Heritage Audio HA-73EQ JR The Heritage Audio HA-73EQ JR is a high-end 500-series equalizer module that recreates the legendary sound of classic 1073 EQ circuits in a compact format. Designed for professional recording, mixing, and hybrid studio workflows, it delivers classic analog tone shaping with modern flexibility. It combines a discrete Class-A signal path with Carnhill transformers and a transformer-coupled line preamp, resulting in authentic British console tone with harmonic richness, depth, and musical precision—without requiring an external preamp. Sound Character The HA-73EQ JR delivers the classic “1073 EQ sound”—warm, smooth, and musical. Its Baxandall shelving filters provide natural high-frequency clarity and powerful low-end shaping, while the inductor-based mid band adds density and presence without harshness. Even with strong EQ boosts, the sound remains stable and musical. The Class-A output stage adds subtle saturation, enhancing depth and cohesion. Highlights ✔ 3-band EQ in classic 1073 style (500-series module) ✔ discrete Class-A signal path with transformer coupling ✔ Carnhill transformers for authentic vintage tone ✔ integrated Class-A line preamp (+6 to -20 dB) ✔ high shelf: ±16 dB at 10 / 12 / 16 / 20 kHz ✔ low shelf: ±16 dB at 35 / 60 / 110 / 220 Hz ✔ mid band: ±18 dB with 6 selectable frequencies ✔ Baxandall EQ design for musical shaping ✔ EQ bypass (EQL switch) ✔ high-headroom Class-A output stage ✔ compatible with all 500-series racks Typical Applications ✔ analog EQ during mixing ✔ vocal and instrument tone shaping ✔ drum and bass processing ✔ pairing with 500-series preamps and compressors ✔ building modular analog channel strips Technical Specifications ✔ type: 500-series 3-band EQ with line preamp ✔ circuit: discrete Class A ✔ gain: +6 to -20 dB (line) ✔ EQ: 3-band inductor-based (vintage style) ✔ high shelf: 10 / 12 / 16 / 20 kHz ✔ mid band: 0.36 / 0.7 / 1.6 / 3.2 / 4.8 / 7.2 kHz ✔ low shelf: 35 / 60 / 110 / 220 Hz ✔ max output: > +26 dBu ✔ THD: < 0.025% @ 1 kHz ✔ impedance: 10 kΩ in / <75 Ω out ✔ format: 500-series module

Heritage Audio HABPNL The Heritage Audio HABPNL is a high-quality 500-series blank panel designed for professional rack and modular systems. As an essential accessory for 500-series enclosures, it provides a clean front panel appearance while protecting internal components from dust, debris, and accidental contact. Constructed from durable metal and finished in Heritage Audio’s signature color, the panel integrates seamlessly into existing systems and maintains a consistent, professional studio aesthetic. Function / Design The HABPNL is used to cover unused slots in 500-series rack systems. In addition to improving the visual appearance, it enhances operational safety by protecting sensitive internal electronics from dust and external interference while preventing unwanted access. Pre-drilled mounting holes allow quick and easy installation or removal. Highlights ✔ blank panel for one 500-series slot ✔ protects internal rack components from dust and contact ✔ ensures a clean and professional rack appearance ✔ durable metal construction ✔ compatible with all 500-series racks ✔ pre-drilled mounting holes for easy installation ✔ Heritage Audio signature RAF blue-grey finish Typical Applications ✔ covering unused slots in 500-series racks ✔ protecting sensitive studio equipment ✔ improving rack aesthetics ✔ mobile recording and touring rigs ✔ professional studio installations Technical Specifications ✔ type: 500-series blank panel (single slot) ✔ material: metal ✔ color: RAF blue-grey ✔ dimensions: approx. 3.81 × 13.5 cm ✔ compatibility: all 500-series racks ✔ weight: approx. 45 g

Heritage Audio OST-6 V2.0 The Heritage Audio OST-6 V2.0 is a high-end 6-slot 500-series rack chassis designed to deliver maximum performance, stability, and compatibility for modular studio setups. Built for professional recording, mixing, and mastering environments, it provides a reliable platform for even the most demanding 500-series modules. At its core is Heritage Audio’s proprietary On Slot Technology (OST), where each slot features its own individually regulated and isolated power supply. Unlike conventional 500-series racks, this design minimizes interference and ensures optimal performance for every module—especially power-hungry Class-A and tube designs. Design Concept The OST-6 V2.0 is engineered to bring out the full sonic potential of 500-series modules. By isolating the power supply of each slot, it prevents modules from affecting each other’s performance, resulting in lower noise, improved stability, and better overall audio quality—particularly for microphone preamps and dynamic processors. The integrated Link function allows adjacent channels to be connected instantly via rear-panel switches—no patch cables required. Highlights ✔ 6-slot rack chassis for 500-series modules ✔ On Slot Technology (independent power per slot) ✔ reduced noise and improved module performance ✔ link function for channel pairing without patch cables ✔ compatible with all 500-series modules (including Class-A and tube) ✔ supports double-wide modules ✔ up to 400 mA per slot / 1.8 A total ✔ phantom power up to 140 mA total ✔ XLR connections per slot ✔ rugged steel chassis with aluminum front panel ✔ portable design with handle and removable rack ears Typical Applications ✔ building modular 500-series systems ✔ hosting preamps, EQs, and compressors ✔ mobile recording and live rigs ✔ high-end hybrid studios ✔ expanding outboard setups Technical Specifications ✔ type: 500-series rack chassis (6 slots) ✔ slots: 6 × 500-series (double-wide supported) ✔ power supply: individually regulated per slot (OST) ✔ current: up to 400 mA per slot / 1.8 A total ✔ phantom power: up to 140 mA total ✔ connections: XLR in/out per slot ✔ voltage: 100–240 V AC (universal) ✔ format: 19" rack / 3U + desktop ✔ dimensions: approx. 245 × 134 × 185 mm ✔ weight: approx. 2.37 kg

