National CRM

Uses a 1" 913 CRT for display. This line of National scopes were intended for use by radio operators, they were used to monitor modulation and have only minimal components as shown in schematic. Time base for horizontal sweep was derived from the AC power line at a 60 cycle rate or an from external signal. List price was $18.50 less tubes, see ad here.

National CRU

Uses a 2" 2AP1 CRT for display. As in the model CRM the unit has only two tubes, the CRT and a rectifier. List price was $32.50 less tubes.

National CRR (?)

Not really sure if it is a National piece or a copy. It has no ID plate or markings anywhere, other than the engraved knob labels on the panel. It uses a 2" 2AP1 CRT for display and a 6X5 rectifier rounds out the tube complement.

RCA Model 151 

Uses a 1" 913 CRT for display. This scope was introduced around 1936 at cost of $47.50, by 1938 the cost was 39.95. These prices included tubes, see ad here.

RCA Model 151-2

Uses a 2" 2AP1 for display. This model is identical to the model 151 except that a 2AP1 CRT was shoehorned into the box, the tube had to be installed at an upward angle to fit in the shallow cabinet.  This scope was introduced around 1938 at a cost of $49.95

Deforest's Training Inc.

This scope was used as part of a training course. Possibly from the original DeVry Institute which was started in 1931 as the DeForest Training School, as the name on the unit doesn't quite match, I can't say for sure. No cabinet, click here for a side view.

UTL Model E

This scope was used as a training project for students enrolled in the United Television Laboratories School. The school started off in the 1940’s as United Television Laboratories aimed at TV repair following the WWII boom. later in the 50’s they changed their name to United Electronics Laboratories, and by the early 60’s became United Electronics Institute. By the 1980's they were gone. The cabinet is home made, it uses a 2" 2AP1 CRT, has vertical and horizontal amplifiers, and linear sweep generator.

Homemade

Uses a 1" 913 CRT, probably dates from late 30's. Direct connection to the deflection plates, probably used in a HAM shack as modulation monitor. Well constructed cabinet made up of 7 pieces all screwed together. Circuitry very similar to the National CRM above.

Homemade

This one uses a 2" 2AP1 CRT. It is very crudely built as can be seen in the photograph below. It is a true scope as it has a 884 tube to generate the linear sweep.

Supreme Model 530

Uses a 2" DuMont 24-XH CRT for display. Typical of early Supreme equipment, this is housed in a dovetailed, quartersawn oak cabinet. Very primitive set, has only 2 tubes, besides the CRT. A 5T4 rectifier and a 6J7 vertical amplifier. Sweep is either external or internal 60cycle

Supreme Model 535

Uses a 2" 2AP1 CRT for display. Typical of early Supreme equipment, this is housed in a dovetailed, quartersawn oak cabinet. This updated model has vertical and horizontal amplifiers, and a real horizontal sweep generated by a 884 tube. Original cost was $49.95

Supreme Model 546

Uses a 3" 906 CRT for display. Typical of early Supreme equipment, this is housed in a dovetailed, quartersawn oak cabinet and a highly nickel plated chassis shown below.  This early version dates from around 1938.

Clough-Brengle Model CRA

Uses a 3" 906 CRT. In 1935 this set cost $79.50, increasing to $84.50 in 1936.

Supreme Model 546-A

A later version of the Model 546 line of scopes, electrically it is identical to the earlier versions. This model has a metal cabinet and the chassis is painted wrinkle black.

Supreme Model 560A

The Vedolyzer uses a 2" 2AP1 CRT for display. This device was called a "Complete Dynamic Analyzer", it consisted of a oscillograph, vacuum tube voltmeter, dynamic signal tracer, multimeter, and a wavemeter all in one 35 lb. package.

Philco Model 7019

Uses a 2" 2AP1 CRT for display. Also known as the "Junior Scope", small and lightweight it sold for $66. This set is very similar to the Waterman scope. Click here to see ad.

RCA Model WO-57A

Uses a 3" 3MP1 CRT for display. This CRT is very short about the same as a 2AP1, this allows the 3" scope to be housed in a case not much deeper than the Model 151 shown above. This set is from the early 1950's

Clough-Brengle Model 126

This set uses a 3" 906 CRT for display. This is very similar to the Model 126A shown below. This model was produced in late 1937, see packing list.

Clough-Brengle Model 105

Uses a 1" 913 CRT. In 1935 this set cost $48.50.

