500 Series Preamp

Harrison Audio D510r Chassis – Precision and Durability for High-End Audio BuildsThe Harrison Audio D510r Chassis is a robust and meticulously engineered enclosure designed to house and protect your high-performance audio components. Crafted for audiophiles and custom builders, this chassis offers exceptional build quality and optimal shielding, ensuring your audio system performs at its best with minimal interference.Key Features:Heavy-duty steel construction for enhanced durability and vibration resistancePrecision-cut panels for easy assembly and secure component mountingSuperior electromagnetic shielding to reduce noise and interferenceAmple internal space to accommodate a variety of audio hardware configurationsSleek, professional finish suitable for both professional studios and home setupsVentilation provisions to maintain optimal operating temperaturesCompatible with standard rack mounting systems for versatile installation optionsHarrison Audio D510mx Mixer Interface – Professional-Grade Control for Superior Audio MixingThe Harrison Audio D510mx Mixer Interface delivers precise, intuitive control and seamless integration for your mixing setup. Engineered for both studio professionals and live sound engineers, this interface combines high-quality audio processing with flexible connectivity, making it the perfect centerpiece for any audio environment.Key Features:High-fidelity audio processing for crystal-clear sound qualityIntuitive control layout designed for efficient workflow and quick adjustmentsMultiple input/output options for versatile connectivity with various audio gearRobust build quality to withstand demanding studio and live environmentsLow-latency performance for real-time monitoring and mixingExpandable design to integrate with additional Harrison and third-party equipmentCompatible with industry-standard protocols and software for maximum flexibilityLegendary Analog Preamp in Portable 500-Series FormatBring the classic warmth and clarity of Harrison's famed 32Classic console into your studio with the 32Cpre+ 500-Series Microphone Preamp. Designed with a premium Jensen JT-MB-CPCA transformer, this preamp delivers rich lows, open midrange, and silky highs—all in a compact module ideal for modern tracking and mixing setups. It also features Harrison’s signature tonal LP/HP filters and flexible input options for seamless, studio-grade signal control.Key Features:Authentic Harrison “32Classic” sound via Jensen JT-MB-CPCA transformer-coupled preampGenerous gain range: +20 dB to +70 dB, perfect for ribbon, dynamic, and condenser mics with ease of headroomLegendary high-pass (25 Hz–3.1 kHz) and low-pass (160 Hz–20 kHz) filters with a musical 12 dB/octave slope and resonant peak on the HPFFront-panel combo XLR / ¼″ jack for mic or Hi-Z instrument input, plus options like -20 dB pad, polarity reverse, +48 V phantom, and 180° phase switchInput clip/overload LED for accurate level monitoring at a glanceRugged and compact: 500-series module format for easy integration into lunchbox racks and studio environments

Legendary Analog Preamp in Portable 500-Series FormatBring the classic warmth and clarity of Harrison's famed 32Classic console into your studio with the 32Cpre+ 500-Series Microphone Preamp. Designed with a premium Jensen JT-MB-CPCA transformer, this preamp delivers rich lows, open midrange, and silky highs—all in a compact module ideal for modern tracking and mixing setups. It also features Harrison’s signature tonal LP/HP filters and flexible input options for seamless, studio-grade signal control.Key Features:Authentic Harrison “32Classic” sound via Jensen JT-MB-CPCA transformer-coupled preampGenerous gain range: +20 dB to +70 dB, perfect for ribbon, dynamic, and condenser mics with ease of headroomLegendary high-pass (25 Hz–3.1 kHz) and low-pass (160 Hz–20 kHz) filters with a musical 12 dB/octave slope and resonant peak on the HPFFront-panel combo XLR / ¼″ jack for mic or Hi-Z instrument input, plus options like -20 dB pad, polarity reverse, +48 V phantom, and 180° phase switchInput clip/overload LED for accurate level monitoring at a glanceRugged and compact: 500-series module format for easy integration into lunchbox racks and studio environments

