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Purple Audio

The Purple Audio Action features a constant impedance 600 ohm input attenuator feeding the input transformer, just like our MC77 units. This makes the input more resistant to overload by hot signals. After the input transformer, the signal is attenuated by the same gain reduction FET as in the MC77. The attenuated signal is buffered by our class A KDJ3 opamp, which feeds the output fader. Lastly, our class AB KDJ4 output opamp drives our custom hexafilar nickel and steel output transformer. The total gain (with no attenuation) is 45dB, just like the MC77.
 
The attack and release times cover a broader range than the MC77, which can cause distortion... which may or may not be what you are looking for. Use at extremes with caution. The ratios are the same as the MC77, and the threshhold moves up as the ratio goes up, just like the MC77.
 
In the center of the unit is an SMT sidechain and stereo link amplifier, below that is our SMT compression LED ladder meter driver. Behind that is the SMT input and output tricolor LED meter driver.
 
Stereo linking is accomplished by cross connecting pins 3 & 6 on the edge connector. On the Purple Sweet Ten, there is a second output XLR that can be used to link two Actions. The link is accomplished using a XLR-F to XLR-F cable with pin 2 on one XLR-F connecting to pin 3 on the other XLR-F and vice versa. Plug in the cable, flip the front panel switch and you are linked. Non-Purple racks do not have an easy way to connect pins 3 and 6, and will need modification to link two Action units.
 
The Purple Audio Action Features:<ul>

<li> Input attenuator feeding input transformer
 <li> Output level control
 <li> Input and output tricolor LED metering
 <li> Eight LED GR metering
 <li> Five ratios including "All buttons in" mode
 <li> Attack and Release controls
 <li> True Relay Bypass
 <li> Stereo Linking
 <li> Compression on/off switch
 <li> Discrete signal path
 <li> Over Current Resettable Fused (prevents any module problem from affecting your rack)
 <li> ROHS - Lead Free </ul>

Specifications:

<li> Total Gain: 45dBu
 <li> Ratios: 4:1, 8:1, 12:1, 20:1, ∞:1 ("All buttons in")
 <li> Attack time: Continuously Variable from over 800 microseconds to 20 microseconds
 <li> Release time: Continuously Variable from over 1.1 seconds to 50 milliseconds
 <li> Input impedance: 600 ohms
 <li> Output impedance: 600 ohms
 <li> Current consumption: 90ma </ul>

Purple Audio Action FET Compressor
Discrete FET "500 Series" compressor, reminiscent of the MC77

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The Purple Audio Biz Mk is a unique sounding, three amplifier, discrete microphone preamp module designed to work in standard "500" racks. The smooth Gain control helps you dial in the sound you want. If the output level is too high (the Class A/B output opamp can pump out up to +27 dBu), you can ride the level down with the separate Level control. Pressing the "Dual" switch splits the gain between two of our Class A opamps, enabling up to 75 dBu of clean gain, making the Biz a perfect match for ribbon microphones. With different Gain, Level, and Dual settings the Biz can produce an infinite variety of tonal variations with the same amount of output level. The front panel DI helps you record instruments and line level sources with unrivaled clarity and punch. Two LEDs clearly indicate signal level for the gain and output stages at a glance, turning green to indicate signal present, yellow for 10dB below clipping, and red for clipping. For easy serviceability and tweaking, the Purple discrete opamps can be replaced with any standard discrete opamp or a DIP-8 IC. The Biz uses our custom output transformer which provides two isolated outputs (when supported by the chassis). The Purple audio Biz Mk, the same Biz you love with two new features: 
<ul><li>Mic / Line switch for rack input Bridging line input for 
high output mics or line level sources Use with our Moiyn 8x2 mixer 
module in the Sweet Ten rack for mic or line mixing 
</li><li>DI Load switch for front panel input 33kohms as in the original Biz or 100kohms for a more open tone </li></ul>

