Viking Adventurer CW Transmitter Kit
807 @ 50 watts CW input 80-10 meters
Information from the Owners/Assemby Manual
Viking ADVENTURER CW Transmitter
- Manufacturer: E.F. Johnson Company, Waseca Minnesota
- Years offered for sale: 1954-1963
- Suggested Price (Amateur Net)
- Kit-complete with tubes, less crystals & key:$54.95(CAT#240-181-1)
- Wired and Tested: $69.95
- Power Input: 50 watts
- Antenna Output Network
- Pi-network output tuning more than 30db harmonic attenuation
- Matching Network:50-600 ohm
- Ceramic insulators used
- Output Capacity: 25-1350 mmf
- Bandswitching on 80, 49, 20, 15, abd 10-11 meters
- Tube Line-up
- 6AG7 Crystal Oscillator-Multiplier-VFO Buffer
- 807 Transmitting type RF Power Amplifier
- 5U4G Rectifier
- TVI Suppression
- Completely shielded cabinet
- Coaxial type output connector
- Inductance-Capacity type filters on AC and key leads
- Low inductance by-passing of meter and filiament connections
- Power Supply
- Husky design
- 450 Volts DC at 150 ma
- 6.3 AC at 2 amps
- 8 pin (Octal) jack at rear apron for VFO, or other accessory
- Fused AC transformer primary
- VFO Operation
- 5 milliwatts (8-10 volts across 22,000 ohms) drive required
- VFO frequency useable: 160/80/40
- Metering
- Front Panel Switched
- RF Amplifier Plate Current
- RF Amplifier Grid Current
- Kit-complete with tubes, less crystals & key:$54.95(CAT#240-181-1)
- Wired and Tested: $69.95
- Pi-network output tuning more than 30db harmonic attenuation
- Matching Network:50-600 ohm
- Ceramic insulators used
- Output Capacity: 25-1350 mmf
- 6AG7 Crystal Oscillator-Multiplier-VFO Buffer
- 807 Transmitting type RF Power Amplifier
- 5U4G Rectifier
- Completely shielded cabinet
- Coaxial type output connector
- Inductance-Capacity type filters on AC and key leads
- Low inductance by-passing of meter and filiament connections
- Husky design
- 450 Volts DC at 150 ma
- 6.3 AC at 2 amps
- 8 pin (Octal) jack at rear apron for VFO, or other accessory
- Fused AC transformer primary
- 5 milliwatts (8-10 volts across 22,000 ohms) drive required
- VFO frequency useable: 160/80/40
- Etched Aluminum Cabinet
- Dark Marroon & Gray Finish
- Johnson type Knobs & Dials
- Size-7 3/8" High, 10 3/8" Wide, 8 1/4" Deep
- Net Weight: 13 lbs, Shipping Weight: 19 lbs.
- Oscillator Tuning
- 80-10 Meter Bandswitch
- RF Amplifier Tuning
- Coarse Antenna Coupling Switch
- Fine Antenna Coupling
- AC On-Off
- Meter Function Switch
- 1/4" Key Jack
- VFO-Crystal Receptical
- AC Power Indicator Light
- 8 Pin (Octal) Power Jack
- Coaxial type Antenna Connector (RCA Phono)
- Ground Terminal (8-32 stud & nut w/ washers)
Text from the Manual-
Loaded with features for both the novice and experienced amateur, the new Viking "Adventurer" kit packs enough power for world-wide CW contacts. Completely self-contained, single-knob bandswitching and effectively TVI suppressed, the "Adventurer"operates crystal or external VFO control. The RF lineup consists of a 6AG7 oscillator/Multiplier and an 807 power output tube. This tube works straight through on 80, 40, 20 and 15 meters and as an efficient doubler on 10-11 meters. Front panel meter switching monitors final grid or plate currents. Clean and crisp break-in keying is accomplished by keying both oscillator and final amplifier circuits simultaneously.
A power receptacle on the rear apron provides for the operation of auxiliary equipent such as a VFO, or signal monitor from the transmitter power supply, or for plugging in a modulator for phone operation. This receptacle is wired to permit using the full 450 VDC at 150ma and 6.2 VAC at 2 amp. output of the supply to pwer other equipment when the transmitter is not operating. The power supply is fused for protection from overload damage.
Designed to handle a wide variety of antennas without using a separate antenna tuner, the wide range pi-network output circuit will accomodate antenna impedances for 50 to 600 ohms. It is also capable of tuning out large amounts of reactance.
Professional in appearance and exremely compact, the "Adventurer" is engineered throughtout for easy construction and operation by the amateur with a minimum of equipment wiring and operating experience. Wire, punched chassis, all parts, hardware, tubes and connectors furnished. Complete step-by-step assembly instructions, pictorial diagrams and operating instructions included.
NOTES ON ADVENTURER PICTURED:
This "Adventurer" was purchased through an advertisement in Electric Radio Magazine. It came to Hawaii through the US Mail, well packed and arrived in good shape. It was tired, dirty, scratched and missing some hardware with a small amount of rust on some hardware. The cabinet front had no extra holes. The rear apron had an SO-239 coaxial connector installed (Very Common).
I carefully, with a nibbling tool and file made neater installation of the existing coaxial connector. An external 3AG fuse holder was added to the existing AC transformer primary protection. Some "Fantastic" cleaner was used with some paper towels to remove the top layer of gunk and dirt. The 1/4" key nut and chrome ring were replaced, and some of the mounting hardware will be replaced later. New stainless steel cabinet screws were added. The interior wiring was inspected and it was determined that it was a factory wired unit and that there was no wiring corrections required. The tubes were tested and operation checked. The output at 7 mhz was 22 watts into a dummy load.
More work will be completed later, with a screen or plate modulator interfaced in the future.
Last Updated: December 9, 1997