissing but the non painted metal shield surrounding the 6el4 shunt regulator, there is a clip to hold the hv leads and theres a "shadow" almost burnt into the metal. As in its really clean were the leads were resting against and browned on the edge. |
Audiokarma |
#26
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#27
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Pretty much.
It is this thread for what it's worth http://videokarma.org/showthread.php...=CTC-16&page=6 Some of the pictures are gone... IIRC I deleted them to make room when my Photobucket filled back before they instituted hosting ransom... Normally I try to preserve resto info I post but the cat I did that work for flaked out on payment he owed and I was a bit angry.
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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 Last edited by Electronic M; 11-27-2018 at 02:47 PM. |
#28
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To be honest im sorta nervous about this. I just really wanna see it work. Ive worked on a zenith bw tv set and successfully restored both my fisher tube receivers. I think im nervous cause its color. I know the silicon isnt really conductive when its wet but it is drying. Will be ready to fire up soon |
#29
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No smoke from the flyback and theres hv |
#30
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*im not sure if the h output tube is shorted.
It got really freaking hot too |
Audiokarma |
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