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MeasurementBlues
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Re: Learning from old designs
MeasurementBlues   12/23/2013 2:08:39 PM
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Dave's videos are fun to watch. Mine are somethat leff frequency and more subdued. That reminds me, I do have a product review to do. Mayne after the holidays.

DarkMatter0
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Learning from old designs
DarkMatter0   12/23/2013 1:49:37 PM
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Check out Dave Jones' excellent tear-down and design analysis of a Fluke 5450A Resistance Calibrator:

http://www.eevblog.com/2013/11/06/eevblog-544-fluke-5450a-resistance-calibrator-teardown/

Also check out his most-excellent rant in reply to a wet-behind-the-ears viewer who commented that there was nothing to be learned from examining "old" equipment designs:

http://www.eevblog.com/2013/11/07/eevblog-545-vintage-design-rant/

 

 

MeasurementBlues
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Re: old equipment
MeasurementBlues   12/23/2013 12:51:31 PM
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@Etmax,

Yes, digital calibration and adjustment has certainly cut down on drift. There will always be some. that and the quality requirements keep calibration technicians employed.

Etmax
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Re: old equipment
Etmax   12/22/2013 4:38:33 AM
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I worked on a lot of old equipment, and it all had the same problem, it was unreliable, drifted like crazy and NEDED calibration to attain what are now considered mediocre specs. These days any voltmeter from a company like Fluke etc. that is ~1% accurate usually doesn't need calibration, we just do it because the standards say so. Get to 0.1% and you occassionally need calibration. Things sure have improved

MeasurementBlues
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Re: Fascinating stuff.....
MeasurementBlues   12/22/2013 12:36:59 AM
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@Etmax, thetubestore.com lists tube manufacturers.

MeasurementBlues
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Re: Not a CRT?
MeasurementBlues   12/22/2013 12:32:36 AM
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@Jeffl_2

As I recall, it was in fact a CRT.

>The caption says there's a CRT in the upper right corner of the capacitance bridge panel in image 13, but is it really?

JeffL_2
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Not a CRT?
JeffL_2   12/21/2013 10:07:27 PM
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The caption says there's a CRT in the upper right corner of the capacitance bridge panel in image 13, but is it really? I have a hunch it's just a little screen over the top of a 6E5 "magic eye" tube but I could be wrong, those were quite common on test equipment of that vintage and function. Basically it's a replacement for a meter when all you needed was an indication of an analog null condition, like showing that the bridge was properly in balance.

Etmax
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Re: Fascinating stuff.....
Etmax   12/20/2013 8:45:19 PM
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There's a few Russian companies that manufacture vacuum tubes, some even make them to order. A friend of mine wanted to make a valve amplifier that actually produced high quality audio and designed a valve that met hit criteria. He's using one of these companies to make it :-)

David Ashton
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Indestructible test gear
David Ashton   12/19/2013 10:46:51 PM
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The old HP test equipment was pretty long lived as well, there are some legendary stories about it.  My favourite is here

http://users.monash.edu.au/~ralphk/hp-counter.html

I've posted this before so apologies to those who may have seen it before.

 

MeasurementBlues
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Re: What about the staff?
MeasurementBlues   12/18/2013 4:16:11 PM
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@prabhakar_deosthali, that may be the one thing that puts a company like IET out of business. Everyione who works there is an expert at his or her job and has been doing it for many years. When they reture, who will replace them?

There's another issue and that is because these people have a unique skill that's not necessarily transferable to other jobs. Thus, they have a job for life as long as the company stays in business, but there's little room for advancement or for changing jobs.

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