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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Aug Fri 01, 2014 7:39 am 
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easyrider8 wrote:
anchorman

Do a search on this forum and you will find many test results after going solid state, some tubes read higher, some lower.

Dave


Hi dave,

I've read about every post on this that I could find, and saw mixed results. This particular design for the 83 looked promising, though. I think regarldess of whether the results shift a bit, that I'm going to be fine with the results. I don't throw away weak tubes, since they are a finite resource, and will still work fine in many instances, but the tube tester working any which way is going to still sort the wheat from the chaff, so to speak. I'm concerned with keeping the insides of the unit cooler, and happier. Tubes are easy to replace, but the guts of a TV-7 are not!

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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Aug Fri 01, 2014 2:37 pm 
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Location: Pocasset, Cape Cod, MA
Quote:
what tek curve tracer are you using to get 1600V PIV test?
I think it was the 576, but at one point I also had a Systron-Donner tracer that I've since sold.


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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Aug Fri 01, 2014 7:25 pm 
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anchorman said:
Quote:
I'm concerned with keeping the insides of the unit cooler, and happier. Tubes are easy to replace, but the guts of a TV-7 are not!

That applies to any tube tester I have heard of, that is why when I got my one-and-only tube tester (Precision Apparatus 612, emission tester) that I added a small fan.
The fan is just for circulation inside the case, it does not move air in and out of the case. With a wood case, about all the heat has to go out by conduction through the metal front panel. I directed the fan toward the Line Adjust wire-wound pot to keep it from having a hot spot and it moves air past the 5Y3 (only tube) also.
So now the tester has a slight hum when it is on.

The fan is an interesting item, a surplus piece I had for years wondering what would be good to use it on, it has only one blade and does not spin. It is a piezo-electric 'bender' (like Patent 4,498,851) so the one blade flaps at line frequency, using very little current.


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File comment: Patent
Solid_state_blower.pdf [255.25 KiB]
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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Mon 15, 2018 4:19 am 
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I know this thread is old, but I want to build the calibrator shown in one of the previous posts. However, I want to be sure I wire it correctly so as to avoid destroying the calibrator or my tube tester. The schematic shows several places where wires cross, but it does not indicate if there are connections there or not. I've slightly modified the schematic to show what I think are the correct places for connections (see attached modified schematic). I'm hoping there is someone out there who can tell me if I am correct. Thanks.


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GM Calibrator Revised.pdf [70.57 KiB]
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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Mon 15, 2018 6:03 am 
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AA6U wrote:
I'm hoping there is someone out there who can tell me if I am correct. Thanks.

No, you're not correct. The three wire-crossings that you amended to jump-overs are instead supposed to be connected. Place a dot at the two crossings but not at the transistor. The transistor doesn't get a dot, as the connection is part of the symbol.

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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Mon 15, 2018 7:16 am 
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Is this correct now?


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GM Calibrator Revised 2.pdf [69.82 KiB]
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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Mon 15, 2018 7:32 am 
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I looked up a schematic of the transistor and see that the K and the lower part are connected internally so the jumper I have indicated above the "K" is not correct.

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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Mon 15, 2018 4:42 pm 
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I'll contact the fellow that originally built that circuit and ask him to clarify.

http://www.antiqueradios.com/forums/viewtopic.php?f=8&t=181387


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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Mon 15, 2018 5:23 pm 
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The schematic was updated in another post somewhere, it is done in MS paint so somewhat crude. I also have a larger PDF file with the article on the initial design, send me a PM with email and I can send it to you.

I have used the SS 83 and 5Y3 with no difficulties or significant change in accuracy in the 539B/C and has also been tried in multiple other Hickok's tube testers with similar results. Seems like a number of vendors have copied the design and are selling it through various sites. Be aware, that these tube testers were never designed to be laboratory standards, and new tubes may vary by more than 20% tube to tube.


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Transconductance Tube Tester Standard Modified Circuit.jpg
Transconductance Tube Tester Standard Modified Circuit.jpg [ 140.13 KiB | Viewed 567 times ]
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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Mon 15, 2018 5:31 pm 
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Thank you mksj for the clarification. I've seen the updated version before but was not having much luck locating it.

In addition, using the s/s 5y3 and 83, my 539 is good. As you have stated, it's close enough.


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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Mon 15, 2018 7:04 pm 
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Gentlemen, your assistance is much appreciated. I know from experience how much two calibrated models of the same tube tester will vary in testing the same tube. At least this gets you in the ball park regarding the tester's accuracy.

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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Tue 16, 2018 1:20 pm 
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If someone could PM me the schematic of the calibrator, with any notes, I will be glad to do it over in CAD and post it as either CAD or PDF for anyone to follow. I'll also build one for myself :) If all else fails, MAIL me a hand written version. Postage stamps, you know ;-)

Thanks, let me know
Barry

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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Tue 16, 2018 7:15 pm 
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I got the schematic, will CAD it and post a PDF this evening and invite all comments, changes, corrections, then I'll correct/udpate as necessary and post a final when everyone weighs in

b

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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Wed 17, 2018 3:10 pm 
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calibrator schematic.... comments welcome, still a work in progress. I"ll update and repost after any responses


Attachments:
6SN7 TUBE TESTER CALIBRATOR.pdf [49.72 KiB]
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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Wed 17, 2018 4:45 pm 
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Beautiful! A work of art!

The only suggestion I have is to label "Plate", "Grid" and "Cathode" to the left of the circled 4,5, and 6 labels on the schematic and to put "Filament" above the circled 7 and 8 labels.

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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Wed 17, 2018 4:56 pm 
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S1A has an issue.

I'd recommend just making R3/R4 into one resistor and then note that multiple resistors can be used.


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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Wed 17, 2018 5:13 pm 
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Also, I think mksj should be credited for that circuit.


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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Wed 17, 2018 5:50 pm 
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Thanks for the comments, all noted. And yes if mksj wants to be credited it will happen. It is his design. I am in communication with him as well.

keep those cards and letters coming folks.

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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Thu 18, 2018 2:11 pm 
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UPDATED SCHEMATIC and DRAWING. Thanks to all for your suggestions, and to mksj for the Mouser part numbers. That would have probably held me up for days just thinking about looking them all up.

More comments still welcome; I can always update it again

Now .... does anyone (much smarter than me) .. yea I know that covers a lot of ground ... have a version of this for, say, a 6L6 and a 12AX7? That would kind of be a "super standard" to check your calibration. Maybe after that we can get into mercury vapor tubes ;-D

bb


Attachments:
6SN7 TUBE TESTER CALIBRATOR.pdf [68.79 KiB]
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 Post subject: Re: Updated Hickok 539 Calibration document
PostPosted: Jan Thu 18, 2018 5:01 pm 
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That would be a good idea, although the 6SN7 is a triode like the 12AX7, so they would likely be similar. My wish list would include an added higher GM measurement setting like 8000 GM or 10,000 GM to better calibrate higher ranges found on some tube testers.

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