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Steve's Apparatus Design Company
Tube Tester Collection
Apparatus Design Company of Little Rock Arkansas
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Welcome to my Apparatus Design Company collection. This site contains photos, manuals, and information about vacuum tube testers manufactured by the Apparatus Design Company of Little Rock Arkansas in the 1930's.
The Apparatus Design Company was founded in the early 1930's by Jewell R. Williams after he left
Supreme Instruments.
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Jewell R. Williams
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The Apparatus Design Co. (ADC) manufactured several models including the "Confidence" series tube testers, "ADCO" tube tester,
and the "ABC Unameter" below.
Please note:
The data and files contained here are items I have collected from many vintage sources.
There is no guarantee of the accuracy of any information contained on this page. It is
solely up to the end user to decide that the
information and files contained here are accurate and fit for use with their equipment.
I am not responsible for any loss or damages that may be incurred from the use of this information.
 Some files on
this site are in Adobe PDF format. You need Adobe Reader to view Adobe PDF files.
Download it here (free).
When viewing larger photos, you can use your browsers back button to return to the previous page.
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ADCO Tube Tester
This small 3 socket tube tester selected tube settings with a series of short jumpers. The left dial sets the line voltage.
Case measures only 6½"x13"x5½"
Larger Photo
Sorry, no data yet.
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The Confidence Model 36 Tube Tester
Physically the largest of all the testers here, this Confidence Model 36, has one large tube selector in the center, and several controls and
selectors for measuring DC volts, testing vibrators, and testing condensers.
The case measures 11½" wide x 18¼" tall x 6½" deep
Larger Photo
Download:
Confidence Model 36 Manual and Tube Data
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Portable Photo 1
Portable Photo 2
Counter Top Master
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The Confidence Master Tube Tester
The Confidence Master, has four long slide selectors. The far right adjusts the tester for the AC line
voltage and the other three are set for the tube under test using the chart in the cover.
These are AC powered testers and have the early Edison lamp socket connection instead of a two prong plug.
I have both a portable and a Master in it's original art decco style cabinet for use on a radio store counter.
Download: Confidence Master Instructions and Tube Data
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The ABC Unameter Tube Tester
Another unique tube tester.
Unlike the Confidance testers above that have one or more dial selecters, this Apparatus
Design Co. tube tester like the Confidance Master, has four long slide selectors. The far right adjusts the tester for the AC line
voltage and the other three are set for the tube under test using the chart in the cover.
The case is long compaired to the width of the tester and measures 17½" x 9¾" x 5½"
Larger Photo
Download: ABC Instructions and Data Sheet
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The Confidence Royal Tube Tester
This Apparatus Design Co. tube tester like the Confidence Master and the ABC Unameter, has three long slide selectors.
This might be the latest ADC tester in my collection as the faceplate and data sheet lists the Apparatus Design Company as a Chicago U.S.A. location, not Little Rock Arkansas.
Larger Photo
Face Photo
Download: Royal Instructions and Data Sheet
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Apparatus Design Company
Burton Webber
Four Page Catalog
View Catalog
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More Apparatus Design Company items
posted as I acquire them.
If you have any ADC or ADCO tube testers, data sheets, manuals,
catalogs, or schematics for sale that are not listed here please contact me.
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