Clough-Brengle Model 126A

This set uses a 3" 908 CRT for display. The 908 is the same as the 906 except it has a P5 phosphor. This is a blue trace with a very fast decay time used for photography applications.

Blue trace of the P5 phosphor.

General Electric Model CRO-3A

Uses a 3" 3AP1 CRT. Circa late 40's early 50's

RCA Model 155

Uses a 3" 3AP1 CRT, uses same internal components as the Model 151. This scope was introduced around 1938 at a cost of $63.95, included tubes.

DuMont Model 164

Uses a 3" 3AP1 CRT. The internal components have been coated with a sealer, typical of what you find in military gear that was to be used in areas of high humidity. A label dates that the coating was applied in August 1945.

DayRad 65

Uses a 3" 906 CRT. In addition to being a general purpose oscilloscope this unit contains a wobbulator, a motor driven sweep generator, to do sweep alignment of equipment.  

Bendix Model 160

Has a built in sweep generator centered at 1Mhz, sweep width of +/- 15Khz. The center frequency can be shifted up or down by connecting a signal generator to the bottom terminal posts and tuning it to the desired center frequency.

9Z4P1 / K1207 - 9" CRT

This large CRT contains five independent electron gun assemblies, each gun has its four deflection plates brought out around the neck of the tube. I did find a mention of this tube used in a high speed display unit used by NASA for radio astronomy.

Close up of the 5 electron guns

The dual set of pins on base

Size comparison, the tube in front is a 3AP1

Weston Model 788

Also known as OQ-3 in the Naval version. To test tubes, individual jumpers are connected between the tube socket panel and the tester panel

Triplett Model 1610

 "Robot" tube tester.

Sterling Model R-402

A battery operated tester for early battery tubes like the 201 or 199.

Supreme Model 35

Original cost was $29.95

Sterling Model R-404

An early tester used to rejuvenate the filaments on tired tubes and test filament emission.  Rejuvenating the filament was used only on thoriated filament tubes. Click here to read the instruction manual and why rejuvenation is possible.

Supreme Model 89 Deluxe

This one is housed in a portable case with lid. Also had the capability to test capacitors.

Supreme Model 89 Deluxe

This one housed in a slant front bench case. Original cost was $45.95

Stark Model 911

Basic emission tester. Nothing really special about this unit, I just liked the color combination with the bright red sockets, knobs and meter.

Triplett Model 1213

Another basic emission tester, small portable unit, circa late 1930's.

Philco Model 7053

CRT tester, this tester can test magnetic deflected CRT's such as 10BP4, as well as electrostatic deflected like the 7JP4. It is just a simple emission test with results shown on the neon bulb. The cables are stored in the pull down door.

Transvision Component Tester

I know virtually nothing about it. Apparently in addition to testing CRT's it will also test flyback transformers, and selenium rectifiers and rejuvenate cathode of the CRT.

Oak Ridge Products

CRT tester. Another test unit I know nothing about. Apparently it was connected in line with an active CRT and tested the CRT under operating conditions. It also included a 500v and 15KV voltmeter.

Meissner Analyst

A multipurpose tool for the service technician has the following functions:
An audio amplifier with phone jack output
An AC voltmeter with range of 0.1 to 1000 volts
A DC voltmeter with a range of 0 to 500 volts
A frequency meter with
   Vacuum-tube voltmeter with a range of .05 to 50 volts
   Measuring frequency from 600KC to 15MC
A TRF tuner with phone jack output with
   Vacuum-tube voltmeter with range of 50 microvolts to 50 volts
   Measuring frequency from 100KC to 1700KC
A line-current ammeter

Original cost $113.85, catalog ad

For the operating manual in PDF format, click here.

Hickok OS-10

RF generator and AC meter.

Jackson 650A

Capacitor tester. It has a test range of 10pf to 1000uf, up to 500 volts. Surprisingly it is very accurate, I  checked it against my Sencore Z-Meter and found the results virtually identical.

Hickok Test Bench

This bench unit contains a Model 177X Signal Generator, a Model 510X Mutual Conductance Multi Tester, and a Model TS-50 Universal Test Speaker, two electrical outlets, a patch panel, lights built into the top overhang to light up the work bench.

Hickok Model 177X

Signal generator.

Hickok Model 510X

A multi-purpose device. A mutual conductance tube tester, DC voltmeter, AC voltmeter, Ohmmeter, and capacitor tester.

Hickok Model TS-50

Universal Test Speaker