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 Post subject: HICKOK AC-51 TESTER
PostPosted: Nov Fri 02, 2018 3:08 am 
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Joined: Dec Mon 02, 2013 7:00 pm
Posts: 191
Location: Calgary, AB
Okay - just making an inquiry about this Tester I acquired - what do you experts "recommend" to get this baby up & running in order to get my old radio tubes checked out??? What should I look for; task(s) to perform first etc. etc. Thank you for your assistance. I already have a Schematic. Thanks Steven!!!

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 Post subject: Re: HICKOK AC-51 TESTER
PostPosted: Nov Fri 02, 2018 8:16 pm 
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Joined: Nov Wed 30, 2016 7:35 pm
Posts: 2332
Location: Sunbury, Ohio 43074
Post a few photos, at least one of the outside and a few of the inside, so we can get a rough idea what shape it is in. Have you tried to use it yet?

Also need to know the history of the tester... was it in use, or sitting in a damp basement for 40 years. Or something in between.

Only when some background information is known can you receive enlightenment :) And at that point, you'll get a lot of help most likely.

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 Post subject: Re: HICKOK AC-51 TESTER
PostPosted: Nov Fri 02, 2018 8:30 pm 
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Joined: Feb Wed 17, 2016 6:51 pm
Posts: 70
^^^ Agree with above, take a bunch of high-res photos inside and out, and you'll get all the info you need. Most likely just clean it up, clean the switches, and change capacitors. But that may have been done already, or maybe it needs more than just that.


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 Post subject: Re: HICKOK AC-51 TESTER
PostPosted: Nov Fri 02, 2018 8:34 pm 
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Joined: Dec Tue 01, 2015 5:31 am
Posts: 1746
Location: Columbus Ohio
These aren't complicated like a 539c, appears to have 1 cap, for the shorts test, to the neon bulb.
I'd open it up and check for safe operation, power cord, fried resistors. Change out the .1 cap regardless.
You can check resistor values, in circuit, providing the switch to it is in open position for that circuit, else your reading will be way off.
Then attach a 100ft extension cord and plug it in from afar. just kidding, it will be fine after a decent inspection.
schematic link: https://stevenjohnson.com/hickok/data/h ... 1-schm.pdf

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 Post subject: Re: HICKOK AC-51 TESTER
PostPosted: Nov Fri 02, 2018 11:25 pm 
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Joined: Jun Fri 19, 2009 6:34 pm
Posts: 8002
Location: Long Island
As long as the power transformer and meter are in good shape, there is very little to go wrong with these testers. You'll probably want to clean the switch and tube socket contacts with a good grade of contact cleaner like DeOxIt, check the tubes, and replace the line cord. The 0.1-uF cap probably needs to be replaced; if it is leaky or open the shorts indicator won't work right.

One thing to be aware of is, the 83 tube is a mercury vapor type and if it sat around unused a long time, it should be allowed to warm up for five to ten minutes with the filaments energized before testing any tubes. The tube may suffer a potentially harmful flash-over if this precaution isn't followed.

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