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Zenith 5-S-29

Don Bosco Electronics
The Stethotracer and Mosquito

In the 1960s Don Bosco Electronics Inc. manufactured pen sized signal
tracers and signal injectors engineers could carry around in a shirt pocket.

Don Bosco Sales Brochure Don Bosco Electronics Sales Brochure
This 1960s Don Bosco sales brochure contains information and specifications on the Universal Laboratory Set model PHD-100, the Stethotracer, Stethotracer Transducers and Accessories, the Vibrotracer model VT-170, and the Mosquito Signal Injector. The brochure also includes pricing. See price table below.

Download 6 pages, (Adobe PDF File)

Stethotracer - Signal Tracer

The Stethotracer is a pen sized, self contained signal tracer. It is used to locate and troubleshoot circuits in all types of radios, amplifiers, phonographs, PA systems, telephones, TV audio circuits, tape machines, hearing aids, and more.

ST-111 Stethotracer kit
ST-111 Stethotracer kit
ST-111 Stethotracer kit includes:
  • Stethotracer w/earphone
  • 4 Probes - 0db, 20db, 40db, RF
  • Ground Clip Lead
  • Battery (1.5V AAA)
  • Operation Drawing
  • Instruction Manual
  • Warranty Registration Card
Both Stethotracer ST-111 kits I have are in plastic boxes (see photo above). The pieces are held in place with elastic cords and accessories are in a plastic bag underneath. Both kits contained a layer of gray foam which has disintegrated over the years.

Literature in the first kit contained what I assume to be the original address of Littell Road or 56 Route 10, Hanover NJ. The second kit in some instances had the Hanover address crossed out and a new address of 95 Brewery Road, New City, NY printed or stamped on it. A 1974 catalog I have is printed with 325 Broad St., Bridgeport, Conn. crossed out and ink stamped with the New City, NY address. I also have a packing slip for a Mosquito dated 7/11/1962 using PO Box 323 Hanover NJ.

Stethotracer Operation Drawings
Stethotracer Operation Drawing

Stethotracer Operation Drawing - Later

Stethotracer Instruction Manual 14 pages
Stethotracer Instruction Manual
(Adobe PDF File)

Stethotracer - Universal Transducer Set PHD-100-A



The Mosquito Signal Injector
The Mosquito Signal Injector was designed to troubleshoot tube and transistor circuits. It produces
a 1,000 to 2,000 cycle square wave at an audio level and is powered by a single AAA 1.5 V battery.

Mosquito - Signal Injector
Mosquito - Signal Injector

Mosquito Signal Injector

Mosquito Box and Case
Mosquito, Box, and Case
Mosquito Operation Drawing
Mosquito Operation Drawing - Larger

Westinghouse Tech-Lit News Signal Tracing In Transistor Radios
This February 1959 Westinghouse article discusses the use of the Don Bosco Mosquito for tracing signals in transistor radios making this the earliest reference I know of for a Don Bosco product.

Price List:
ST-111 Stethotracer   $34.95 $57.50
PHD-100 Universal Laboratory Set   $34.95 $149.95
PHD-100A Universal Transducer Set   $180.00 $270.00
SA-112 Vibration Pickup $24.95 $29.95 $52.50
SA-113 Output Adapter $4.95 $7.95 $14.00
SA-114 RF-Microwave Demodulator $34.95 $39.95 $69.95
SA-115 Magnetic Tape Head $19.95 $24.95 $43.50
SA-116 Miniature Microphone $19.95 $29.95 $52.50
SA-117 Input Adapter $6.50 $7.50 $13.30
SA-118 Telephone Pick Up $5.95    
SA-119 Inductive Detector   $22.50 $39.50
SA-120 Photovoltaic Detector   $29.95 $52.50
SA-121 N Connector Adapter   $8.95 $15.75
SA-122 BNC Connector Adapter   $5.50 $9.75
SA-123 RF-Detector & Adapters   $52.00  
VT-170 Vibrotracer   $59.50 $89.50
Mosquito Signal Source   $9.95 $19.95

WANTED - Don Bosco equipment

  • Vibrotracer model VT-170
  • Manuals or Sales Flyers
If you have any of the Don Bosco equipment in good condition that's listed above and you are looking to sell, please contact me. Include photos and description of condition in any emails.


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