Each ocatve is a bandpass filter using one half of a 12AX7 triode with the center frequency finely tuned by an RC network.
As with all our gear, the power supplies are regulated DC. For B+, we actually use a 6X4 rectifier tube followed by a regulated B+ circuit based around the LR8 high voltage regulator. This ensures a rock steady and ultra low noise B+ supply.
DC filament too is regulated at 6.3VDC, again, rock steady and ultra low noise!
Power is provided by our own designed power transformer custom made for us by Heyboer Transformers.
Only high quality components are used in the construction of Natalie. Low-noise +/-1% variation metal film resistors are used throughout the signal circuit. Film capacitors or no more than +/- 5% variation and for the all important power supply Nichicon electrolytic capacitors are used.
The printed circuit boards are designed in house , manufactured to FR4-TG standards, and are double-layer with full ground planes on both sides to ensure complete screening of the circuits.
Tubes are factory new 12AX7, NOS 5693 and NOS 6X4.
Each octave is adjustable bewteen -14dB and +14dB cut and boost.
Frequency response is 20Hz to 20KHz
Input impedance is 100K @ 1KHz, output impedance is around 20K @ 1KHz
Max input 1.5V RMS
Less than 1% harmonic distortion
1.5V out @ max attenuation
Power: 120-125VAC 60Hz; can be wired for 220-240VAC 50Hz on request
Power consumption: 45W @ 120VAC
Chassis size: 3U high, standard rack mount width