Purple Audio Biz Mk
Three amplifier, discrete mic preamp module

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For easy serviceability and tweaking, the Purple discrete opamps can be replaced with any standard discrete opamp or a DIP-8 IC. The output amp stages in the Purple Audio Cans are modular, but cannot be replaced with any other opamp. The Purple Audio Cans Features: <ul><li>Discrete signal path</li><li>Capable of driving the most demanding phones</li><li>10kΩ Transformer balanced input</li><li>Hi-Z input will not load sources when multing</li><li>15dBu Gain</li><li>Individual channel cuts</li><li>Channel swap</li><li>Channel sum to mono</li><li>Precision matched stereo level control</li><li>Ships with XLRF to XLRF adaptor for stereo input</li><li>Unbalanced stereo front panel 1/4" TRS output</li><li>Second unbalanced stereo output on rear XLR in Purple Sweet Ten rack</li><li>Current consumption: 70mA</li><li>Over Current Resettable Fused (prevents any module problem from affecting your rack)</li><li>ROHS - Lead Free </li></ul>

Purple Audio Cans - Discrete Headphone Amplifier
A discrete stereo headphone amp that doubles as a control room preamplifier. Designed to work in standard "500" racks.

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The Purple Audio LILPEQr is Purple Audio's take on the classic program (aka final mix) equalizer. It offers high and low frequency shelving bands, each with three carefully selected corner frequencies to choose from, and a switchable fader knob for overall level control. The LILPEQr emulates the colorful 3D richness and useful responses of our favorite vintage tube (aka valve) program EQs (namely, the Lang PEQ-1 and the Klangfilm RZ062), but in a compact, solid-state format. The LILPEQr will add air, weight, and glue to an already balanced mix. Additionally you can also use the LILPEQr to immediately and intuitively alter the overall tone of an individual source. When the EQ is first switched in (center switch position - "IN" - LED off) your signal is injected passively into the tone network, directly following the input transformer. As with many classic program equalizers, this configuration allows for the ultimate in wide, lush, mix-buss response with extra "glue" and all that richness. Flip the switch one more click (upper switch position - "IN+Level" - LED red) to activate the buffered "Level" control. Placed in between the input transformer and EQ network, these discrete, class A buffers change the response ever so slightly, making the signal seem a bit tighter and more focused. This mode is more useful on individual sources within a mix. Relay true bypass (lower switch position - "BYP" - LED green) allows for easy before and after EQ comparisons, and a simple overall circuit path allows for wide bandwidth so that everything passes through... sounding better! In program mode ("IN"), with both EQ knobs centered, frequency response is +/- 0.5dBu from 20Hz to 20kHz, and extends below 10Hz and well beyond 120kHz before any drooping occurs. Features <ul><li>Big sound, small package</li><li>Major vibe, minimal interface</li><li>High Frequency shelf boost/cut 12dB at 5kHz, 10kHz, or 28.5kHz ("AIR")</li><li>Low Frequency shelf boost/cut 20db at 50Hz, 80Hz, or 160Hz</li><li>Switchable, buffered level control for overall volume adjustment</li><li>Relay True Bypass</li><li>Tricolor LED level meters</li><li>Transformer balanced in and out, with bridging 20kΩ input</li><li>100% Class A, discrete signal path</li><li>Current consumption: 60mA</li><li>Over Current Resettable Fused (prevents any module problem from affecting your rack)</li><li>ROHS - Lead Free </li></ul> LILPEQ-R Pinout <ul><li>Pin 1: Chassis Ground</li><li>Pin 2: Output A +</li><li>Pin 3: Output B + (mult from pin 2)</li><li>Pin 4: Output A -</li><li>Pin 5: Audio Ground</li><li>Pin 6: Output B- (mult from pin 4)</li><li>Pin 7: Input -</li><li>Pin 8: Input -</li><li>Pin 9: Input +</li><li>Pin 10: Input +</li><li>Pin 11: NC</li><li>Pin 12: +15 or 16VDC 60ma</li><li>Pin 13: Audio Ground</li><li>Pin 14: -15 or 16VDC 60ma</li><li>Pin 15: NC (+48VDC) </li></ul>Designed by Eisen Audio for Purple Audio.

