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[Restoration]- 1960's Multimeter! Sentinel ME-26D/U

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johnlsenchak:
[Restoration]- 1960's Multimeter! Sentinel ME-26D/U
Mr Carlson's Lab
Published on Jun 18, 2019
Sharing more electronic knowledge! Here is a ton of information about electronic repair, restoration, and alignment. See the Carlson Low Voltage Leakage Tester in a comparison test too. Also.. See the "NEW" Carlson Non Contact Signal Injection Probe in action as well. Lots of info here... Enjoy!


Posted   06/19/2019

Dr. Frank:
Mr. Carlson delivers very polished videos, which I usually really appreciate, as he has a lot of knowledge about vacuum tube devices.

But he also polishes the YT comments, i.e. he blanks / censors unwanted negative comments. This I really dislike.

So here is a copy of my three times blanked out comment about his latest repair video, in which he really has very little clue about the subject.

'Sorry, that repair / DC range calibration was not done  in a qualified manner.
E.g., it was not necessary at all to replace that nominal 22M, 10% resistor inside the DC probe, as its drift is exactly compensated by  this 1V range trimmer alignment. In fact its value or its drift has practically no influence on either DCV range. This is evident, because the change from 26 to 22 MOhm did not change the alignment of the 1V range at all.
Also, the replacement of the other range resistors could have been done in a more clever way, e.g. it is necessary to trim only one resistor to get this upper 68.3M resistor, instead of replacing both. It's missing also the important information, which type of resistors you've used as replacement. So did you use modern 1% thin film resistors, or crappy/unstable carbon resistors out of your junk box?
Back then, in the Airforce cal lab, I repaired lots and lots of these hp410Bs, so I really can't appreciate your repair methods.'

johnlsenchak:

--- Quote from: Dr. Frank on June 20, 2019, 03:49:11 pm ---Mr. Carlson delivers very polished videos, which I usually really appreciate, as he has a lot of knowledge about vacuum tube devices.

But he also polishes the YT comments, i.e. he blanks / censors unwanted negative comments. This I really dislike.

So here is a copy of my three times blanked out comment about his latest repair video, in which he really has very little clue about the subject.



--- End quote ---

Unfortunately, most but not all  Youtube  Content  Creator  are doing this  because their is a huge  amount  of negativity  within the comment  sections  To  much  negative  or childish   crap and not enough constructive  comments    I  think  Mr Carson   talks  way to much and should edit down his videos  for time. Two hours  is way to long  for a  video because people now and days  don't have  the attention  span

schmitt trigger:
+1 What John said.

The modern man's disease is the lack of time. When we  have some free time in which we would like to be entertained, while simultaneously learning a little bit (a weird activity that us engineers like to do), we seldom have the luxury of watching an hour-long or more video.

That is the reason I like Dave video's so much. A little introductory banter and then he dives right in, and limiting the video between 20 to 30 minutes. If the topic is extensive, then he can always do a part 2 video.

chris_leyson:
It was an interesting repair video but way too long and I think 25% of it was devoted to advertising his Patrion channel and his capacitor leakage tester. EDIT: It can't be too difficult making the leakage current sense resistors an order or two larger in magnitude to increase the sensitivity.

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