Coming Soon
Introducing The Hazelrigg Industries D Series
All the D. W. Fearn and Hazelrigg Industries goodness you know and love in three 500 series format modules: DVA Vacuum Tube Microphone Preamplifier/DI, DLC Vacuum Tube Inductor Equalizer, DNE Pulse Width Modulation Compressor.
DVA Vacuum Tube Microphone Preamplifier/DI
The DVA is a hybrid microphone preamplifier based on the Hazelrigg Industries VLC and D.W. Fearn VT-1 preamp. Utilizing a single 6072a vacuum tube, the input circuitry matches the VLC/VT-2 input stage exactly and features transformers in both the input and output stages.
Make-up gain is provided by a low-THD/high output solid state signal path (as opposed to thevacuum tube circuits in the VLC/VT-2) due to the module size and power supply limitations inherent in the 500 series format. Total gain available is approximately 60db.
User tips: Many condensers have a high output and require an input pad to avoid overloading the input transformer. If needed, we suggest using the pad on the microphone if available.
Users looking for ‘saturation’ can try engaging the -20 db pad and sending the DVA an attenuated signal, then adjust gain for tone and output.
Vacuum Tube Microphone Preamp (6072a)
Vacuum Tube DI (6072a)
Amplifier Designed By D.W. Fearn
7 Year Warranty (90 Days For Vacuum Tubes)
Transformers in Both Input and Output Stages
Front Panel Microphone/Instrument Input
Output Indicator LED
Polarity Reversal Switch
-20dB Pad Switch
+48V Phantom Power Switch with LED indicator
High Pass Filter Switch
DLC Vacuum Tube Inductor Equalizer
The DLC is based on the passive equalizer circuit in the Hazelrigg Industries VLC (originally foundin the D.W. Fearn VT-5). It shares the same filter capacitors and handwound inductor as the VLC, though the audio path is slightly different. The input audio circuit comes from the D.W. Fearn VT-2, while the output uses a low THD/high gain solid state amplifier design. Like the VLC, the DLC uses transformers in both input and output stages.
User tips: Boosting and cutting simultaneously can create complex equalization curves. Try turning up all knobs except the bass boost, switch frequencies to the desired settings, then bring the bass boost up until the sound is balanced.
Vacuum Tube Input Stage (6072a)
Hand-wound Inductor
Amplifier and EQ Circuits Designed By D.W. Fearn
7 Year Warranty (90 Days For Vacuum Tubes)
Transformers in Both Input and Output Stages
Front Panel Microphone/Instrument Input
High Cut Control
High Boost Control
Low Boost Control
Low Cut Control
High Cut Freq. Select Switch
High Boost Freq. Select Switch
Low Boost Freq. Select Switch
Low Cut Freq. Select Switch
Bypass Switch
DNE Pulse Width Modulation Compressor
The DNE gets its compression circuitry directly from the Hazelrigg Industries VNE and D.W. Fearn VT-7. Attack and release times have been optimized to simplify the user interface. The High Pass Filter (HPF) makes the compressor less reactive to low frequencies (for example, bass and kick).
Linking units require 500 series racks with a link option. Signal path utilizes input and output transformers and low-THD/high-gain solid state devices. Gain reduction is shown with LEDs User tips: The PWM methodology is capable of extremely fast attack and release times.
User Tips: When compressing bass-oriented instruments, it is possible to have audio artifacts when the release is set too fast. This is usually not an issue on program material.
When linking units, attack and release times will be averaged. Units do not have to be set exactly the same. However, keep in mind that if the threshold is not turned up on a DNE, the side chain won’t reference the audio passing through the unit, even though it may be compressing it if linked.
PWM Circuit Identical to VT-7 / VNE
Linkable for Stereo Operation
Streamlined Interface for Fast, Intuitive Control
7 Year Warranty
Transformers in Both Input and Output Stages
Attach Time Selector Switch–Fast/Slow
Release Time Selector Switch–Fast/Slow
Threshold Control
Output Indicator LED
LED Gain Reduction Meter
High Pass Filter Switch
Link Switch
Makeup Gain Control
Bypass Switch