Purple Audio LILPEQr 2 Band Program EQ
Two-band program EQ designed to work in standard "500" racks

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Purple Audio LILPEQr 2 Band Program EQ (Demo Deal)
Two-band program EQ designed to work in standard "500" racks

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The Purple Audio MC77 supercedes the MC76 re-engineered 1176 type FET Limiter. The MC77 recreates the audio circuitry of the revision E 1176, using modern components matched to the original. One significant component is the input attenuator. The input attenuator that was custom made for the original revisions A-F 1176 and for the Purple MC76 by Clarostat was discontinued in 2002. It was a J series T-pad attenuator with two 600Ω "build out" resistors to keep a constant 600Ω load on the source and primary of the input transformer. Clarostat changed carbon manufacturers and the new carbon manufacturer was unwilling or unable to make the part. Purple temporarily stopped making the MC76 to find a solution. We tried several three deck Clarostat 70 series pots in different configurations to achieve the same loading and to match the taper. We found a solution that matched the original; both the originals and replacement parts are drawn in the schematic that you can download below. At the same time, we looked at feedback gathered from the hundreds of satisfied MC76 users. Based on that feedback, we incorporated useful new features into the revised unit, which was designated the MC77. NEW features in the MC77: 
<UL>
<LI>True Bypass via sealed relay with front panel switch 
<LI>Improved stereo linking with front panel switch 
<LI>Sidechain insert loop or key input with front panel switch 
<LI>Buffered VU meter can monitor input or output level at +4dBu 
<LI>LED meter lights that don't burn out as incandescents do 
<LI>Heavy gauge black stainless steel enclosure 
<LI>115v/230v operation switchable from rear panel (serial# 600) </LI></UL>Features inherited from the MC76: 
<UL>
<LI>Discrete Transistor Audio Path Electronics 
<LI>Single Element Class A Output Amplifier 
<LI>Transformer Balanced XLR Inputs and Outputs 
<LI>Zener Shunt Regulated Audio Power Supply 
<LI>Compression Ratios - 4:1, 8:1, 12:1 and 20:1 
<LI>Fast Attack Time - 20 microseconds to 800 microseconds 
<LI>Release Time - 50 milliseconds to 1.1 second 
<LI>Gain of 45dB (full gain with no limiting) 
<LI>Ruggedized Design - PCB stiffener, chassis mount transformers 
<LI>Purple Anodized Aluminum Front Panel 
<LI>3 year warranty</LI></UL>

Purple Audio MC77
New model of the re-engineered 1176 FET limiter

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The Purple Audio Moiyn makes the Sweet Ten into a 8x2 mixer. With the Moiyn installed into slot 9 of the Sweet Ten, slots 1 through 8 become input modules to the Moiyn. Because of the Moiyn's differential voltage summing input amplifiers, any standard module can be used in slot 1 through 8 with minimal loading, and without unbalancing their outputs. This means that even while you use the Moiyn to sum the outputs of the modules in slots 1 through 8, you can still take the slot 1 through 8 output XLRs to your DAW or tape machine. Our custom hexifiliar output transformers provide two stereo transformer isolated outputs. One pair of outputs appears on the two output XLRs for slot 9. The Moiyn has internal jumpers to feed the second pair of outputs to slot 10. With the jumpers enabled, you can feed a Cans headphone amp in slot 10 automatically, without patching any cables in the back. Because of the Cans' bridging transformer inputs, the pair of input XLRs on slot 10 can also be used as a second set of stereo outputs (with the input of the Cans multed to that output). The input XLR for slot 9 serves as a stereo input to the Moiyn mix buss for cascading multiple mixers. As an example: take one Sweet Ten with a Moiyn to do your drum submix and cascade that into a second Sweet Ten with a Moiyn for your whole mix. That's a fully discrete 16 channel summing mixer in 6 RU, and you can pick almost any combination of 500 modules as the channel modules. The front panel of the Moiyn has two columns of eight illuminated push buttons, for left and right assign for each channel. Tricolor LEDs on either side of the slot 8 assigns show the mixbuss signal level. Below is a high quality 2-buss rotary master fader. The audio signal path of the Moiyn uses the same discrete opamps found in our other modules.

