®
TLAudio
user manual
Ivory 2 Series
5001
QUAD VALVE PREAMP
TL Audio Ltd, Letchworth, Herts, SG6 1AN, UK
email: info@tlaudio.co.uk web: http://www.tlaudio.co.uk
CONTENTS
1INTRODUCTION
2PRECAUTIONS
3INSTALLATION
3.1AC Mains Supply
3.2Audio Operating Level
3.3Microphone Inputs
3.4Instrument Inputs
3.5Balanced Outputs
3.6Unbalanced Outputs
3.7Ventilation
3.8Rear Panel
4 OPERATION
4.1Front Panel
4.2Microphone Inputs
4.330dB Pad
4.4Phantom Power
4.5Input Gain
4.6Drive and Peak LEDs
4.790Hz Filter
4.8Phase Reverse
4.9Instrument Input
4.10Output Level
4.11Optional DO-4 Digital Output Card
5GETTING STARTED
6SPECIFICATIONS
7SERVICE
1.INTRODUCTION
Congratulations on purchasing the Ivory 5001 Quad Valve Preamp by TL Audio!
The T L Audio Ivory 2 Series consists of a range of hybrid valve signal processors, which utilise low noise solid state electronics in conjunction with classic valve circuitry to produce audio processing units offering very high quality signal paths with the unique valve audio character. The Ivory 2 Series units offer comprehensive control facilities, whilst remaining straightforward to operate, and represent excellent value for money.
The 5001 Quad Valve Preamp is a four channel discrete valve microphone preamplifier that also offers an instrument DI input on each channel. Featuring very low noise and an exceptionally wide bandwidth, the 5001 provides continuously variable input and output gain controls, 30dB pad, 90Hz high pass filter, phase reverse and independently switched +48V phantom power.
The block diagram of one channel of the unit is shown in Fig.1. The microphone input is via a balanced XLR connector, with phantom power applied via a front panel switch. The gain of the input stages is controlled by a continuously variable rotary control, providing between 16 and 60dB of gain on the mic input. A switchable 90Hz high pass filter (12dB per octave) is provided to reduce unwanted background low frequency noise, such as traffic rumble or wind effects.
The second stage of the 5001 consists of a twin triode valve (vacuum tube) circuit. The characteristic valve sound may be subtly introduced or used to effect by increasing the input gain. A variable intensity yellow “Drive” LED monitors the input to the triode circuit to indicate the degree of valve “warming” that is being introduced. Four red LEDs show peak levels and are calibrated for +8dB, +12dB, +16dB and +20dB of output, making them ideal for monitoring levels into a digital recorder.
Phase reverse may be applied, before the output level control. The output level control allows gain matching to other integrated equipment (e.g. a mixing console or tape machine). The combination of input and output gain controls allows a degree of variation in the sound characteristics based on the operating level through the valve stages. Keeping the input gain low will produce a clean uncoloured sound, alternatively pushing the input gain will drive the valves and add the characteristic valve warmth to the signal. The output gain can be set accordingly without affecting the sound characteristics of the signal.
Each channel has a balanced XLR line level output at a nominal level of +4dBu, and an unbalanced jack output at a nominal level of -10dBu. Both are buffered from eachother and may be used simultaneously.
Finally, the optional DO-4 digital output card may be fitted which provides high quality A-D conversion of each channel output. The digital output is 24 bit SPDIF format (via two RCA phono connectors), with switchable sample rate between 44.1 & 48kHz. An external BNC wordclock input is also provided.
Please read this manual fully before installing or operating the 5001.
2.PRECAUTIONS
The TL Audio 5001 requires very little installation, but like all electrical equipment, care must be taken to ensure reliable, safe operation. The following points should always be observed:
-All mains wiring should be installed and checked by a qualified electrician,
-Ensure the correct operating voltage is selected on the rear panel before connecting to the mains supply,
-Never operate the unit with any cover removed,
-Do not expose to rain or moisture, as this may present an electric shock hazard,
-Replace the fuse with the correct type and rating only.
Warning: This equipment must be earthed.
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