Ultra-clean to heavy distortion...You decideThe VHD+ Pre Module for the popular 500 format modular rack platform makes the uniquely versatile VHD based preamp technology from Duality, SSL's industry leading large format studio console, available for studios of all sizes. The VHD+ Pre module is an immensely versatile recording and processing device. It can deliver ultra clean SSL SuperAnalogueTM grade recordings but also features a switchable VHD mode. SSL's patented Variable Harmonic Drive (VHD) system uses a 100% analogue signal path to generate rich harmonic distortion.Increase VHD input gain and the Variable Harmonic Drive process introduces either 2nd or 3rd harmonic distortion or a blend of the two to your source material. At lower gain settings it adds gentle valve-style warmth or a touch of transistor edge. As the gain is increased the more extreme the distortion becomes, until at high gain settings it delivers fierce trashy transistoresque grunge.The VHD+ Pre module gives the user ultimate versatility from a studio grade preamp. Whether it's ultra-clean traditional SSL, subtle warming or totally trashy transistor distortion, VHD will change your expectations of what a preamplifier should deliver.Key featuresSSL SuperAnalogueTM grade preamp2nd order harmonics (valve warmth to extreme distortion)3rd order harmonics (transistor edge to totally trashed)Absolute control via 2nd and 3rd order harmonic blendVariable Harmonic Drive (VHD) in/out switchSwitch-able LF Filter+48V phantom powerPhase invert switchPAD switchHi-Z switch

Deceptively simply, extremely effective SiX Channel Strip (SiX CH) is a single-width 500 Series channel strip using the SuperAnalogueTM channel processing features from SSL’s SiX console including the Mic-pre, low and high frequency EQ, as well as the single knob compressor.FeaturesSSL SuperAnalogueTM  mic pre+48V phantom powerPhase invert switch5 segment LED meter in dBuSwitched 12 dB/oct, 75 Hz High Pass Filter (HPF)Classic SSL HF and LF EQSwitch from shelf to bell curveSingle knob Channel Compressor with variable Threshold.Front Panel TRS Line Input with 1MΩ Hi-Z switch.SuperAnalogue Using the same technology as SiX and large-format SSL consoles, SiX CH features a SuperAnalogueTM mic pre, offering wide gain range and ultra-low noise. It’s clean, fast and punchy - the perfect preamplifier for any source material.SSL HF and LF EQSiX CH EQ is a classic SSL style gentle, broad stroke two-band design with high and low shelving filters at 3.5 kHz and 60 Hz, +/-15 dB gain range. Each band can be independently switched between shelving and bell curves. The bell curves change centre frequency to operate at 5 kHz and 200 Hz giving greater versatility from the two controls.Channel compressor A ‘one knob’ channel compressor with features that give powerful and versatile performance from its deceptively simple controls. Using the tried and tested SSL feed-forward circuit design, program-dependant attack time and automatic make-up gain to maintain signal level.TRS Line Input The front facing TRS line input offers a convenient way to add instruments on the fly or use SiX CH as a feature packed summing module. 10 kΩ nominal Line Input impedance can be changed to 1 MΩ via the Hi-Z switch. The 1MΩ impedance makes this input suitable for very high impedance sources such as passive guitar pickups without the need for an external DI box.

The 8173 module is a Heritage Audio´s new design, which has been engineered to fill input module slots in the restoration process of vintage 80 Series sound mixing consoles. It is also compatible with the Heritage Audio Frame 8 and Rack 2 powered enclosures. The 8173 could be easily described as a 1073 with the mid bands of a 1081. We´ve decided to keep the 1073 Baxandall shelving lo and hi eq bands as they sound amazing, but have implemented a choice of 3 hi shelving frequencies, a la 1084. Special care has been taken in sourcing the correct components that ensure performance will be as close to a 1070s unit as it is possible nowadays. Custom polystyrene and film tone capacitors have been developed to closely match the Siemens Styroflex and Mullard Mustard types of the late 60s and early 70s. Custom input transformers have also been co designed with Carnhill Transformers´ Oxford factory to our special requirements. The Heritage Audio 8173 is entirely handmade in our facilities in Spain, employing the same old-fashioned wiring and soldering techniques of the 70s. All its circuitry is held into five plug in cards. Specifications: Microphone input impedance: HI, 1200 Ohm minimum, LO, 300 Ohm minimum. Higher gain positions gradually have greater impedances, optimum for lo gain ribbon mics. Input is transformer balanced and floating. Line input impedance: 10KOhms bridging, transformer balanced and floating. Output impedance: Less than 75 Ohms, transformer balanced and floating, to drive a load of 600 Ohms. Maximum output: Greater than +26dBu into 600 Ohms, THD: Less than 0.025% at 1Khz, Less than 0.05% at 100Hz. Frequency response :20Hz (+0.3dB) to 20Khz (-0.2dB). Maximum Gain: Slightly greater than 80dB. Noise: Less than -100dBu. Power consumption: Less than 110 mA @24VDC.

