GB4000 + SR4 Combo
The GB4000 generator paired with the SR4 30 MHz linear amplifier — the most powerful contact frequency instrument available today. Up to 15W variable output, 75× more powerful than most competing devices, with four hookup sets for multiple simultaneous users.
Complete kit — GB4000 generator, SR4 amplifier, NZ-made stainless accessories & frequency list book. One order from New Zealand.
Up to 15W Output
The SR4 amplifies the GB4000's 4.7W to a variable 1–15W. That's 75× more powerful than most contact frequency instruments on the market — the highest available in any contact device.
Perfect Accuracy
Crystal Oscillator combined with a Digital Signal Processor. Accurate to 0.01 Hz across the full 1 Hz to 20 million Hz range. Frequencies guaranteed not to drift once set.
Multiple Users
The SR4 has 4 sets of dual outputs — 8 connection points in total. All positive outputs are connected together, so multiple people can run electrodes from the same unit simultaneously.
8 Frequencies at Once
The GB4000 is the only instrument capable of running up to 8 audio frequencies simultaneously to 40,000 Hz — and the SR4 amplifies all of them. Up to 8× faster than any single-frequency instrument.
Easiest Interface
Full membrane keypad — instant access to every function with no scrolling. 875 channels pre-loaded and ready to run out of the box. 2,000 channels total for your own custom programmes.
Complete NZ Kit
Most distributors make you source the generator, accessories, and frequency list book separately. We ship everything together as one complete, tested kit from New Zealand.
Highest power output in a contact device
The GB4000 alone is already 10 to 15 times more powerful than most other contact frequency instruments on the market — at 4.7W RF output and 115 volts peak-to-peak. When you add the SR4 amplifier, that rises to a variable 1 to 15 watts, making it the most powerful contact frequency system available today. The SR4 connects to the GB4000 via two cables and power output remains fully controlled by the GB4000's output knob.
4.7W
GB4000 RF mode
115V peak-to-peak
15W
GB4000 + SR4
Variable 1–15W output
75×
More powerful
vs most contact instruments
Frequency range and accuracy
The GB4000 uses a Crystal Oscillator combined with a Digital Signal Processor to generate its frequencies — then converts to analog before output amplification. The SR4 then amplifies this analog signal from 1 to 15 watts. This means you get the precision of digital generation and the power of analog amplification.
Built for multiple users
The SR4 has four sets of dual outputs — 8 connection points in total. All positive outputs are wired together and all negative outputs are wired together, so it doesn't matter which set you use. Multiple people can run electrodes from the same unit at the same time, making it practical for household or small-clinic use.
4
hookup sets
2
connections each
8
total connection points
Deliver contact frequencies to multiple people simultaneously — each using their own set of hand cylinders or foot plates.
Included accessories in the NZ kit:
Run up to 8 frequencies at once
The GB4000 is the only instrument capable of running up to 8 audio frequencies simultaneously to 40,000 Hz without frequency degradation. The SR4 amplifies all of them at the same time. No other instrument on the market has this capability built in as standard.
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 + SR4 runs all 8 in the same 3 minutes. It's like getting 8 frequency generators for the price of one.
Easiest user interface
The last thing you want is to fight your instrument to produce the frequencies you need. The GB4000 has a full membrane keypad with every function and number directly accessible — no scrolling through menus. The frequencies display on screen and in the manual. No hidden frequencies.
Full Technical Specifications
| Specification | GB4000 Generator | SR4 Amplifier |
|---|---|---|
| Method | RF — same as original machines | RF — amplifies GB4000 output |
| Frequency range | 1 Hz – 20,000,000 Hz | 1 Hz – 20,000,000 Hz |
| Modulation range | 1–400,000 Hz at 100% | Amplifies GB4000 output |
| RF carrier | Fixed 3.1 MHz (crystal) | Amplifies GB4000 output |
| Output power | Audio: 0.75W (38VPP) RF: 4.7W (115VPP) | Variable 1–15W (RF mode) |
| vs competitors | 10–15× more powerful | Up to 75× more powerful |
| Contact method | Electrodes — hand cylinders, foot plates | Electrodes — hand cylinders, foot plates |
| Output connections | 4 (most competitors have 2) | 8 (4 sets of dual outputs) |
| Multiple users | Single user | Yes — all outputs connected |
| Output resolution | 0.01 Hz | 0.01 Hz |
| Simultaneous audio frequencies | 2–8 (to 40,000 Hz) | Amplifies all 8 |
| Simultaneous RF frequencies | 2 (to 20,000,000 Hz) | Amplifies GB4000 output |
| Programmable channels | 2,000 · 875 pre-programmed | N/A |
| Frequencies per channel | Up to 48 | N/A |
| Frequency display | Yes — on-screen | LED RF indicator only |
| Waveforms | Square · pulsed square · sine · Hoyland | Amplifies GB4000 output |
| Square wave duty cycle | 10–100% | Amplifies GB4000 output |
| Gating / pulsing | 1–5,000 Hz · 10–90% duty | Amplifies GB4000 output |
| Frequency sweeps | 1 Hz – 20,000,000 Hz | Amplifies GB4000 output |
| Channel sweeps | 2–20,000 Hz | Amplifies GB4000 output |
| Harmonic sideband frequencies | Yes | Yes |
| Circuit technology | Solid-state electronics | Solid-state electronics |
| Size | 8"W × 9.5"L × 4"H | 8"W × 9.5"L × 4"H |
| Weight | 2 lbs (0.9 kg) | 2 lbs (0.9 kg) |
| Factory tested and calibrated | Yes | Yes |
| Hand assembled | USA | USA |
| Warranty | 2-year | |
One order. Everything included.
Most distributors make you source the generator, accessories, and frequency list book from separate suppliers. We ship everything together as one complete, tested kit from New Zealand.
Good · Better · Best
GB4000 alone
The best standalone contact frequency generator on the market. Complete and powerful as a starting point.
GB4000 + SR4 ← You are here
The most powerful contact frequency system available. 15W, multiple users, everything in one NZ kit.
GB4000 + M.O.P.A.
The non-contact, hands-free option. 190W plasma tube output over 30+ feet. No electrodes required.
See the M.O.P.A. combo →Ready to order, or want to compare first?
The SR4 combo is our most popular system — powerful contact delivery for single or multiple users, all in one complete kit from New Zealand.