Make
Robyn
Model
T-123B
Made in
Japan
Mfg. #
5001Z
Year
1972-1976
Channels
23
Power Output
5 watts
Power Input
12VDC, 115VAC
Dimensions
12 x 5 x 8-1/4 inches
Weight
17 lbs
notes
11 Tube, 2 Transistors.
Tube Complement
| v1 | RF amp / 1st mixer |
6BL8 |
| v2 | 2nd Mixer / 2nd Osc |
6BL8 |
| v3 | IF Amp (455 kHz) |
6BA6 |
| v4 | IF Amp (455 kHz) |
6BA6 |
| v5 | 1st Audio / Modulator / Mic Preamp |
12AX7 |
| v6 | RF amp / 1st mixer |
6BQ5 |
| v7 | Local Osc |
6GH8 |
| v8 | Converter / 1st Osc |
6GH8 |
| v9 | Buffer Amp |
6BA6 |
| v10 | RF Power Amp |
6BQ5 |
| v11 | Buffer Synthesizer |
12AT7 |
Documents
Operator Manual - robyn_t123b.pdf
Schematic - robyn_t123b_om_sch.pdf
Overview
The Robyn T-123B is a 23-channel CB transceiver produced during the early 1970s. It is a crystal-controlled AM radio designed for reliable communication during the early expansion of the CB service in the United States. The unit supports both base and mobile use through wiring-based power configuration.
Technical Specifications
| Specification | Details |
|---|---|
| Channels | 23 channels (crystal controlled) |
| Frequency Range | 26.965 MHz to 27.255 MHz |
| Modulation | AM |
| Power Requirements | 115 V AC or 12 V DC (wired configuration) |
| Receiver Type | Superheterodyne |
| Channel Control | Crystal-controlled (plug-in crystals required) |
| Controls | Volume, Squelch, Channel Selector |
| Metering | Signal strength meter |
| Connectors | Microphone, antenna, external speaker |
Physical Description
The radio is housed in a metal cabinet with a front-facing speaker and a straightforward control layout. The front panel includes a rotary channel selector, analog signal meter, and controls for volume and squelch. A microphone connector is mounted on the front panel. The design reflects typical early 1970s CB equipment with an emphasis on durability and simple operation.
History
The Robyn T-123B was introduced during the early CB radio boom when crystal-controlled radios were standard. Each channel required a dedicated crystal, providing stable frequency operation but limiting flexibility.
Robyn radios were marketed in the United States and typically manufactured by Japanese OEM suppliers. The T-123B represents a transitional period before PLL-synthesized channel selection became standard. Its dual power capability, implemented through wiring rather than a switch, allowed use in both base and mobile installations.
References
