GB4000 + M.O.P.A. Combo
The GB4000 generator paired with the M.O.P.A. (Master Oscillator Power Amplifier) — an updated replica of the original 1930s/1950s plasma tube equipment. Up to 190W of non-contact output through a noble-gas plasma tube, over a 30+ foot range. Sleep, work, read, or move freely while it runs.
Complete kit — GB4000, M.O.P.A. amplifier, plasma tube & reflector. One order from New Zealand.
Hands-Free
No electrodes, no wires, no mats. The M.O.P.A. broadcasts through the air — sleep, watch TV, cook, or work while it runs.
Up to 190W Output
Variable 20W–190W. Almost 2.5× more powerful than the original 1936 instrument, and more powerful than any other plasma tube device on the market.
30–40+ Foot Range
Over 30 feet in all directions without the reflector. Over 40 feet focused forward with the included directional reflector.
Variable RF Carrier
Variable carrier from 2.3–3.7 MHz — exclusive to the M.O.P.A. No other plasma tube instrument has this capability. Produces 100+ harmonic sidebands simultaneously.
8 Frequencies at Once
Run 2 to 8 audio frequencies simultaneously through the plasma tube. No other instrument has this capability. Up to 8× faster than running one at a time.
Complete NZ Kit
Most distributors make you source the generator, plasma tube, and accessories separately. We ship everything together as one complete, tested kit from New Zealand.
See the GB4000 + M.O.P.A. System
Watch how the M.O.P.A. connects to the GB4000, how the plasma tube lights up, and how to run your first auto-channel session.
What does "non-contact" mean?
Instead of electrodes attached to the body, the M.O.P.A. broadcasts frequencies through the air via the plasma tube. This means the user can move freely within its range — no wires, no mats, no contact required.
Common use cases include sleeping, watching TV, reading, cooking, or working while the unit runs. The closer you are to the tube, the greater the power received — but the full useful range extends to 30+ feet.
Sleep
Run overnight sets while you rest
Work
Keep running while at your desk
Move freely
Walk within its 30+ foot range
Power and range
The M.O.P.A. offers a variable output from 20W up to a maximum 190W — the user has complete control of output intensity via the power dial. This output is broadcast through the Pyrex plasma tube, which can emit frequencies over a very broad range without needing to be tuned.
30+ ft
Without reflector
360° output in all directions around the plasma tube
40+ ft
With directional reflector
180° focused forward — included with the kit
The effective range is based on physiological effect calculations using the Inverse Square Law: the M.O.P.A. delivers 0.21 watts at 30 feet and 0.11 watts at 40 feet. For greatest power absorption, the suggested range is 1 inch to 2 feet from the tube.
The plasma tube
The system uses a noble-gas (Argon/Helium) Pyrex plasma tube, 2 inches round by 14 inches long. It is conduction-lit — meaning there are no internal metal electrodes to contaminate the gas — and ignites instantly. Rated for tens of thousands of hours of use.
Unlike metal antennas, a plasma tube can emit frequencies over a very broad range without being tuned for a specific frequency. The tube is also safe to touch — there is no high-voltage electromagnetic field concern.
NZ kit note: The plasma tube and reflector are matched and tested specifically for the M.O.P.A. circuit for correct power handling. Our NZ kit includes the correct tube ready to go — unlike buying direct from the US manufacturer, where the plasma tube must be sourced separately.
Variable RF carrier — exclusive to the M.O.P.A.
The M.O.P.A. has its own built-in variable carrier frequency covering approximately 2.3 to 3.7 MHz — the same range used by the original 1930s/1950s instruments. A built-in frequency counter allows you to accurately set the carrier frequency before running.
No other plasma tube instrument has a variable carrier frequency. This capability allows broadband sideband frequency sweeps from approximately 1.7 to 4.3 MHz — producing over 100 harmonic sideband frequencies simultaneously, exactly as the original machines did.
Run up to 8 frequencies at once
The GB4000 + M.O.P.A. is the only instrument capable of running up to 8 audio frequencies simultaneously through a plasma tube, up to 40,000 Hz, without frequency degradation. No other plasma tube instrument has this capability.
24 min
Running 8 frequencies
one at a time
3 min
Running 8 frequencies
simultaneously
At the average 3 minutes per frequency, running 8 one at a time takes 24 minutes. The GB4000 + M.O.P.A. runs all 8 in the same 3 minutes. It's like having 8 frequency generators in one.
Everything the GB4000 already does
Because this combo includes the GB4000 generator, you retain all of its core capabilities alongside the M.O.P.A.'s power and range.
Full Technical Specifications
| Specification | GB4000 Generator | M.O.P.A. Amplifier |
|---|---|---|
| Method | RF — same as original machines | RF — same as original machines |
| Frequency range | 1 Hz – 20,000,000 Hz | 1 Hz – 20,000,000 Hz |
| Modulation range | 1–400,000 Hz at 100% | 1–400,000 Hz at 100% |
| RF carrier | Fixed 3.1 MHz | Variable 2.3–3.7 MHz |
| Power output | Audio: 0.75W · RF: 3.7W | Variable 20W – 190W |
| Plasma tube range (no reflector) | N/A | 30+ feet · 360° |
| Plasma tube range (with reflector) | N/A | 40+ feet · 180° |
| Greatest power absorption range | Direct contact | 1 inch – 2 feet |
| Simultaneous audio frequencies | 2–8 (to 40,000 Hz) | Amplifies GB4000 output |
| Simultaneous RF frequencies | 2 (to 20,000,000 Hz) | Amplifies GB4000 output |
| Harmonic sideband frequencies | Yes | 100+ simultaneously |
| Sideband sweep range | 2.6–3.6 MHz | 1.7–4.3 MHz (variable carrier) |
| Programmable channels | 2,000 · 875 pre-programmed | N/A |
| Frequency counter | On-screen display | Built-in analogue meter |
| Waveforms | Square · pulsed square · sine · Hoyland | Analogue sine wave + sidebands |
| Gating / pulsing | 1–5,000 Hz · 10–90% duty | Amplifies GB4000 output |
| Circuit technology | Solid-state electronics | Solid-state + 812a vacuum tube |
| Amplification voltage | 115V peak-to-peak (RF mode) | 1,350V high voltage · low current |
| Power supply | 110V or 220V configuration | 110V or 220V · 350W (375W with GB4000) |
| Plasma tube gas | N/A | Argon / Helium / Argon-Helium mix |
| Size | 8"W × 9.5"L × 4"H | 10.5"W × 17"L × 10"H |
| Weight | 2 lbs (0.9 kg) | 19 lbs (8.6 kg) |
| Warranty | 2-year | 2-year (90-day exception on 812a tube) |
| Built | Hand assembled · USA · factory tested | Hand assembled · USA · factory tested |
One order. Everything included.
Most distributors make you source the pieces separately — generator from one site, plasma tube from another, frequency list book from yet another. We ship everything together as one complete, tested kit from New Zealand.
Good · Better · Best
GB4000 alone
The best standalone frequency generator on the market. Complete and powerful as a starting point.
GB4000 + SR4
Moves to the next level of contact performance. Up to 15W, multiple users.
GB4000 + M.O.P.A. ← You are here
The very best affordable plasma tube system on the market today. The only system that can output the original 1930s/1950s frequencies through a plasma tube.
Ready to order, or want to compare first?
The M.O.P.A. combo is our most capable system. If you're comparing it with the SR4 combo or the standalone GB4000, the comparison page shows everything side by side.