A Whole New Vintage.
The Shelford Channel is built around Rupert Neve’s first new transformer-gain, class-A microphone preamplifier in over 40 years, a “best-of-the-classics” inductor EQ section, a tone-packed diode bridge compressor, the power of variable Silk saturation, a new custom transformer output stage, and twice the operating voltage of vintage designs.
Like Rupert’s designs from his time in Little Shelford , the Shelford Channel’s preamplifier uses a directly-coupled transformer input with gain provided by the custom transformer itself – a first in over 40 years for Rupert Neve. This new custom-designed input transformer, along with its careful integration with the surrounding class-A circuitry, is critical to the Channel’s bold and instantly recognizable character.
Conveniently, the Direct Input uses the same topology as the best-selling RNDI Active Transformer Direct Interface, providing astonishing clarity for high-Z instrument signals, with unparalleled low-frequency response and an incredibly smooth high end.
 
SPECIFICATIONS
 
MIC PREAMP
INPUT IMPEDANCE
2200 Ohm
MAXIMUM INPUT LEVEL
+21.5 dBu from 150Hz to 22kHz
+8 dBu 20Hz to 22kHz
NOISE
Un-weighted, 22Hz - 22kHz, source impedance 150 Ohm balanced.
Line Out (Unity Gain) -100.9 dBu
-6dB Out (Unity Gain -106.6 dBu
Line Out (+30dB Gain) -91.37 dBu
Line Out (+66dB Gain) -64.1 dBu
Equivalent Input Noise -121.37 dBu
FREQUENCY RESPONSE
17Hz to 45kHz: +/-0.25 dB
DIRECT INPUT
MAXIMUM INPUT LEVEL
+8 dBu from 20 Hz to 120 kHz
NOISE (LINE OUT)
-100 dBu (22Hz to 22kHz)
LINE INPUT
MAXIMUM INPUT LEVEL
+30.5 dBu from 20Hz to 30kHz
TOTAL HARMONIC DISTORTION AND NOISE
@ 1 kHz, +20 dBu output level, no load: Better than 0.002%
@ 20 Hz, +20 dBu output level, no load: 0.05% Typical (2nd and 3rd harmonic)
NOISE (MAIN OUTPUT)
Un-weighted, 22Hz - 22kHz, source impedance 40 Ohm balanced, no load.
-101.1 dBu
FREQUENCY RESPONSE
<10 Hz to 110 kHz: +/- 0.25 dB
120 kHz: +/- 0.32 dB
MAXIMUM OUTPUT LEVEL
16Hz to 20kHz: +26 dBu
TOTAL HARMONIC DISTORTION AND NOISE WITH SILK ENGAGED
SILK RED
MIN TEXTURE @ 100 Hz, +20 dBu input level, no load: 0.0131%, mostly 3rd harmonic (typical)
MAX TEXTURE @ 100 Hz, +20 dBu input level, no load: 1.66%, mostly 2rd harmonic (typical)
SILK BLUE
MIN TEXTURE @ 100Hz, +20 dBu input level, no load: 0.0079%, mostly 3rd harmonic (typical)
MAX TEXTURE @ 100Hz, +20 dBu input level, no load: 0.941%, mostly 2rd harmonic (typical)
HIGH PASS FILTER
Continuously variable swept frequency from 20 Hz to 250 Hz.
Slope: 12 dB/Octave
EQ NOISE
Un-weighted, 22 Hz-22 kHz: -92 dBu
SIGNAL PRESENT
Illuminates GREEN when input stage signal level reaches -20 dBu
OVERLOAD INDICATOR
Illuminates RED when input stage signal level reaches -23 dBu
DIODE BRIDGE COMPRESSOR SECTION
COMPRESSOR NOISE (BW 22 Hz – 22 kHz)
0dB Makeup Gain: -84.5 dBu
+20dB Makeup Gain: -64.2 dBu
TIME CONSTANTS
Note: Time Constant (TC) measurements taken represent full range achievable between 1.5:1 and 8:1 ratio set- ting, 0 dBu I/P 1kHz burst tone used for all recorded measurements 
Fast (TC1): Attack 180µS — 1.8mS // Release 100mS – 150mS
Medium Fast (TC2): Attack 750µS – 5.25mS // Release 160mS – 250mS
Medium (TC3): Attack 2.7mS – 18mS // Release 350mS – 525mS
Medium Slow (TC4): Attack 4.6mS – 38mS // Release 600mS – 1 S
Slow (TC5): Attack 11mS – 72.5mS // Release 800mS – 1.25 S
Auto (TC6): Attack 5.75mS – 35.5mS // Dual Release: T1 500mS, T2 1S
’FAST’ Mode: Speeds up all compressor time constants by 30%
PRODUCT DIMENSIONS
19” (48.3 cm) x 10.5” (26.7 cm) x 1.75” (4.5 cm)
SHIPPING DIMENSIONS
24” (61 cm) x 13” (33 cm) x 4” (10.2 cm)
SHIPPING WEIGHT
12.25 lbs. (5.5 kg)