Solid State Logic VHD+ Pre 500 Series Manual

Solid State Logic Modtager VHD+ Pre 500 Series

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Introduction
Congratulations on your purchase of this API 500 format compatible
SSL VHDTM Pre Module.
This module has been specically designed to operate in a 500 format
rack such as the API lunchbox® or equivalent. In common with many
such modules, the nominal input/output level is +4dBu.
The VHD Pre is an immensely versatile recording and processing
device. It can deliver ultra clean SSL SuperAnalogue TM grade
recordings but also features a switchable VHD mode. SSL’s patented
Variable Harmonic Drive (VHD) system uses a 100% analogue signal
path to generate rich harmonic distortion. As you increase VHD input
gain, the Variable Harmonic Drive process introduces either 2nd or 3rd
harmonic distortion or a blend of the two to your source material. At
lower gain settings it adds gentle valve-style warmth or a touch of
transistor edge. As the gain is increased the more extreme the
distortion becomes until at high gain settings it delivers erce trashy
transistoresque grunge.
Operation
Please refer to the illustration opposite.
Signal LED➊
The signal LED is a tri-colour LED that indicates level according to the
following table.
* The LED scale is selected from a jumper on the module PCB.
Gain Controls➋
The red pot provides up to +75 dBs of gain, whilst the black pot
provides a variable mix of 2nd to 3rd harmonics (once the VHD-IN
switch ➌ is engaged).
The grey pot provides +/- 20dB of trim. Use this to control the output
when driving the VHD preamplier circuit.
High Pass Filter ➍
The High Pass Filter section is a switchable 18dB/Octave variable
lter. See the block diagram for the position in the circuit.
Switch Functions ➎
HI-Z Switches the preamplier impedance from 1.2KΩ to
10KΩ
+48v Applies phantom power, a tell tale red LED indicates
phantom power is active.
PAD Applies 20 dBs attenuation before the signal enters the
preamplier.
Ø Polarity switch inverts the polarity of the signal by 180°.
Using the preamplier
When the VHD button is not engaged, the preamplier has been
designed to give a transparent sound, great for sources such as
acoustic guitars, vocals and strings.
When the VHD button is pressed, the preamplier can be driven to
give a wide-range of overdriven sounds, ranging from subtle to... well,
not so subtle! Drums and electronic instruments can oen benet
from VHD colouration.
The best way to drive the VHD preamplier is to increase the input
gain (red pot) whilst using the Line Trim pot to reduce the overall level
and not clip the channel output. Remember, it’s the input to the
preamplier that likes being driven. From this point, adjust the
harmonics to ne-tune the desired sound.
Block Diagram
Signal LED
VHD In
Switch
High Pass
Filter
Gain Controls
➌
➊
➍
➋
Switch
Functions
➎
LED colour
LED colour
LED colour
LED colourLED colour +24dB Sc
+24dB Sc
+24dB Sc
+24dB Sc+24dB Scale*
ale*
ale*
ale*ale* +18dB Sc
+18dB Sc
+18dB Sc
+18dB Sc+18dB Scale*
ale*
ale*
ale*ale*
Green -24dBu -24dBu
Yellow +4dBu 0dBu
Red +21 dBu +16dBu

Produkt Specifikationer

Mærke: Solid State Logic
Kategori: Modtager
Model: VHD+ Pre 500 Series

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