MOPA 1930's Replica Vacuum Tube Driven Oscillator / Amplifier

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.

MOPA 1930's Replica Vintage Vacuum Tube Oscillator / Amplifier tech specs:

• Built by hand in the USA with each unit individually tested for quality assurance with 1 year warranty.
• Proven Design: Vacuum Tube technology used for over 80 years combined with solid state technology for reliability while retaining the output style delivered only by vacuum tube oscillators.
• Amplification Method: Original Vintage Vacuum Tube Amplification
• Amplification Voltage: High Voltage. Unique vintage design uses a high 1160 volts to drive the vacuum tube oscillator retaining the authentic 1930's type of output.
• Amplification Current: Low Current. This design takes advantage of the high voltage amplification and uses only 30 to 140 milliamps of current.

Here's a few more specs on our new 1930's replica MOPA Oscillator / Amplifier:

• It's got a built in Milli-amp power meter so you know what power output you are running.
• The waveform is sine wave just like the 1930's vintage oscillators.
• The sine wave is an analog wave due to the vacuum tube oscillator so it doesn't need a Digital to Analog converter like all the solid state designs require to simulate an analog waveform.
• The carrier frequency is variable and adjustable using the knob on the front of the unit. Because of the 1930's vintage replica design this knob actually controls a variable capacitor which is controlling the frequency of the carrier wave.
• Carrier frequency range is approximately from 1.1 MHz to 1.9 MHz (1,100,000 cycles per second to 1,900,000 cycles per second).
• Power output is variable with an average power output of approximately 60 watts (at 140 milli-amps showing on the meter).
• Peak power output is much higher when gated/modulated with the output from the GB4000 function generator. The peak output power is approximately 250 watts on the leading edge of the spiked waveform generated from this type of output.

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

• Can output frequencies through a metal or plasma tube antenna (not sold by us but we know some good suppliers).
• The maximum frequency output available with capability to run 8 frequencies at the same time with the GB4000.
• Amplifier output is analog using the original vacuum tube amplification.
• Allows input of GB4000 audio frequencies up to 40,000 hertz with 100% AM modulation just like the 1930's vintage oscillators
• Gating or pulsing of frequencies from 1 Hz to 40,000 Hz is possible with the GB4000 connected.
• 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.

Here's a few advantages of this 1930's Vintage MOPA Design over the modern simulations:

• Quick and easy, instant ignition of a plasma tube (not sold by us). No SWR meter needed. If you don't know what one is trust me you don't want to! And with our MOPA design you won't need to.
• The broadcast range is up to 1700 feet with a useful range of about 30 feet when using a plasma tube. I personally use it in a range of 1 to 5 feet and find this to be best with a plasma tube.
• Compact design with a small footprint of only 10.5" wide x 17" long and 10" high.
• The power usage is only 150 watts.
• Only weighs 19 pounds!

GB4000 with MOPA Amplifier / Oscillator

Comparison with Other Plasma Tube Oscillator Machines:

Features	GB4000 & M.O.P.A. with Plasma tube	Perl & ProGen with Plasma Tube	EMEM F-117 with Plasma Tube	*EM type devices with Plasma Tubes	BCX Ultra with Plasma Tubes	Beam Ray with Plasma Tube	BCX 211 411 with Plasma Tubes	EMX with Plasma Tube
Capable of modulating frequencies
RF Carrier Frequency	Variable 1.1MHz to 1.9MHz	Fixed 27MHz	No Carrier Frequency	No Carrier Frequency	3 Fixed 1MHz 1.25MHz 1.67MHz			All 20 million output directly
Outputs simultaneous audio frequencies	8	Only with additional generators			2
Single audio frequency output
Can produce side bands	16	6 Only with additional generators			4		2
Frequency range in hertz	20 Million Only from GB4000	1 Million Only from ProGen	10,000	10,000 to 14,000	100,000	10,000	40,000	20 Million
Analog frequencies
50% duty cycle
10 - 90% duty cycle
Square Wave
Sine Wave
RF Power level (approximate)	60 watts average power 250 watts peak power	60 watts	No RF	No RF	18 watts	No RF	18 watts	0.10 watts
Programmable auto channels								Depends on generator used
Gating features
Frequency sweeps
Converge sweeps
Displays actual frequencies
Outputs 1920s Frequencies	Direct and through Plasma Harmonic
Outputs 1930s Frequencies
Outputs 1940s Frequencies			Some	Some		Some
Outputs 1950s Frequencies

*Any plasma tube instruments that are EM (electro-magnetic) do not use RF (radio frequency) frequencies or an RF carrier frequency. They use coils to produce a high electromagnetic field to carry the frequencies to the target. They are limited to about 10,000 hertz but a few go to 30,000 hertz. Due to the fact that many manufacturers use similar designs and use an EM field to deliver the frequencies, we have included them in the chart as "EM devices with Plasma tubes." Since they do not use an RF carrier frequency it is
almost impossible to determine their power output. Almost none of these maufacturers list the power output of their equipment. For this reason we list in the "Power level" field No RF so that the reader knows that they do not us an RF carrier frequency or output any RF frequencies. They will have names such as Light Wave Blaster, EMEM, Beam Ray, Plasma Plus II, F-117, EMEM2, EMEM3D, EMEM3DV, EMEM5's EM7V and System 8CE EM+. They generally are very good instruments and work well. The only limits, except for the EMX, are the frequency range. They only output low audio frequencies. The EMX goes up to 20 million hertz but only has the power output of one tenth of one watt. All the original 1920s through the 1950s instruments used RF and had an average power output from 25 to about 50 watts.

