New - M.O.P.A.
Master Oscillator Power Amplifier
1930's to 1950's Equipment Replica
with Updated Advanced Technology
Exceeds All Other Gas Tube Instruments.

The M.O.P.A. Amplifier (Master Oscillator Power Amplifier) provides a variable 1.1 MHz to 1.9 MHz frequency oscillation with low frequency pulsation from the GB4000 function generator. Is is a 1930-1950 M.O.P.A. replica. When connected to the GB4000 it is capable of outputting 8 frequencies simultaneously.

The M.O.P.A. Master Oscillator Power Amplifier is capable of the following:

• Modern solid state equipment uses lower voltage and high current output, but the M.O.P.A. is a high voltage low current output. This is the same method used in the 1930-1950 equipment
• Its sine wave oscillator frequency range covers 1.1 MHz to 1.9 MHz using a variable tuning capacitor
• Average power is 50 watts. Peak power when gated or modulated is 250 watts
• Can output frequencies through a metal or plasma tube antenna
• Amplifier output is analog using the original vacuum tube amplification
• Allows input of GB4000 audio frequencies up to 40,000 hertz
• Allows any frequency from 1.1 MHz to 1.9 MHz to be used as a stand alone frequency or as a carrier wave for square wave audio frequencies input from the GB-4000
• Any frequency from 1.1 MHz to 1.9 MHz can be gated or pulsed using the GB-4000
• Connects to the GB-4000 through regular banana jacks or a BNC connection
• Fabrication: Built by hand and tested for quality assurance with one year warranty
• Proven design: Solid state combined with vacuum tube technology used for over 80 years
• Amplification method: Original vacuum tube amplification
• Amplification voltage: High voltage (1160 volts)
• Amplification current : Low current (30 to 140 milliamps)
• Vacuum tube vs Solid state amplification: Modern solid state uses low voltage and high current designs. The M.O.P.A. uses the high voltage low current design
• Milliamp meter: Built in
• Waveform: Sine wave
• Sine wave: Analog
• Carrier frequency: Variable
• Carrier frequency range: Approximately 1.1 MHz to about 1.9 MHz.
• Carrier frequency tuning: Variable tuning capacitor
• Power output: Variable average power with a maximum of approximately 60 watts at 140 milliamps
• Peak power: When gated or modulated, approximately 250 watts on the high potential voltage rise on the leading edge of the square wave waveform
• Frequency input method: Designed to work exclusively with the GB-4000 frequency generator through banana jacks or a BNC connection
• Frequency output modulation: GB-4000 audio frequencies up to 40,000 hertz square wave @ 100% AM modulation
• Maximum frequencies output: When connected to the GB4000 it can transmit up to 8 frequencies simultaneously
• Gating or pulsing: 1 to 40,000 hertz using the GB-4000
• Frequency delivery: Metal or plasma tube antenna (sold by another company)
• Tube ignition: instantaneous with no SWR meter needed
• Broadcast range: 1700 feet with useful range of about 30 feet when using plasma tube
• Suggested range: 1 to 5 feet when using plasma tube
• Size: Compact design - 10.5" Wide X 17" Long X 10" High
• Power used: 110/120 volts AC
• Power usage: 150 watts
• Weight: 19 pounds

Please note: plasma tube including copper collars with wire and plasma tube holder sold separately from another company for $260.00 plus shipping. We will provide you the phone number for that company so you can order it when you order your M.O.P.A. This plasma tube is made of Pyrex and is a 2" inch round by 14" inch long helium filled tube. It is guaranteed to handle the power output of the M.O.P.A.

We recommend the purchase of an Elenco F-2800 Frequency Counter to properly read your
M.O.P.A. Frequency Amplifier. Since the M.O.P.A. Oscillator/Amplifier uses an old style variable capacitor it is necessary to have a frequency counter so you can set the instrument to what ever frequency you wish to use from 1.1 MHz to 1.9 MHz.

Please note: Frequency counter not supplied with the purchase of the M.O.P.A. Amplifier.

It can be purchased from All Spectrum Electronics 1-877-899-7400 for around $99.00