Rupert Neve Shelford 5052: Mic Pre / Inductor EQ - Manual (Page 5)

Power Requirements
Each Portico 5052 is fitted for use with a specialized stand alone, multi-unit power
supply modules. The power supplies feature a proprietary 4 pin polarized input for
+24 and -24V DC power input, and come in 5-way and 25-way options. The 5-way
is an 8”x5”x5” brick, & 25-way is a 2U rack-mountable supply.
5052 Design Notes
The Shelford 5052 echoes the simple and definitive 1073 feature set with a
vertically-oriented mic pre, high pass filter, and 3-band inductor EQ, while also
incorporating modern capabilities like the variable Silk / Texture control from the
Portico II Series and simultaneous pre / post “tape” operation. Utilizing class-A,
discrete, +/- 24V topologies with custom-wound transformers and inductors, Rupert
Neve designed the 5052 as a vintage-style channel strip that captures the soul of his
classic designs, without the previous compromises.
Traditional transformer coupled inputs and outputs are used for both technical
performance reasons and optimum musical reproduction. All of the signal paths
use class-A gain blocks; using as few of these as possible to get the job done. By
combining this minimalisitic design aesthetics with class-A gain blocks and custom
transformers, the 5052 provides the extraordinary performance and musicality
expected from a Rupert Neve design.
Like Rupert’s designs from his time in Shelford, the 5052 preamplifier has 72dB of
discrete, class-A gain coupled with serious square-core transformers. Unlike the
classics however, the output transformer features the Silk Red / Blue and Texture
controls from the Portico II Series to hone the harmonic content and tonality of the
output stage. By engaging these controls and sufficiently driving the output, the
5052 can produce up to 4-5% THD (primarily 2nd order, some 3rd order), bringing
a richness and thickness to tracks when desired with no danger of overloading
5052:
Back Panel 5052: Block Diagram
0 - 66dB
-IN
OUT PUT STA GE
OUTP UT TR ANS FOR MER
20Hz - 250Hz
HPF
+/-6dB
T RIM
PHNT M
PHA SE
L evel Meter
+IN
HPF ENGA GE
ST E PPE D GA IN
CO NT IN UOUS TRIM
+48VDC
2 1
4
3
G
MI C OUTPUT
2
3
4
1
MI C INPUT
2
3
4
1
LI NE INPUT
2
3
4
1
EQ NPUT
INPUT TR ANS FOR MER
MIC/ L IN E
OUT PUT STA GE
OUTP UT TR ANS FOR MER
SIL K
RE D/BL UE
T E X T URE
2 1
4
3
G
MAI N OUTPUT
T L A
T O EQ
MID EQ HI & LO SHE L V E S
E Q ENGA GE
T O EQ