low-noise circuitry with 12 active tube stages provides 2 channels of exceptional equalization and
Designed to complement the widely acclaimed Drawmer 1960 Mic Pre-Amp Vacuum Tube Compressor, the 1961
Vacuum Tube Equalizer combines low-noise circuitry with no fewer than twelve active tube stages to provide two channels of
exceptional equalization possessing unique 'personality'. Rather than employ a continuously variable resistor as a means of
frequency control, the 1961 utilizes the same rotary 'step' switching system used in vintage designs . This enables the component
values for each frequency band to be optimized for uncompromising performance across the entire audio spectrum and also makes
setting up more accurate, particularly when treating stereo signals.
The design of the 1961 allows the user to control
the amount of 'warmth' by deciding how hard to drive the tubes giving a sound as 'clean' as the best discrete solid state
designs or as 'hot' as the 'hottest' classic tube designs. The 1961 and 1960 Can be 'interlinked' to provide, in effect, a
two channel vacuum tube mixing console, - the perfect mastering or post audio 'sweetening' tool.
Facilities available on the 1961 include:
A variable input level of -20dB to +20dB ensures compatibility with a wide range of input source material and enables the
user to optimize signal level and drive the tubes 'soft' or 'hot' as required. LED bargraph displays give a clear indication
of the input signal level.
High Pass Filter
A variable 12dB/Octave roll-off filter adjustable from - 15Hz to 500Hz section enables the user to remove unwanted low frequencies
and sub-sonic noise.
Each channel of the 1961 has four main equalizer sections with six carefully chosen overlapping frequencies and a separate
tube stage for increased harmonic clarity. Each section also includes variable band width from 0.3 Octave to 3 Octaves and
+18dB of Cut and Boost.
BASS frequencies (Hz) 20, 32, 50, 80, 125, 200_LO-MID frequencies (Hz) 100,180, 250, 400, 650,1K_HI-MID frequencies (kHz)
0.5, 0.8,1.2, 2.0, 3.2, 5.0_TREBLE frequencies (kHz) 2.5, 4, 6,10,15, 25
Low Pass Filter
A variable 12dB/Octave roll-off filter adjustable from 2.5kHz to 56kHz enables the user to remove high frequency interference
or to band limit excessively high levels of high frequencies.
Two additional tube stages in the output section of each channel allow the user to achieve 'soft clipping' by adjusting the
input level control whilst visually monitoring the effect upon the 'Soft' and 'O/L' (Overload) LED's.
In addition to a master bypass switch for each channel each of the parametric and shelving filters has its own separate bypass
switch. This not only makes the 1961 very straight forward to set up, by allowing instant A-B comparison ,but also enables
the tube output stages to be used to add tube coloration without EQ simply by leaving each channel switched to 'In' and each
individual EQ sections switched to 'Out' The master bypass switch for channel bypasses all the filter sections as well as
the output stage vacuum tube circuitry.
Levels of -10dBu and +4dBu are selectable using a rear panel switch.
Insert point 1/4" jack connectors on the rear panel enable direct connection to the Side chain or Insert points of the Drawmer
1960 Mic Pre-Amp/ Vacuum Tube Compressor. The 1961 and 1960,when'interlinked', produce a powerful package for recording signals
direct to tape; gain control, EQ and compression can be applied to both mic and line level signals without having to go via
a mixing console.
Inputs and outputs
The 1961 is provided with balanced inputs and outputs on XLR connections.
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Drawmer 1961 Vacuum Tube Equalizer Specifications:
- (All measurements taken at +4dBu operating level)
- INPUT IMPEDANCES: XLR 20K Ohm, INSERT 47K Ohm
- MAXIMUM INPUT LEVEL: +17dB (+21dBu)
- OUTPUT IMPEDANCES: XLR 50 Ohm_INSERT 200 Ohm
- FREQUENCY RESPONSE: <22Hz to 42KHz -1dB:
- CROSSTALK: <-80dB @ 10KHz <-75dB @ 20Khz
- INPUT CMR: Better than 40dB (20Hz to 10KHz)
- OUTPUT BALANCE: Better than 40dB (20Hz to 10KHz)
- NOISE AT UNITY GAIN with flat EQ response switched in circuit:
- Wideband 22Hz - 22KHz CCIR ARM IEC A Q-Pk CCIR
- AV -87dB -94dB -96dB -97dB -85dB
- RMS -85dB -92dB - -95dB -
- DISTORTION: @ 1Khz
- XLR Input with BYPASS selected < 0.1%
- XLR Input with NORMAL selected < 0.3%
- POWER REQUIRED: 115 Volt or 230 Volt AC at 50-60Hz, 28 Watts
- FUSE RATING: 250mA for 230 Volt, 500mA for 115 Volt
- CONFORMING TO BS EN 60127-2:1991 SHEET III
- FUSE TYPE: 20mm x 5mm, Class 3, Time delay, 250 Volt working
- CASE SIZE: 482mm (w) x 88mm (h) x 250mm (d)
- WEIGHT: 6.1 Kgs