Due to many requests, we are re designing Natalie with 10 octaves per channel.
The revised frequencies are more inline with modern standards/requirements, being 32Hz, 64Hz, 125Hz, 250Hz, 500Hz, 1KHz, 2KHz, 4KHz, 8KHz & 16KHz. 
Each octave is a tube gyrator, using one half of a 12AX7 triode, then fed into differential pair and a 12AT7 based cathode follower output stage.
There are a total of 14 tubes, 7 tubes per channel.
Each channel has its own pcb with an onboard regulated 12.6VDC for filament and a bi polar CRC B+ supply, powered by a pair of low noise toroidal transformers, one for filament and one for B+.

Cut & boost will be +/-12dB.

Natalie will be build in a Hammond 3U full depth chassis and will have 20 rotary frequency controls, EQ in/out switch, attenuator and power switch on the front panel. A mono will also be available.

Standard in and outputs are unbalanced RCA, however, optional XLR balanced in and outputs will be available.
The balanced in and outputs will use the excellent Lundahl LL1544A audio transformer.

We hope to have the new version of Natalie available in a few weeks.


Natalie Mono Option :

Natalie can be build as a mono version, below is a drawing of the front panel. This will be in a standard Hammond RMC series 2U rack chassis.
Please contact us for pricing and other details, thank you.
3U full depth Hammond chassis
+ XLR balanced in and outputs