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Linear Amp Discovery 70 - 432MHz GS31 Linear Amplifier

Linear Amp Discovery 70 - 432MHz GS31 Linear Amplifier
  • Over 800W Output for 100W drive
  • 100% duty cycle
  • Russian GS31 Triode
  • UK Manufactured by us here on the Welsh Borders
  • Quiet operation
  • Auto soft start
  • 3 minute warm up timer
  • Anode and grid protection
  • Rugged steel chassis
  • N-Type Input and Output connectors
The ultimate DX or EME amplifier for 432MHz.

For Radio Amateurs that need effortless, reliable power for contesting, DXing or EME.

The Linear Amp UK Discovery 70 utilises a single Russian GS31 triode and will produce up to 900 Watts output with 100W of drive.

All brass anode stripline - silver plated on request for minimal losses and long term stable operation.

Heavy duty UK made 2.2kVA toroidal transformer with a high power voltage doubler HT board.

Fully specified control and protection circuit board offering anode flashover protection, grid overdrive trip, auto soft start and in-built 3 minute warm-up timer.

The cooling is via an integral high performance centrifugal fan.

Quiet coaxial changeover relays used for input and output with sequential switching to eliminate hot changeover arcing.

All built into a CNC punched and folded steel chassis with 3mm aluminium front panel.

100% duty cycle - Full output can be maintained all day long for EME, Data Mode and contest operation.


Frequency coverage 430-440 MHz
Output power Over 800W
Input power up to 100W
DC Anode voltage 3600V DC
Gain 9dB nominal
Power requirements 230V AC at 13A, 50/60Hz
Valve GS31 triode
Relays Coaxial Output and Input
Metering Plate current, Grid current, Relative RF Output
Dimensions 14in wide x 9.75in high x 17in deep 360mm x 250mm x 430mm
Weight 29kg

Linear Amp Discovery 70 Anode Box View

Linear Amp Discovery 70 Cathode BoxLinear Amp Discovery 2 control board