A '73 For The Rest Of Us
If there’s one preamp-eq that professional engineers would
unanimously agree has defined the tone of pop/rock records for the last
50+ years, it would most definitely be the venerable 1073. The 1073 has
been massively used in recording and live applications for decades and
is still considered to be the “Holy Grail” of preamp-eq’s today. The
Warm Audio “WA73 Family” provides single and dual channel re-creations
of this classic British preamp (with & w/out EQ), that each pay
careful and humble homage to the original circuit.
When we at Warm Audio decided to release the WA73-EQ it was
imperative that the products pay respectful homage to the sacred British
console history in both design and performance. The tone and sweet
character that the vintage units impart is so unique and familiar, that
we had only the pure desire to release truly sonic accurate replicas.
After years of R&D, careful reverse-engineering, and countless hours
of auditioning, the WA73-EQ has been born!
The WA73-EQ is a “Desert Island” boutique preamp-eq, but it can also
be classified as a studio and live work-horse. The classic 1073 was
known for being a versatile tool that worked well with all kinds of
microphones from Condenser, to Dynamic, to Ribbon. The WA73-EQ equally
shines on all types of microphones and sources including; vocals,
acoustic/electric guitars, bass, drums, percussion, orchestras,
keyboards, and even as a tone shaping tool to run partial or complete
mixes through. With 80dB of gain, a fully discrete Carnhill Transformer
balanced signal path, and versatile 3 band inductor EQ, there’s no
recording, mixing or engineering task the WA73-EQ can’t handle.
Hand Wired & Hand Assembled
The classic 1073 was hand-wired and so is the WA73-EQ. Guru’s claim
that a portion of the 1073’s classic tone can be attributed to the
hand-wired nature of the build. The WA73-EQ is authentically hand-wired
and hand assembled, including the pcb components that are all populated
by hand.
UK Custom Carnhill Transformers
1073 enthusiasts unequivocally get excited about the component
history in these classic circuits. The signal transformers are a common
topic of conversation. The classic vintage units used various versions
of transformers throughout the years, and the most coveted were the very
first versions made by Marinair Radar. Marinair Radar Transformers are
regarded as the most desirable 1073 choice due to their fluid and
forgiving nature. They saturate sweetly when pushed, and have been known
to make engineers cry when they hear how beautiful their mixes sound
through them! Warm Audio worked closely with Carnhill Transformers of
Cambridgeshire, UK, to design faithful replicas of these most coveted,
early version transformers. We at Warm Audio have not yet heard a modern
day 1073-style preamp sound as close to the early vintage 1073 design
as does our WA73-EQ with these beautiful custom Transformers.
Capacitors & Signal Path
An important part of the classic British circuits not often discussed
are the different styles of capacitors and output transistor used. We
found it important to maintain integrity to the original design by using
tantalum and polystyrene capacitors in the signal path and an output
transistor choice that is much smoother in the high gain settings than
what is typically found in modern 1073-style replicas.
UK Blore Edwards Switch-Pots
A great sounding 1073-style circuit should be just as reliable as it
is great sounding. The complex dual concentric switch potentiometers in
the EQ section of the WA73-EQ are made in the UK by Blore Edwards who
manufacture military spec switches and potentiometers. The use of
Blore-Edwards components is no small inclusion for a 1073-style
preamp-eq in this price range.
Specifications
- Single Channel, Class A, 1073-style British Microphone Preamp with EQ
- UK made Carnhill Transformers
- UK made - Blore Edwards EQ dual-concentric switch potentiometers
- Hand Wired, hand assembled
- 80dB of gain - resistor stepped gain switch
- Fully discrete
- TONE button - Changes input transformer impedance for varying tone
- Polarity switch
- 48v phantom power
- Inductor based 3 band EQ
- Low Band Boost/Cut - 35, 60, 110, 220 Hz
- Mid Band Boost/Cut - 360, 700, 1600, 3200, 4800, 7200 Hz
- High Band Boost/Cut - 10, 12, 16 kHz
- Additional high band frequency EQ points added (compared to vintage 1073)
- 4 position inductor based hipass filter - 50, 80, 160, 300 Hz
- XLR mic inputs (front & back)
- Line level TRS input
- TS Send/Receive insert jacks
- XLR & TRS line level outputs
- Direct In, instrument input
- Output control
- Led level indication
- Freq response 20Hz - 20kHz +/-.5 dB
- 19" rackable
- Internal IEC 115v/230v power inlet