Heritage Audio 73JR II The Heritage Audio 73JR II is a high-end 500-series microphone preamp that faithfully recreates the legendary sound of classic 1073 console designs in a compact modular format. Designed for professional recording, mixing, and hybrid studio environments, it delivers authentic vintage tone with modern flexibility. Unlike many 500-series implementations, the 73JR II remains true to the original design by featuring a fully discrete three-stage Class-A circuit and an internal 24V power supply—ensuring identical headroom, performance, and saturation behavior to classic console modules. Sound Character The 73JR II delivers the classic “1073 sound”—warm, punchy, and musical. Its three-stage gain architecture provides up to 80 dB of gain, making it suitable for all microphone types, including low-output ribbon microphones. The combination of Class-A circuitry and Carnhill transformers produces rich harmonics, focused mids, and a solid low-end foundation. The result is a bold analog tone that ranges from clean and detailed to richly colored vintage character. Highlights ✔ 500-series microphone preamp in classic 1073 style ✔ fully discrete three-stage Class-A design ✔ true internal 24V power supply for authentic performance ✔ up to 80 dB gain for all microphone types ✔ custom Carnhill input and output transformers ✔ Class-A JFET DI input ✔ 50 dB Class-A line preamp ✔ switchable input impedance (LO-Z) ✔ variable high-pass filter (approx. 20–220 Hz) ✔ pad, phase reverse, and 48 V phantom power ✔ output trim for saturation control ✔ compatible with all 500-series racks Typical Applications ✔ vocal recording with classic console tone ✔ guitar, bass, and DI tracking ✔ drum and instrument recording ✔ reamping and analog coloration ✔ modular 500-series recording setups Technical Specifications ✔ type: single-channel mic/line/DI preamp (500-series) ✔ circuit: discrete Class A (three-stage) ✔ gain: up to >80 dB (mic) ✔ line gain: approx. 50 dB ✔ frequency response: approx. 20 Hz – 20 kHz ✔ THD: < 0.025% @ 1 kHz ✔ noise: approx. -125 dBu EIN ✔ max output: > +26 dBu ✔ input impedance: 1200 / 300 Ω switchable ✔ DI input: > 2 MΩ ✔ I/O: mic/line (XLR), DI (jack) ✔ format: 500-series module

Heritage Audio OST-10 V2.0 The Heritage Audio OST-10 V2.0 is a high-performance 10-slot 500-series rack chassis designed for professional studio and hybrid setups requiring maximum stability, power delivery, and sonic performance. As the largest unit in the OST lineup, it provides maximum capacity for complex modular signal chains. At its core is Heritage Audio’s proprietary On Slot Technology (OST), where each slot features its own individually regulated and isolated power supply. This ensures that even power-hungry Class-A or tube modules operate at peak performance without affecting other modules or introducing noise. Design Concept The OST-10 V2.0 is engineered to deliver the highest possible audio quality in modular 500-series systems. Unlike traditional racks with shared power supplies, each slot operates independently, reducing interference and improving overall system stability. This results in lower noise and better performance—especially for microphone preamps and dynamics processors. The integrated link function allows adjacent channels to be connected instantly via rear-panel switches—no patch cables required. Its large capacity makes it ideal for extensive studio setups and advanced outboard configurations. Highlights ✔ 10-slot chassis for 500-series modules ✔ On Slot Technology (independent power per slot) ✔ reduced noise and optimized module performance ✔ link function for channel pairing without patch cables ✔ compatible with all 500-series modules (including Class-A and tube) ✔ supports double-wide modules ✔ up to 400 mA per slot / 1.8 A total ✔ phantom power up to 140 mA total ✔ status LEDs per slot for voltage monitoring ✔ XLR connections per channel ✔ rugged steel chassis with aluminum front panel ✔ handcrafted in Spain Typical Applications ✔ large-scale 500-series rack systems ✔ complex signal chains (preamp + EQ + compressor) ✔ hybrid mixing and recording setups ✔ mastering and high-end tracking environments ✔ central outboard hub for professional studios Technical Specifications ✔ type: 500-series rack chassis (10 slots) ✔ slots: 10 × 500-series (double-wide supported) ✔ power supply: individually regulated per slot (OST) ✔ current: up to 400 mA per slot / 1.8 A total ✔ phantom power: up to 140 mA total ✔ connections: XLR in/out (DB25 optional depending on version) ✔ voltage: 100–240 V AC ✔ format: 19" rack, 3U ✔ weight: approx. 2.5 kg