INTRODUCTION
The T L Audio Ml Tube Console combines classic valve techniques with low noise
solid state circuitry to construct a mixing console offering high specification signal
paths with the unique valve sound quality. 8 or 12 input channels are provided, all with
mic and line inputs, switchable 48V phantom power, three band EQ, balanced
insertion send and return, 2 Aux sends, Pan and lOOmm Fader. Each channel also
features a balanced Direct Output, which is pre EQ and independent of the channel
fader.
Mixing is via balanced busses to valve mix amplifiers. The stereo output is controlled
by a stereo lOOmm fader, and monitored by illuminated moving coil VU meters. A
stereo effects return, two 2-track returns and independent headphone output complete
the monitoring facilities.
The M 1 Tube Console is an ideal compliment to a digital audio workstation, but may
also be used for direct to stereo recording, as outboard analogue EQ during mixdown,
and as a complete studio, stage or PA mixer. The console is table-top mounting and
supplied with a free standing power supply. There are no fans in either the power
supply or console.
The block diagram of the M I Tube Console is shown in fig. 1. A discrete solid state,
electronically balanced input amplifier is used, to achieve state of the art performance
with very low noise, low distortion and wide bandwidth. The mic input is via an XLR
socket and is suitable for low impedance (150-600 ohm) microphones, with a gain
control range of + 16 to +60dB plus a 30dB pad. A front panel switch selects 48V
phantom power. The line input has an effective overall gain range of -20 to +20dB,
allowing the valve stages to be fully driven from line level signals in the range -20 to
+20dBu. The input stage is directly coupled to a second stage triode valve amplifier.
Increasing the gain at the input stage allows the unique overdriven valve sound to be
gradually introduced, as indicated by the "Drive" and "Peak" LEDs. Phase reverse and
90Hz high pass filter switches complete the input section.
A balanced insertion point is provided enabling the connection of external equipment
(a compressor, for example) into the channel. The insert send socket may also be used
as an independent output. The Direct Output from the channel is pre-fade and
balanced. It is taken after the valve stage, insertion point and EQ, but is unaffected by
the channel fader.
The equaliser section provides shelving LF and HF filters and swept frequency mid
peaking filter. The EQ stages may be bypassed for easy A-B comparison.
Mixing to the stereo bus is via 100mm linear faders with rotary pan control. PFL and
channel MUTE switches are also provided. Two Aux sends are available; Aux 1 is
switchab1e pre or post fade, with Aux 2 permanently post fade. The stereo return can
also send to Aux 1. The busses are balanced, with hybrid solid state / triode valve mix
3
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