The SR4 RF Amplifier is a perfect companion for your GB4000. When you add the SR-4 to your frequency machine, you immediately multiply your maximum power output by 5X.

| # | GB4000 | SR-4 |
|---|---|---|
| RF or EM Method | RF Method. Used on original machines. | RF Method. Used on original machines. |
| Frequency Range in Hertz | 20,000,000 Hz (1 to 20Mhz) | 20,000,000 Hz (1 to 20Mhz) |
| Modulation Frequency Range | 1 to 400,000 Hertz at 100% modulation | 1 to 400,000 Hertz at 100% modulation |
| RF Carrier Sine Wave | Fixed 3.1 Mhz (3,100,000 Hertz) | Amplifies GB-4000 output from 1 to 15 watts. |
| Digital or Analog output | Uses a Digital Signal Processor, then converts to analog before output amplification | Amplifies GB-4000 output from 1 to 15 watts. |
| Frequency Sweeps with user defined ranges | 1 to 20Mhz (1 to 20 million herz) | Amplifies GB-4000 output from 1 to 15 watts |
| Greates power absorption range | Direct Contact | Direct Contact |
| Output Power Level | Variable, 2 modes: Audio Mode - 0.75 Watts (38 VPP) RF Mode - 3.7 Watts (115 VPP) The user has complete control of output intensity | Variable - 1 to 15 Watts in RF Mode. |
| Audio Contact Method | Electrodes (Metal hand cylinders, footplates) | Electrodes (Metal hand cylinders, footplates) |
| RF Contact Method | Electrodes (Metal hand cylinders, footplates) | Electrodes (Metal hand cylinders, footplates) |
| Output Resolution | Ouput fractional frequencies - 0.01 resolution. | Ouput fractional frequencies - 0.01 resolution. |
| Output Single Frequencies | Yes | Yes |
| Multiple Audio Frequency Output | The only instrument capable of running 1 to 8 frequencies simultaneously to 40,000 Hertz without frequency degredation. | Amplifies GB-4000 output from 1 to 15 watts |
| Multiple RF Frequency Output | 2 RF frequencies from 40,001 Hertz to 20 Mhz | Amplifies GB-4000 output from 1 to 15 watts |
| Additional Power for Simultaneous Frequencies | 3.7 watt output is 37 times more powerful than other machines. Ample power for multiple frequencies | Up to 15 watts |
| Programable Channels | 2,000 channels available. 875 channels are pre-programmed. Over 8,000 frequency sets available | Amplifies GB-4000 output from 1 to 15 watts |
| Displays actual frequencies | Yes | No |
| Waveforms | Squarewave, Pulsed Squarewave, Sine, and Hoyland | Amplifies GB-4000 output from 1 to 15 watts |
| Squarewave duty cycle | Variable from 10% to 100% | Amplifies GB-4000 output from 1 to 15 watts |
| Gating or Pulsing | Variable from 1 to 5,000 Hertz | Amplifies GB-4000 output from 1 to 15 watts |
| Gating or Pulsing Duty Cycle | Variable from 10% to 90% | Amplifies GB-4000 output from 1 to 15 watts |
| Frequency Sweeps | User defined sweep range from 1 to 20 Mhz | Amplifies GB-4000 output from 1 to 15 watts |
| Channel Sweeps | User defined sweep range from 2 to 20,000 Hertz | Amplifies GB-4000 output from 1 to 15 watts |
| Harmonic Sideband Frequencies | Yes | Yes |
| Factory Tested and Calibrated | Yes | Yes |
| Hand Assembled in USA | Yes | Yes |
| Frequency Technology | Solid-state electronices | Solid-state electronices |
| Size and Weight | 8" W X 9.5" L X 4" H, 2 pounds | 8" W X 9.5" L X 4" H, 2 pounds |