Rubber Bands
Stereo ‘Pultec Style’ Tube Equalizer
A Stereo Passive EQ with Classic Roots
Rubber Bands draws inspiration from the legendary EQP-1 Pultec design, bringing the unmistakable behavior of passive equalization into a modern, stereo format. Carefully selected components with 1% tolerance ensure precise channel matching and consistent stereo imaging.
Organic Amp Tube Amplification
Following the passive filter stage is the Organic Amp, a specially designed two-stage tube amplifier that restores gain while adding density, depth, and harmonic richness. This tube stage is central to the Rubber Bands sound, enhancing dimensionality without masking detail.
Musical Filter Interactions
The equalizer is divided into four sections: two dedicated to bass and two to treble. Frequencies are selected via stepped switches, while boost and cut controls remain continuous. The interaction between filters allows simultaneous boosting and cutting of similar frequencies, producing the signature Pultec-style curves engineers rely on.
Designed for Real-World Mixing
A relay-based bypass enables instant A/B comparison, making Rubber Bands intuitive during critical sessions. It shines on vocals, guitars, strings, and full mixes, adding authoritative low end and smooth, airy high frequencies.
Specifications
| Stepped Manipulators | Yes, for frequency selection |
| Boost / Cut Range | ±15 dB |
| Hard Wire Bypass | Yes |
| Q Factor | 0.5 – 4 |
| Audio Transformers | Yes, Carnhill (input) and Edcor (output) |
| Input Impedance Balanced |
10 kΩ, Carnhill transformer |
| Output Impedance Balanced |
600 Ω, Edcor transformer |
| Operating Level | +4 dBu |
| Maximum Input Level | +18 dBu |
| Maximum Output Level | +22 dBu |
| Dynamic Range | 95 dBA @ 1 kHz, +18 dBu |
| Frequency Response | 20 Hz – 20 kHz ±0.3 dB |
| Signal-to-Noise Ratio | 81 dBA |
| THD | 0.25% @ 20 Hz – 20 kHz |
| THD+N | 0.33% @ 20 Hz – 20 kHz |
| IMD (SMPTE) | 0.32% @ 20 Hz – 20 kHz |
| Crosstalk | 80 dB @ 20 Hz – 20 kHz |
| Voltage | 115 / 230 V AC, 50–60 Hz |
| Power Consumption | 34 W |
| Power Supply | Internal |
| Dimensions | 70 × 50 × 30 cm |
| Shipping Weight | 5 kg |
| Tube Complement | 4 × 6N1P (optional: 6BC8 or 6BC7) |