#331
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https://www.amazon.com/Craig-Compact.../dp/B00A71YOQI
cheap piece of crap i use for testing. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 the one hooked to my CTC-16 (video input ) for normal playback
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#332
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Quote:
as I am suspecting, this is mainly due to the diff in the test CRT ( 8YP4) and the one the set was made for, 12LP4. And once I do have something built to put this into and mount it safely, the lines should be gone ( I hope ) Typical operation... 12LP4 Anode voltage. 11Kv Grid #2 voltage 250v max circuit value, Grid #1 circuit resistance, 1.5 max meg. 8YP4 Anode voltage. 16Kv Grid #2 voltage 400v Grid #1 circuit resistance, 1.5 max meg. https://frank.pocnet.net/sheets/049/1/12LP4.pdf https://frank.pocnet.net/sheets/049/8/8YP4.pdf The video smearing, as someone pointed out, is most likely peaking coils, but I'm STILL WAITING on the 3 that were sent from Canada on 4/15, ( 2 @ 120 uh , 1 @ 93 uh ), I wonder if they will ever show up now...
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#333
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Do ion traps go bad? ( wear out? )
reason I ask is I have 2, the original one that was with the set, that hardly seems to be magnetic at all anymore, and this NIB one I found off ebay. https://i.ebayimg.com/00/s/MTIwMFgxN..._id=8800005007 which seems to be quite stronger
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#334
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got the ultra cheapo Mega328 LCR-T4 tester today, only took over 3 weeks :/
Very disappointing on how it works. does OK on CAPs and Resistors, but SUCKS on coils, Was way WAY off by over 40% on 2 new coils 240uh and 180uh, but what do you expect for so little $? and the New coils I ordered never showed up. now have try to find something else, somehow...
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#335
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Ion traps can loose their magnetic charge. It isn't common but does happen.
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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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#336
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Trying again :/
trying to get a LCR meter that's a bit better. also trying to get coils again from another source perhaps these wont get lost on the way here 19-4120 - 120 uh Peaking Coil, 12k Shunt x2 however, the orig was on a 22k, meaning I will have to stick a 10k in there to keep the circuit tuned? and again I could only get 1 93 coil :/ 19-4093 - Peaking Coil, 93 uh, 10m No shunt from what I can tell https://imgur.com/0pAv0eh I think I know what coil/coils are bad/ damaged, but have not been able to test/ replace yet that 6.8 k resistor was burned to a crisp, (r141) most likely due to that .05 cap being shorted, the 10uf was WAY over 10uf, but not TOO leaky, but that paper cap had gone to crap.
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#337
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Quote:
https://www.amazon.com/5000-Handheld...8E96AREEHMW2Z2 Better than a inexpensive 328 tester... cheaper than a lab quality bench unit. jr |
#338
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Quote:
https://www.youtube.com/watch?v=piAhl9unCMc
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#339
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USPS track says that the round 2 of the peaking coils will be here midweek.
But I'm still a bit unsure about what to do about the orig 22k shunt vs new 12k. ( it was the only 120mh I could find ) I have not worked much with these type of things, so I'm not sure what to do. Do I stick the new one ( 120mh on 12k ) and see what happens? Or stick it in series with a 10k resistor to try and match the orig 22?
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#340
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Quote:
When you get the coil, if it is physically possible to disconnect one end of the resistor from the coil without mechanically destroying it, you could do that and add a shunt resistor of the specified value. Edit: I think I misread. If you mean adding 10k in series with the 12k (not in series with the whole assembly), that would work too. Similarly, if a peaking coil calls for a shunt resistor but the replacement has none, you can just add a resistor in parallel. Last edited by old_tv_nut; 05-04-2020 at 11:29 AM. |
Audiokarma |
#341
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I messsed up the preceding answer and had to edit it twice!
Please refresh and read the corrected version - sorry! |
#342
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Quote:
https://i.ebayimg.com/images/g/HSkAA...LGB/s-l300.jpg this is not an exact pic, but it gets the idea across
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#343
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Quote:
Interesting. After you posted you ordered one, I checked mine for accuracy against an ordinarily very accurate Sencore Z-meter. I found the capacitance value readings of the 328 very accurate from low values to high value electros. I found the resistance readings excellent except for values under an ohm. Strangely, using a different combinations of the three inputs gives different results on low value resistors. But I found the accuracy of the inductors very close to what the Sencore says they are. The 328 is limited in that it doesn't read below 10uh, but other than that, it was very accurate with inductance compared to the Z-Meter You can try calibrating the 328 tester. Short the three inputs together, then power on. It will calibrate itself and about half way through will ask you to connect a capacitor over .1uf before it finishes. I used a 4uf film capacitor when I calibrated mine and it's pretty accurate. John Edit: I just tried a couple more values. Low value inductors read very accurately, but I just tried a 1mH inductor, and it read 1.02mH on the Sencore, and 1.71mH on the 328. Like yours, not even close, so as far as inductors go, I'd not use this ( I didn't anyway). Resistors over an ohm and capacitors of any value are accurate. I also like how it checks transistors and also automatically identifies polarity and lead configuration. Still, this doesn't make it totally useless on coils. If there are any other coils in the unit of identical or similar value, you can use the results on a "curve" so to speak. . Last edited by JohnCT; 05-04-2020 at 12:18 PM. |
#344
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Quote:
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#345
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2 coils replaced so far, both on the 1st video amp, but no change on the smearing yet, will do the video output next.
But what are the chances this may be caused by the Test CRT? I mean it being JUST different enough to cause slight problems like this?
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