https://www.pendulumaudio.com/home daily 1.0 2025-06-26 https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1584915096342-R46FYYIEJ97WTKQ10KEJ/image-asset.jpeg Home - Need a Repair? Gear acting up? Contact your local pro-audio technician. https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1584914206526-6Q8EXXVZJBWXHHY38RMJ/IMG_3084+flip.jpeg Home - A Note From Our President At this time, Pendulum Audio has suspended the production of all units and equipment. After over thirty years of running the daily operations, I have made the difficult decision to look towards the next chapter of not only my life, but the life of Pendulum Audio. We are in active discussions with several companies interested in acquiring Pendulum. Over the next few months, we will update you on the progress of our negotiations. In the meantime, feel free to use the submission form below to contact us regarding our available stock. I would like to take a moment to extend my heartfelt gratitude to all our clients and customers over the years. Thank you for your patronage, kind words, and friendships. I will personally still be active in pro audio from the sidelines, and I hope to see you all at AES and NAMM in the coming years! Greg Gualtieri https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1584914552255-0E01OYS82R3307M7HQ54/rack.JPG Home - Looking for an Operating Manual? Missing a manual? You’re in luck! Find and download them all here. https://www.pendulumaudio.com/design-concept daily 0.75 2020-05-09 https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1583792089318-Q39V2F2R9YBFY3HCQ6M7/rack.jpg Design Concept - Our Design Concept The amazing proliferation of new vacuum tube-based audio products has, quite frankly, given many people the wrong impression about the way tubes can actually sound. While it's true that tubes possess a special 'character' that distinguishes them from their solid-state counterparts, many current designs have focused more on using tubes as an 'effect' - that is, to impart a strong coloration to the sound. This coloration is more a function of vintage circuit topologies and poorly regulated power supplies - artifacts of the circuit design - than any inherent limitation of the tube itself. Consequently, much of the clarity and detail that tubes are capable of delivering is often masked by poor high end response, a muddy low end and unacceptably large quantities of harmonic distortion. Tube coloration of this sort is not necessarily a bad thing, but those of us who use today's high resolution recording technologies frequently require a higher level of sonic accuracy. At Pendulum, our goal is to enhance the unique character of the way tubes sound and minimize the sonic artifacts. To this end, our line of vacuum tube signal processors represents the state of the art in modern tube design. These are class A, high headroom, short signal path, transformerless designs that provide superior audio performance and a level of clarity and intimacy that is difficult to describe, since most people have never heard a tube circuit without the sonic artifacts. In addition, all our products are hand-built to exacting standards, using the highest quality passive components and interconnects available. And we don't use a component just because a spec sheet says it's the best. We carefully listen to them and always let our ears be the judge. We encourage you to give our line of tube products a listen and let your ears be the judge. We think you'll change your opinion of how tubes really sound. — Greg Gualtieri President & Design Engineer https://www.pendulumaudio.com/greg-gualtieri daily 0.75 2020-06-15 https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1583791877168-HKUM5FGIGM7T8VIF7JYM/IMG_3084.JPG Greg Gualtieri - Greg Gualtieri Greg Gualtieri has been involved in music-related activities for more than 40 years, as a musician, recording engineer and record producer. His technical background includes studio equipment design and modification, recording engineering, guitar amp modification and repair, and sound reinforcement. His knowledge of audio electronics is largely self-taught, starting with the design and construction of vacuum tube mic preamps, tube compressors, power amplifiers and mixers in the mid-sixties. He holds a Bachelor of Science degree (BS) in Physics from Columbia University, and a Master