Purple Audio Moiyn
All-discrete 8 channel summing amp for use with the Purple Sweet 10 rack

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The Purple Audio Odd Equalizer is a modern update of the classic "swinging inputs" console EQ, with four
easy to use bands. Each band uses a high quality inductor and
carefully selected caps to give two switchable frequencies. The bands
are carefully shaped and spaced to be musical, even at full 12dB boost
or cut. The highest band can also be switched from bell to shelf, to
boost frequencies extending well beyond 20kHz.

There are illuminated pushbuttons for additional fixed low (red) and
high (yellow) cut filters. A relay true bypass (green) allows for
easy comparison with unprocessed source material.
With the low and high cut switched out, and all four bands set to 0,
the frequency response is +/- 0.25dB from 15Hz to 25kHz, and -3dB at
60kHz. Has the same input and output transformer as the Biz

With specialized input and output transformers, the Odd has plenty of
headroom, even at full boost. The entire circuit is discrete, with no
electrolytic capacitors in the signal path, and no servo amps. With
only two active stages, the current draw is low enough to work in any
rack, and leave plenty of juice for other modules.

Specifications:<UL>
<LI>High Frequecy Peak/Bell 12kHz/8kHz
<LI>High Mid Frequency 4Khz/1k8kHz
<LI>Low Mid Frequency 650Hz/300Hz
<LI>Low Frequency 150Hz/75Hz
<LI>Low Cut 50 Hz
<LI>High Cut 12kHz</UL>

Purple Audio Odd 4 Band Inductor Eq
500 Series four-band parametric EQ

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The Purple Audio Pants uses a unique dual-bobbin input transformer from Cinemag unlike any other. The smooth Gain control helps you dial in the sound you want. If the output level is too high, you can ride the level down with the separate Level control. Pressing the "High" switch changes the feedback network to provide an insane 78dB of clean gain, a great match for very low output mics. With different Gain, High mode switch, and Level settings the Pants can produce many different tones with the same amount of output level. The front panel DI goes through a FET buffer into the input transformer, adding an extra dimension to the sound of the preamp. The DI load switch gives you two options, making it even easier to get the best direct tone for your instrument. Two LEDs clearly indicate signal level for the gain and output stages at a glance, turning green to indicate signal present, yellow for 10dB below clipping, and red for clipping. For easy serviceability and tweaking, the Purple discrete opamps can be replaced with any standard discrete opamp or a DIP-8 IC. The Pants uses our custom output transformer which provides two isolated outputs (when supported by the chassis).
 
 Specifications:
<UL>
<LI>Maximum output level +33dBu
<LI>Frequency response 10hz – 60kHz +/- 1db
<LI>Transformer input:
<UL>
 <LI> Mic mode
 <UL>
 <LI>Maximum gain 72dB in normal mode
 <LI>Maximum gain 78dB in high mode
 <LI>Line mode
 <LI>Maximum gain 40dB in normal mode
 <LI>Maximum gain 42dB in high mode
 </UL>
</UL>
 <LI>Direct input:
 <UL>
 <LI>Mic mode
 <UL>
 <LI>Maximum gain 60dB in normal mode
 <LI>Maximum gain 64dB in high mode
 <LI>Line mode
 <LI>Maximum gain 25dB in normal mode
 <LI>Maximum gain 30dB in high mode
 </UL>
</UL>
</UL>

Purple Audio Pants - Differential Microphone Preamp
A four opamp, diferential mic preamp designed to work in standard "500" racks

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Many manufacturers, including past Purple Audio prototypes, use linear 
power supplies for their racks. Traditional wisdom holds that linear 
power supplies are ideal for audio and generate less noise and 
interference. In many cases, especially with poorly designed "off the 
shelf" switching power supplies, this is true. However, in the case of a
 10 slot series 500 rack, even a well designed linear power supply 
generates a substantial magnetic hum field and far too much heat to 
allow for internal mounting. This problem is caused in part by the wide 
variation of line voltage across the world. External power supplies are 
cumbersome and inconvenient and consideration still has to be taken as 
to their placement in relation to other equipment. With the advancement 
of switching power supplies it is now possible to have a switcher that 
does not compromise audio performance and delivers or exceeds all 
specified current needs. Purple Audio has spent years perfecting just 
such a power supply. They have comparatively tested all of theirs, and 
many of their competitors, modules at full bandwidth (10Hz - 500kHz) on 
lab quality over built bench supplies to make sure that the Sweet Ten is
 not compromising audio performance in any way. Simply put, your 500 
series modules will perform at their highest level in a Purple Sweet Ten rack. Audio performance improvements are considerable. 
 
