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Electronic and Radio Related
Slide Charts

RCA Pindex RCA Pindex - 1936
Double sided. Gives pin-outs and tube data for RCA Radiotron vacuum tubes on both sides with instructions on the back.
Printed by Whitehead Hoag.

Size: 6½" X 3"
Larger Photo

W. R. L. Tube Base Calculator W. R. L. Tube Base Calculator - 1944
Gives vacuum tube characteristics and pins for finding tube substitutions. Reversible slide card has tube data on both sides. Chart of tube types on the back. Distributed by Wholesale Radio Laboratories, Council Bluffs, Iowa.
Size: 11" X 4½"
Larger Photo - Front
Larger Photo - Back
Photo - 1945 Envelope with WWII Victory Stamp.

Ohmite Ohms Law Calculator Ohmite Ohms Law Calculator
1941, Double sided. On one side it has scales to compute ohms law along with volts and wattage required up to 1000 ohms. The second side covers the 1000 ohm to 10 megohm ranges. Instructions are printed on each side.

Size: 9¼" X 4+"
Larger Photo

1949 Ohmite Resistance Calculator Ohmite Parallel Resistance Calculator
1949, Double sided. On one side it has several scales to compute Parallel Resistance. It also has a standard slide rule. The other side is an Ohms Law Calculator. Instructions are on slide.
I have two versions of this © 1949 slide card. A cardboard version which has a price of 25 cents and a plastic covered version with a printed price of $2.50. Cardboard version once owned by Elmer Taylor (he printed his name on the slide).
Size: 8¾" X 3"
Larger Photo (cardboard version)

1970 Ohmite Resistance Calculator Ohmite Parallel Resistance Calculator
1970, Double sided. On one side it has several scales to compute Parallel Resistance. It also has a standard slide rule. The other side is an Ohms Law Calculator. Both faces have a clear vinyl cover. Instructions are on slide.

Size: 9" X 3"
Larger Photo

Ohmite Capacitor Calculator Ohmite Capacitor Calculator
1960, Double sided. On one side it has scales to compute frequency with effictive series capacitance, reactance and more. The second side has a range chart with formulas and a standard slide rule. Instructions are printed on the face.

Size: 7¼" X 2¾"
Larger Photo

Resistance Capacitance Calculator Allied Radio Resistance Capacitance Calculator
Double sided and has different ranges on each side.

Size: 12½" X 3½"
Larger Photo
Paper Cover
Instructions
(Adobe PDF File)

Allied Radio Coil Slide Rule Allied Radio Coil Winding Calculator
Double sided. On one side it has several scales to compute coil Inductance and uses coil length, diameter, wire size, turns per inch, etc. The other side calculates R-F Resonance and Ciol Winding. It has scales for frequency/wavelength and Inductance/Capacitance.

Size: 10" X 5"
Larger Photo
Paper Cover
Instructions
(Adobe PDF File)

Ballantine DB - Ratio "The Ballantine Rule" 1953
This slide chart by Ballantine Laboratories has a DB - Ratio conversion scale on one side and a Volts - DB power level converter on the other. The Ballantine Voltmeter Scale Reference card with it has a scale to compare voltage ratio and decibels.
Cards produced by the Perry Graph Corp.
Slide Size: 8½" X 3"
Card Size: 3¾" X 2¼"
Larger Photo
Instructions
(Adobe PDF File)

Amphenol Slide Card Amphenol RF Connector and Cable Selector - 1954
This is a spiral bound, double slide card. There are two cards that are attached like a spiral notebook. One card is a slide chart for selecting the proper Amphenol RF connector and cable, the second card provides a cross reference to RF cable, and cable assemblies.
Card produced by the Perry Graph Corp.

Size: 9½" X 4¼" (closed)

Larger Photo
Photo of second side

Ampex Stereo-Graph Ampex Stereo-Graph - 1959
Ampex Stereo-Graph slide chart of basic control settings for the Ampex 960 Stereophonic Tape Recorder/Reproducer.
Reverse calculates tape playing time by reel size and tape thickness in feet, hours, and minutes.
Card produced by the Perry Graph Corp.

Size: 9¼" X 4"

Larger Photo

GE Range and Signal Strength Calculator GE Range and Signal Strength Calculator - 1952
This General Electric slide chart is double sided with a plastic cover over a cardboard slide card. Front has slide chart for antenna height to key number and reverse has slide chart for megacycles and signal in microvolts along with key number calculated on front.
Card produced by the Perry Graph Corp.

Size: 6½" X 2"

Larger Photo
Photo of storage sleeve

Motorola Zener Diode Calculator Motorola Zener Diode Calculator 1959
This Motorola slide chart calculates volts, amperes, and wattage of Zener Diodes.
Back has a chart for selecting the proper Motorola Zener Diode by nominal/tolerance voltages. Instructions are on paper sleeve.
Card was produced by the Perry Graph Corp.
Size: 12" X 4¾"
Larger Photo
Instructions
(Adobe PDF File)

Shure Reactance Slide Rule Shure Reactance Slide Rules 1942
Here are two slide cards from Sure Brothers Inc.
These double sided slide cards were used to calculate the resonant frequency equation for microphones. On one side they have scales to calculate capacity, inductance, and frequency. The other side has scales for capacitive reactance and inductive reactance.
These cards were produced for Shure by the Perry Graph Corp.

Approx. Size: 8½" X 3½"
Front
Reverse
Instructions
(Adobe PDF File)

Fenwal Thermistor Computer Fenwal Thermistor Computer 1966

Front slide chart calculates resistance at various tempaturer points. Has scales for current, voltage, and resistance ranges.
Reverse side has seven scales bases on resistance teperature curve.
Produced by the Perry Graph Corp.

Approx. Size: 6½" X 9"
Front
Reverse

Great Innovations Engineering Slide Chart Engineering Slide Chart - Current
This Great Innovations' slide chart is a comprehensive Screw Chart that includes technical information from many of the quick references that are commonly found in the work areas of designers, engineers, and machinists. All of this information is compiled for both English and Metric systems in a single screw chart.
More information: engineeringslidechart.com
Approx. Size: 11" X 8 7/8"
Larger Photo

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