of Science in Engineering degree (MSE) in Electronic Materials and Devices from Princeton University. During college, he worked at a number of recording studios in New York as a recording engineer and technical consultant. From 1978-1993, he was a Member of the Technical Staff in research at Bell Laboratories in Murray Hill, NJ, where he conducted fundamental studies of the physics of III-V semiconductors, including the growth and characterization of ultra-thin semiconductor superlattice structures using Molecular Beam Epitaxy (MBE). Much of the equipment used in those studies, including the MBE growth apparatus, was designed and built by him. He also worked with a team of Bell Labs scientists on the restoration of the Statue of Liberty. In 1988 he started his own company, Pendulum Audio, which specializes in the amplification of acoustic instruments and vacuum tube recording products. Pendulum Audio was the first company to market a rack-mounted acoustic instrument preamp, the HZ-10, back in 1988. He also continues to engineer and produce records, mostly solo or small ensemble projects involving acoustic stringed instruments. In 1995, he produced and engineered Kindred Spirits by Wayne Johnson (Polygram), a solo nylon-string jazz recording which reached the final nominating ballot for a Grammy award. https://www.pendulumaudio.com/sps-1 daily 0.75 2020-03-23 https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1584941632974-FDDHJTKZK6FW7U6MO1Y5/Modules.jpg SPS-1 Pickup/Pickup for Piezo/Magnetic and Piezo/Piezo combinations, Pickup/Mic for Piezo/Mini-mic and Magnetic/Mini-mic combinations, and Single Pickup for Piezo, Magnetic and active pickups https://www.pendulumaudio.com/mdp-1 daily 0.75 2020-03-23 https://www.pendulumaudio.com/ocl-2 daily 0.75 2020-05-09 https://www.pendulumaudio.com/6386-es-8 daily 0.75 2020-05-09 https://www.pendulumaudio.com/manuals daily 0.75 2020-05-27 https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1588997838763-28AJ5HSY57S1RB9GOU8V/PL-2FrontHIRes.jpg Manuals https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1588994330445-B4FNLCCIU0NJXC9JPPGQ/MDP-1HiRes.gif Manuals https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1588994486452-286J4OMNOKZ3UKRWER62/OCL-2HiRes.gif Manuals https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1588994278416-UX5TUB4FDGOXZ7B4ZI0A/SPS-1frontHiRes.jpg Manuals https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1588996689525-B8PGG1PSFNY2GM9WR9NT/6386HiRes.gif Manuals https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1588996728916-YUZ0QUBOPSP374QJA5ML/ES8HiRes.gif Manuals https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1588996866306-PN3HBMYVYYRH9XAW4M2M/QuartetHiRes.jpg Manuals https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1588999137092-UWWZ0QT2STPXYPC8FHLE/OCL500+border.jpg Manuals https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1588997812219-C1BU3C9S6JBD6V6CJLQ6/QuartetIIHiRes.jpg Manuals https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1589000778188-H5OE3CO2UYFUYVW5PLTD/HZ10SE+line+drawing.png Manuals https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1584941632974-FDDHJTKZK6FW7U6MO1Y5/Modules.jpg Manuals https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1588999390151-T0EUSSITSE3YTBT7LTYF/DS-500+border.jpg Manuals https://www.pendulumaudio.com/quartet daily 0.75 2020-05-09 https://www.pendulumaudio.com/quartet-ii daily 0.75 2020-05-09 https://www.pendulumaudio.com/pl-2 daily 0.75 2021-11-10 https://www.pendulumaudio.com/ocl-500 daily 0.75 2020-05-09 https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1589004862305-WOW4ROLZKF2K20LDHHZM/OCL500+border.jpg OCL-500 https://www.pendulumaudio.com/ds-500 daily 0.75 2020-05-09 https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1589005689200-UFZMVLOB0L8GZT6OOHRP/DS500+border.jpg DS-500 https://www.pendulumaudio.com/repairs daily 0.75 2025-06-26 https://images.squarespace-cdn.com/content/v1/5e66a4f104d86850e1f6ca3e/1590117872817-IITFQB0UMCKRLA3URQZY/image-asset.jpeg Repairs - Regarding Authorized Repairs We are no longer accepting any units for in-house repairs or servicing, and our authorized repair service provider has retired. For both domestic and international repairs, we recommend consulting with your local pro-audio technicians. https://www.pendulumaudio.com/privacy-policy daily 0.75 2022-08-17