The  6673 module is a Heritage Audio´s new design which has been engineered to fill input module slots in the restoration process of vintage 80 Series sound mixing consoles. It is also compatible with the Heritage Audio Frame 8 and Rack 2 powered enclosures. The 6673 is a 4 band equalizer in a 1073 sized module, combining the mid band of the vintage 1066 module and an expanded 1073 mid band. This fact allows a more complex equalizing whilst at the same time maintaining the same sonic qualities. Vintage connoisseurs already know how sweet the 1066 mid band sounds and how well it complements the 1073´s one. Additionally the 6673 features three frequency´s options for the high shelf, as opposed to the fixed ones on both the 1073 and 1066, covering both. Special care has been taken in sourcing the correct components that ensure performance will be as close to a 1070s unit as it is possible nowadays. Custom polystyrene and film tone capacitors have been developed to closely match the Siemens Styroflex and Mullard Mustard types of the late 60s and early 70s. Custom input transformers have also been co designed with Carnhill Transformers´ Oxford factory to our special requirements. The Heritage Audio 6673 is entirely handmade in our facilities in Spain, employing the same old-fashioned wiring and soldering techniques of the 70s. All its circuitry is held into five plug in cards. Specifications: Microphone input impedance: HI, 1200 Ohm minimum, LO, 300 Ohm minimum. Higher gain positions gradually have greater impedances, optimum for lo gain ribbon mics. Input is transformer balanced and floating. Line input impedance: 10KOhms bridging, transformer balanced and floating. Output impedance: Less than 75 Ohms, transformer balanced and floating, to drive a load of 600 Ohms. Maximum output: Greater than +26dBu into 600 Ohms, THD: Less than 0.025% at 1Khz, Less than 0.05% at 100Hz. Frequency response :20Hz (+0.3dB) to 20Khz (-0.2dB). Maximum Gain: Slightly greater than 80dB. Noise: Less than -100dBu. Power consumption: Less than 110 mA @24VDC.

The Heritage Audio 1073 has been engineered to fill input module slots in the restoration process of vintage 80 Series sound mixing consoles. In case outboard fitting is preferred, the HA1073 can be installed into the Heritage Audio Frame 8 and Rack 2 powered enclosures. Special care has been taken in sourcing the correct components that ensure performance will be as close to a 1070s unit as it is possible nowadays. Custom polystyrene and polypropylene film tone capacitors have been developed to closely match the Siemens Styroflex and Mullard Mustard types of the late 60s and early 70s. Custom input transformers have also been co designed with Carnhill Transformers´ Oxford factory to our special requirements, which ensure correct harmonic distortion content and saturation points. The Heritage Audio 1073 is entirely handmade in our facilities in Spain, employing the same old-fashioned wiring and soldering techniques of the 70s. Manufacturing a single module takes several days of one of our master builders. All its circuitry is held into four plug-in cards. Specifications: Microphone input impedance: HI, 1200 Ohm minimum, LO, 300 Ohm minimum. Higher gain positions gradually have greater impedances, optimum for low gain ribbon mics. Input is transformer balanced and floating. Line input impedance: 10KOhms bridging, transformer balanced and floating. Output impedance: Less than 75 Ohms, transformer balanced and floating, to drive a load of 600 Ohms. Maximum output: Greater than +26dBu into 600 Ohms, THD: Less than 0.025% at 1Khz, Less than 0.05% at 100Hz. Frequency response :20Hz (+0.3dB) to 20Khz (-0.2dB). Maximum Gain: Slightly greater than 80dB. Noise: Less than -100dBu. Power consumption: Less than 110 mA @24VDC.