Features 
<ul><li>10 Slot 500 Module Rack</li><li>Internal 150K switching supply</li><li>+/- 16VDC 1.5A</li><li>+48VDC 150ma</li><li>Second Balanced Output Utilizing Edge Connector 3 & 6</li><li>Second Balanced Input Utilizing Edge Connector 7 & 9</li><li>Front Handles</li><li>Locking Female XLR connectors</li><li>Ninth slot capable of accepting the Purple Audio Moiyn (8x2) Mixer Module (specs to come)</li><li>No PSU noise in adjacent slots</li><li>Rear Ground connector</li><li>Capable of putting out the 500 module current spec 1.3A from 90VAC to 240VAC 50/60hz</li><li>CE, ROHS, & WEEE Marked</li></ul>
The Sweet Ten top, side, and back panels are finished in trivalent 
yellow chromate cold rolled steel instead of painted steel for improved 
grounding and shielding. Purple Audio's ground plane motherboards 
provide additional grounding. Additionally, the rack motherboard has 
.1uf high frequency bypass capacitors at each slot to improve filtering,
 especially for modules with DC/DC converters. Functionally, the Sweet 
Ten offers 2 inputs and 2 outputs per slot. Many of the Purple modules 
already take advantage of second output and the Moiyn mixer module will 
use the second input to allow for stereo balanced source injection. 
Future uses of these connectors include fader loops on future modules as
 well as a few surprises!

Purple Audio Sweet 10 Rack Free when you buy any (8) NEW 500 Series Modules!
Holds ten 500 Series modules

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The Purple Audio TAV 10 Band Inductor EQ is a new take on the console graphic, with ten easy to use bands. Each band uses a high quality inductor and carefully selected caps to set the center frequency. At full boost and full cut the bands are narrow enough to still be useful individually, but at lower settings the bands widen out for more gentle shaping. Even at full boost and cut, the filters are shaped to be musical and useful.
 
 An illuminated push button for relay true bypass (green) allows for easy comparison with unprocessed source material. A Tricolor LED meters the signal. With the low and high cut switched out, and all four bands set to 0, the frequency response is +/- 0.25dB from 15Hz to 25kHz, and -3dB at 60kHz.
 
 With specialized input and output transformers, the TAV has plenty of headroom, even at full boost. The entire circuit is discrete, with no electrolytic capacitors in the signal path, and no servo amps. With only two active stages, the current draw is low enough to work in any rack, and leave plenty of juice for other modules. 
 
Features:
<ul>
<li>Each band boost or cut by 12dB
</li><li>Relay True Bypass
</li><li>Tricolor LED level meter
</li><li>Transformer balanced in and out
</li><li>Discrete signal path
</li><li>No electrolytic caps in signal path
</li><li>Current consumption: 60mA
</li><li>Over Current Resettable Fused (prevents any module problem from affecting your rack)
</li><li>ROHS - Lead Free 
</li></ul>
 For easy serviceability and tweaking, the Purple discrete opamps can be replaced with any standard discrete opamp or a DIP-8 IC.
 
Tav Pinout
<ul>
<li>Pin 1: Chassis Ground
</li><li>Pin 2: Output A +
</li><li>Pin 3: NC
</li><li>Pin 4: Output A -
</li><li>Pin 5: Audio Ground
</li><li>Pin 6: NC
</li><li>Pin 7: Input -
</li><li>Pin 8: Input -
</li><li>Pin 9: Input +
</li><li>Pin 10: Input +
</li><li>Pin 11: NC
</li><li>Pin 12: +15 or 16VDC 60ma
</li><li>Pin 13: Audio Ground
</li><li>Pin 14: -15 or 16VDC 60ma
</li><li>Pin 15: NC (+48VDC)

</li></ul>

Purple Audio TAV 10 Band Inductor EQ
10-band inductor-based graphic EQ for 500 Series frames

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