Sommerkamp Ft 250 File

It is a hybrid. The receiver and transmitter audio sections use 16 tubes for that classic warm sound, while the VFO uses transistors for frequency stability.

| Part | Replacement / Source | |------|----------------------| | Final transistor | 2SC1969, 2SC1307 (eBay, RF Parts Co.) | | Driver transistor | 2SC1945 (or 2SC1971 with heatsink) | | Audio amp IC | BA536 (hard to find – use LM386 module externally) | | Volume pot | 10kΩ linear, 16mm splined shaft | | Crystal sockets | Mill-Max 0305-2-15-15-47-27-10-0 |

: Includes 16 vacuum tubes (notably the 6BZ6, 6U8, and 12AX7 series) alongside 15 diodes and 7 transistors.

: Includes a 100 kHz calibrator to ensure the VFO dial remains accurate against reference signals like WWV. Maintenance & Restoration

: Often cited as an affordable entry point for many amateur radio operators in the 70s, it remains a popular item for vintage radio restorers today. Tempo One Presented by Fox Tango International sommerkamp ft 250

: Uses a high-stability heterodyne VFO and a 9 MHz crystal filter for voice quality. Clarifier : Provides ±5plus or minus 5

The 6JS6C sweep tubes are no longer in production. While New Old Stock (NOS) tubes can still be found online, they are becoming increasingly expensive. Operators must ensure their neutralization circuit is properly adjusted to prevent parasitic oscillations that can rapidly destroy these tubes. 3. Band Switch and VFO Cleaning

At the core of its voice quality is a specially engineered , which provides sharp sideband suppression (-40 dB) and carrier rejection (-40 dB). Operating modes automatically select the correct sideband—Lower Sideband (LSB) on 40/80 meters and Upper Sideband (USB) on 20/15/10 meters—though a toggle switch allows operators to manually reverse this setting. 3. Operating Conveniences Receiver Clarifier: Provides a ±plus or minus

The FT-250 was designed as a compact, high-performance HF transceiver intended for home, field, and mobile use. It bridged the gap between large, desk-bound tube rigs and the emerging, fully solid-state era. Technical Specifications and Performance It is a hybrid

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| | Specification | | :--- | :--- | | Frequency Bands | 80m, 40m, 20m, 15m, 10m (amateur bands) | | Frequency Range | 3.5 - 4 MHz; 7 - 7.5 MHz; 14 - 14.5 MHz; 21 - 21.5 MHz; 28.5 - 29 MHz | | Modes | SSB (USB/LSB), CW, AM (with reduced carrier) | | Power Output | Input power of 200W , yielding approximately 100-120W output on SSB and CW, and 25W on AM | | Receiver System | Single-conversion superheterodyne using tubes, with an IF frequency of 9 MHz | | Sensitivity | 0.5 µV for 10 dB S/N | | Selectivity | 2.3 kHz at -6 dB, 4 kHz at -60 dB | | Audio Bandwidth | 300 - 2700 Hz (for SSB) | | Antenna Impedance | 50-100 Ω | | Dimensions (WxHxD) | 13.2" x 5.5" x 11" (335 x 140 x 280 mm) | | Weight | 17.6 lbs (8 kg) for the main unit | | Valves (Tubes) | 16 tubes, including a 7360 balanced modulator and 6JS6C final amplifier | | Transistors | 8 transistors | | Power Supply | Requires external supply, typically the FP-200/250 for AC or DC-200/250 for 12V DC | | Original Price | 1,398.00 DM in 1969 |

The FT 250 likely features a modern and sleek design, constructed from high-quality materials that can withstand outdoor conditions. Common materials include stainless steel, glass, and ceramics.

80, 40, 20, 15, and 10 meters. The 10m band was typically divided into four 500 kHz segments. : Includes a 100 kHz calibrator to ensure

and was widely marketed in Europe under the Sommerkamp brand. Known for its hybrid design—combining solid-state components with vacuum tubes in the driver and final amplifier stages—it remains a favorite among vintage radio enthusiasts. RigPix Database Key Technical Specifications Frequency Range

Despite lacking modern features like digital signal processing (DSP), dual VFOs, Bluetooth, or alphanumeric displays, the Sommerkamp FT-250 retains an ironclad legacy.

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