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Old 25th December 2011, 04:57 AM   #1
dgta is offline dgta  United States
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Default Hickok 752A calibration?

Does anyone have a calibration writeup for this tube tester? I do have the manual but it has nothing about calibration. A web search yielded nothing. Was there a separate service manual with this info? Thanks.
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Old 25th December 2011, 06:38 PM   #2
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To my knowledge there is no written calibration procedure by Hickok for the 752A. Calibration was set during manufacture by the use of mostly fixed resistors just like the 539 series. A "standard test tube", usually a 6L6, is used to verify accuracy.

However, a fellow named Daniel Schoo has written articals about calibrating Hickok tube testers. You can find them on line by searching his name. A good write-up was made available through Audioxpress on their website as a free download. It was for the 539C, but the basic principals can be applied to yours.

Also see:
http://bellsouthpwp.net/p/a/padgett46/cal539c.htm

http://books.google.com/books?id=FaF...0schoo&f=false

http://www.desmith.net/NMdS/Electron...ion%20V4.1.pdf
Attached Files
File Type: pdf Hickok 539C Calibration V4.0.pdf (73.9 KB, 67 views)
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Last edited by HollowState; 25th December 2011 at 06:57 PM.
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Old 26th December 2011, 03:04 PM   #3
dgta is offline dgta  United States
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Thanks Hollow. Good reading.

It looks like Daniel Schoo wrote an article in Audio Xpress about calibration of Hickok testers, somewhere around July-August 2007. Can't find it for download on their website. Does anyone have a copy or link to it?

EDIT: The article IS listed (8/07) but won't download. Anybody have a copy?

http://www.audioamateur.com/ax-supplemental.html

Last edited by dgta; 26th December 2011 at 03:10 PM.
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Old 26th December 2011, 04:25 PM   #4
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The PDF attachment that I posted was from AudioXpress.
Untitled Document Scroll down to 8/07 area
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Old 26th December 2011, 05:39 PM   #5
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There is a calibration manual offered at ePay: HICKOK 752 752A TUBE TESTER CALIBRATION MANUAL. VERY RARE! FIRST TIME AVAILABLE! | eBay .
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Old 26th December 2011, 10:19 PM   #6
dgta is offline dgta  United States
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Thanks Hollow, I didn't realize your pdf was the actual article. I did scroll down to it on their site but it wouldn't download. Just took me to a useless page when I clicked on it.

Joshua, did you actually get that manual? Looks suspicious. Hard to believe he's the only person in the world with a copy of the manual and then he "re-typed it" ???? Why? Why not just sell copies of the real thing? Sounds fake.
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Old 26th December 2011, 11:39 PM   #7
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Quote:
Originally Posted by dgta View Post
Hard to believe he's the only person in the world with a copy of the manual and then he "re-typed it" ???? Why? Why not just sell copies of the real thing? Sounds fake.
It may be a legal thing. If it's a Government document perhaps reproducing it directly may not be a good idea, even if they don't really care. I've never heard of it until now. But I don't need it either. The Schoo artical is enough. And yes, the AudioXpress website isn't working right now. The PDF I posted I had saved in "my documents" some time ago.
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Old 27th December 2011, 02:50 AM   #8
dgta is offline dgta  United States
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I can buy the legal theory, not sure I'm ready to buy the idea that he's the only one in the world with a 752 calibration manual. I'd want to see proof that there actually is such thing as a calibration manual from Hickok, not something written by someone else.

And yes, with Schoo's article and a little tracing through the schematic I think we have enough to make sense of it. Thanks. But I wouldn't mind paying for a factory manual if I knew it was genuine.
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Old 27th December 2011, 03:12 AM   #9
GloBug is offline GloBug  Canada
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That eBayer has sold a few copies with good feedback. Might be worth a shot.
For $30, I can see why your hesitant.
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Old 27th December 2011, 10:33 AM   #10
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New member to DIY, and thought I might comment about the post. I personally know that Hickok did make certain manuals for the 752/752A that contained the above mentioned calibration/troubleshooting info. Since the 752/752A was used by the FAA, Hickok did supply the Feds with the info. I would also agree with HollowState about copying Government documents and offering them for sale. As far as the only one in the world with a copy, not likely!
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