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2-4. Using the link switch
Turn on the link switch if you want to use stereo compression.
When you're recording a stereo source, and the level of one channel rises
to the point where compression is being applied to only that one
channel, then the relative volume of the other channel will increase,
producing the impression that the stereo image has shifted to one side.
In such cases, turning on the link switch will automatically apply
compression to both channels at the same time, whenever either channel
reaches the compressor's threshold level.
So that the compressors for both channels will function in the same way,
select the same compressor mode setting for both channels (either Fast
or Slow). You should also set the compressor sensitivity knob to about
the same setting for both channels.
3. A note about the vacuum tubes
This device contains vacuum tubes. We recommend that you allow the
tubes to warm up for about ten minutes after you turn on the power,
before you begin running any audio signals through the TPB-2.
If you begin using this device immediately after turning on the power,
this may cause malfunctions and/or shorten the life of the vacuum
tubes.
In order to maximize reliability, avoid placing this device above or
below heat-producing equipment such as a power amp.
Do not attempt to remove, replace or change the tubes in the TPB-2. The
tubes are not a user serviceable part.
Vacuum tubes generate heat. Do not allow your skin to contact the vacuum
tube cover for an extended period of time. Doing so can cause low-tempera-
ture burns.
TPB-2 [ Tube Preamp Option ] for D32XD/D16XD
INPUT
9
PHANTOM
+48V
10
INPUT
PHANTOM
+48V
HI-Z
PAD
HA
LOWCUT
PHASE
HI-Z
PAD
HA
LOWCUT
PHASE
4. Specifications
Input connectors:
Input impedance:
Nominal level:
Maximum level:
Source impedance: ..................................................................................... 600
Vacuum tubes used: ................................................................................. 12AX7
Compression method: Vacuum tube compression using a photocoupler
Principal specifications
Frequency response:
S/N: ............................................................................................. 93 dB (typical)
GAIN
LEVEL METER
TRIM
GR
AD
TUBE
COMP
SENS
LINK
GAIN
LEVEL METER
TRIM
GR
TUBE
AD
COMP
SENS
XLR-3-31 type (+48 V phantom power, switchable),
1/4" TRS phone jack (balanced / unbalanced is Hi-Z)
4 k (XLR-3-31), 10 k (TRS phone Jacks),
1 M (TRS phone Jacks is Hi-Z)
–60 dBu to –12 dBu @ TRIM=max. — min PAD OFF
–34 dBu to +14 dBu @ TRIM=max. — min PAD ON
–48 dBu to 0 dBu @ TRIM=max. — min PAD OFF
–22 dBu to +26 dBu @ TRIM=max. — min PAD ON
Hi-Z
– 48 dBu to 0 dBu @ TRIM=max. — min PAD OFF
– 22 dBu to +12 dBu @ TRIM=max. — min PAD ON
10 Hz - 20 kHz ±1 dB @ fs 44.1 kHz, +4 dBu, 10 k load
10 Hz - 22 kHz ±1 dB @ fs 48 kHz, +4 dBu, 10 k load
10 Hz - 44 kHz ±1 dB @ fs 96 kHz, +4 dBu, 10 k load
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