The API 512v is a mic / line / instrument preamp, world famous for its ability to provide a low noise (-129 EIN) and unusually good sounding front end for all types of audio applications. Sonically, it delivers the instantly recognizable API sound at an affordable price, and in the scalable API 500 Series format. Offering an impressive 65 dB of gain, the 512v includes front panel Variable Output control, switchable 3:1 output transformer selection, phantom power, switchable polarity, -20 dB pad, and Mic or Instrument/Line selector. The front panel Combo-style XLR and 1/4 inch connector combined with rear panel mic access allows for additional flexibility when installed into an API lunchbox®, API's 10 position 500V vertical rack, or into an API console.The API 512v remains faithful to the circuit designs of API's founder Saul Walker. Artfully combining those circuits with API's proprietary transformers and the incomparable 2520 op-amp, the 512v is a highly musical and rich-sounding analog mic pre, equally at home in commercial recording spaces as it is in smaller home studios. Fully featured and still hand assembled, the 512v exhibits the reliability, long life, and uniformity which are characteristic of all API products. SpecificationsMic Preamp with 65 dB of gainVariable Output Level Control3:1 Output Transformer Tap SelectionFront and Back Panel Mic Input AccessLine/Instrument Preamp with 45 dB of gainFront Panel Combo-style XLR + 1/4 inch Line/Instrument InputLED VU meter for Gain Level indication20 dB pad switch, applies to mic/line/instrument48v Phantom switchable powerTraditional API fully discrete circuit design with 2520 Op AmpFeatures API's unique Five Year Warranty

The API 512C is a mic/line/instrument preamp designed to provide a low noise, unusually good sounding front end for all types of audio systems. Sonically, it is at the top of the "Mic Preamp List", regardless of price. Offering low noise (-129 EIN) and 65 dB of gain, the 512C includes phantom power, switchable polarity, -20 dB pad and Mic/Line or Instrument selector.  Front panel XLR and 1/4 inch connectors combined with rear panel mic access allows for additional flexibility when installed in an API LunchBox, Six Pack, 10 position vertical rack, a 2 position horizontal rack, or an API console. What makes the API 512C unique is its long evolution from the original 1967 era 512, the first modular mic pre, to the current full featured 512C, while preserving the original sound character that made it so much a part of the early days of recording. Offering high headroom and a wide variety of inputs and input access ponts, it is ideal for unusual and demanding applications.        FEATURESMic Preamp with 65 dB of gainFront and Back Panel Mic Input AccessLine/Instrument Preamp with 50 dB of gainFront and Back Panel Line/Instrument InputLED VU meter for monitoring output level20 dB pad switch, applies to mic/line/instrument48v Phantom switchable powerTraditional API fully discrete circuit designUses the famous API 2520 Op-Amp

The TG2-500 recreates the rare EMI TG12428 preamp from the EMI and Abbey Road recording and mastering consoles of the late ’60s and early ’70s, the sound heard on albums such as The Beatles’ “Abbey Road” and Pink Floyd’s “The Dark Side of the Moon”. For the first time, the legendary TG2 sound is available in 500 Series format.Chandler Limited took the mic preamp and line amplifier of the TG2 Pre Amp/DI, with the same discrete amplifiers and transformers of the TG series, and fitted them into a 500 Series module without changing the sound: creamy and smooth, with warmth, punch and a surprisingly open top end.

The Germ 500 MKII is Chandler Limited’s well-known Germanium preamp adapted for 500 Series racks. It uses classic germanium transistors in class A, transformer-balanced circuits, with the same transformers and amplifier blocks as the rack version, so the sound is the same: thick and creamy.The MKII updates the original Germ 500 with an improved faceplate layout and a new look. The power section was also upgraded, so the module starts up without issues in current lunchboxes and racks. Chandler has tested it in racks from API, BAE, A-Designs, Purple and Empirical Labs.

The Little Devil Pre Amp is a discrete, transformer-balanced 500 Series module that combines Wade Goeke’s designs with studio favourites of the past. Its class A gain stage sounds like no other Chandler Limited design: big, yet open and full of life.Almost every parameter of the sound can be changed, including the amplifier’s Feedback and Bias. Feedback increases harmonics dramatically across its range, and the way the circuit clips changes from soft class A to super-soft, tube-like behaviour. The sound ranges from heavily coloured and “overbiased” to gently coloured and in-your-face.