For Sale...144mhz linear amplifier...
Posted: Thu Jun 13, 2013 5:07 pm
Hi all...I have a new 144mhz amplifier for sale...This unit is built around a GS-31B triode in Grounded Grid using a 1/4 wavelength plate line tank circuit..It features both Tune and Load controls on the front panel..
The HT supply uses a custom wound Toroidal transformer, Voltage Doubled to produce 3300vdc..The amplifier has a 12 volt relay switching PSU...PTT can be activated manually from the front panel or via a remote switch line from a transceiver..Output relay is a Dow Key..Input and output uses N type sockets..
The amplifier uses a variable Bias controlled from the front panel utilising the reliable W4ZT Bias control board..All amplifier control functions are set out on the front panel making it user friendly and easy to operate..The amplifier uses two easy to read panel meters for Grid and Plate current..
Cooling is achieved with a 6 inch Papst fan operating from a 20vdc power supply...This fan produces more than ample air flow through the tube...The RF deck is sealed and pressurised...The air flows through the GS-31B finned cooler and exits the amplifier via a Teflon chimney...The Cathode compartment uses a smaller cooling fan blowing air over the Cathode/Filament of the tube and exits the compartment via vents on the amplifier case...
The amplifier has been extensively run and tested for reliability producing up to 1kw output SSB/CW and 500 watts continuous carrier..At these powers the amplifier runs cool...This unit is just coasting along at the VK 400 watt power limit and is suitable for EME work for those who hold the required High Power permit..
I have used all new components in this amplifier including the hand made case..The dimensions are 17 inches wide x 17.5 inches back and 12 inches high including the machined amp legs..The amplifier weighs about 26kg..It would be shipped via courier the transformer removed and shipped separately for safety..If you want full details or more pictures
I can be contacted by phone 0355791403 or direct by email vk3zl@bigpond.com ..
73..Bob..VK3ZL..
The HT supply uses a custom wound Toroidal transformer, Voltage Doubled to produce 3300vdc..The amplifier has a 12 volt relay switching PSU...PTT can be activated manually from the front panel or via a remote switch line from a transceiver..Output relay is a Dow Key..Input and output uses N type sockets..
The amplifier uses a variable Bias controlled from the front panel utilising the reliable W4ZT Bias control board..All amplifier control functions are set out on the front panel making it user friendly and easy to operate..The amplifier uses two easy to read panel meters for Grid and Plate current..
Cooling is achieved with a 6 inch Papst fan operating from a 20vdc power supply...This fan produces more than ample air flow through the tube...The RF deck is sealed and pressurised...The air flows through the GS-31B finned cooler and exits the amplifier via a Teflon chimney...The Cathode compartment uses a smaller cooling fan blowing air over the Cathode/Filament of the tube and exits the compartment via vents on the amplifier case...
The amplifier has been extensively run and tested for reliability producing up to 1kw output SSB/CW and 500 watts continuous carrier..At these powers the amplifier runs cool...This unit is just coasting along at the VK 400 watt power limit and is suitable for EME work for those who hold the required High Power permit..
I have used all new components in this amplifier including the hand made case..The dimensions are 17 inches wide x 17.5 inches back and 12 inches high including the machined amp legs..The amplifier weighs about 26kg..It would be shipped via courier the transformer removed and shipped separately for safety..If you want full details or more pictures
I can be contacted by phone 0355791403 or direct by email vk3zl@bigpond.com ..
73..Bob..VK3ZL..