Connecting the MOPA Vacuum Tube Amplifier / Oscillator to a plasma tube antenna:

There are many options for plasma tubes and we've even arranged one that has a very reasonable price for a basic tube that is optimized for the power output from the MOPA. We'll provide their contact information prior to shipping your MOPA.

Shown below is the MOPA connected to a plasma tube. This type of tube, which has no internal electrodes that cause early burnout, is the best to use for reliability and affordability:

And here it is with the tube glowing while the GB4000 is running frequencies into the MOPA:

One of the ways to connect the GB4000 to the MOPA Vacuum Tube Oscillator / Amplifier is with a BNC connection (GB4000 will need to be sent to the factory for modification)  as shown below:

It is recommended that you purchase an Elenco F-2800 Frequency Counter (shown on right) to properly read the frequency output of the MOPA 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 for around $99.00

M.O.P.A. Vacuum Tube Amplifier / Vacuum Tube Oscillator with 60 Watts Output

The MOPA Vacuum Tube Oscillator / Amplifier units are custom order devices only made to contract which require an initial deposit. Once we receive your signed contract and your initial deposit of $500 USD we will start building your replica MOPA Amplifier and ship the completed unit within 3 weeks pending your full and final payment of the remaining sum. When you place your order here we will bill you the $500 deposit and our system will then authorize your card again in 2 weeks for the remaining $2095 which will not be actually billed to your account until your unit is ready to ship. Paypal and debit cards work a bit differently and the 2nd billing will happen with these transactions on the two week mark.

If you have questions about the replica M.O.P.A. Vacuum Tube Amplifier / Oscillator
call Future Tech Today at 1-541-434-0318.

Important Note: All units are built to order and you must sign an agreement which waives our liability for any potential FCC or AM radio interference issues. Once you receive your unit you'll have 30 days decide if it's right for you. You may return it for refund during this period and IF (and only if) you keep it in perfect, new condition without any scratches or other damage we'll waive the standard $300 restocking fee, but you must return it to us at Future Tech Today Inc. You will have to cover the shipping that we paid and your return shipping, but that is only fair.

All Units will include the following:

• DVD setup video
• 1 year parts and labor limited warranty
• Information on a good source for a tube

Tube not included.

Note about plasma tubes: I've coordinated with a supplier of a nice, simple helium/argon filled tube which is optimized for the power output of this vintage MOPA design and they charge $260 plus shipping for it. It's a 2" diameter, 14" long tube made of pyrex glass with no internal electrodes because these have impurities in the metal which causes the tubes to burn out faster (especially with the high peak power output of the MOPA design!). I'll provide you with the contact information at least a week before your unit is ready to ship so you can get one on order if you choose. There are plenty of suppliers of plasma tubes although they typically cost much more than this and most of them will burn out with the power delivered by the vintage MOPA design. With this $260 tube I can guarantee it will handle the power output of the MOPA.

Start your order online here:

• Choose whether you are ordering "MOPA Oscillator/Amplifier Only" (if you already have a GB4000) or the "MOPA Oscillator & GB4000 Generator Combo"
  
• Investment for MOPA Oscillator is a total of (no tube included): $2595
• A deposit of $500 starts us building your unit
• In 1 to 2 weeks your unit will be completed. Shipping not included for non-US orders.
  

• If you don't already have a GB4000 you'll want one so your total will be $4305 (tube not included). If you are in the US you can use this button which adds the GB4000 Generator ($1710) to the deposit ($500)
  
• In 1 to 2 weeks your unit will be completed and as long as your final payment has been authorized we ship your unit. We cover the shipping in the US.

  

• If you don't already have a GB4000 you'll want one so your total will be $4305 (tube not included). If you are not in the US you can use this button which adds the GB4000 Generator ($1710) to the deposit ($500)
  
• In 1 to 2 weeks your unit will be completed and as long as your final payment has been authorized we ship your unit. Our system will estimate shipping expenses and add this to your payment today. Keep in mind that the MOPA is quite large and heavy and ships in a separate box from the GB4000.

  

• If you already have a GB4000 you will need to send in your unit for a quick modification that adds the BNC connection to the back which connects it to the MOPA. This button will start your order with the $500 deposit. We will contact you with information on where to send your GB4000 for the factory authorized modification which will not void your GB4000 warranty. There is no cost for this modification aside from your shipping expenses in both directions.
  
• In 1 to 2 weeks your unit will be completed and as long as your final payment has been received we ship your unit. We cover the shipping in the US and if you are in Canada or Overseas we'll get you a quote for shipping.