Natalie has proven to be an excellent graphic equalizer doing its job with outstanding accuracy.
It uses one half of a 12AX7 triode for each frequency and the 5693 for the preamp section.
Circuit:
Each ocatve is a bandpass filter using one half of a 12AX7 triode with the center frequency finely tuned by an RC network.


Power Supply:
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.


Components:
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.


General specs:
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
Weight: 8lb


Specifications