The Apt/Holman Apticon
June 6–7, 2026 Sign up at https://www.apticon.org/
The inaugural event featuring the technology of Apt Corporation, Cambridge, MA 1977 – 1982.
This includes the Apt/Holman Preamplifier and the Apt 1 Power Amplifier.
Among those interested will be restoration technicians, analogue audio design engineers, and people involved in the history and development of analogue audio circuits. A certain amount of knowledge is pre-supposed like the fundamentals of transistor circuit design. (See 1 , 2 below)
Apt’s improvements will be covered in this seminar, such as techniques Apt used for lowering distortion, noise, and RFI susceptibility.
The most famous part of this design is the Holman Phono Preamp introduced first at Advent Corporation and improved upon in the Apt/Holman Preamp, that takes its name principally from the phono stage. Both the Apt preamp and power amp include many design features that were advanced for their time representing Tom’s experience with a wide range of products he’d owned, such that both the preamp and power amp were designed to overcome their limitations.
There will be talks on the preamp, power amp, and ancillary products, panels of technicians on restoring and even improving on the original design, sources for components, and a clinic for products brought to the seminar. While these segments are planned they are not guaranteed.
The venue is in Burbank, CA, center of the post-production world in film sound and with many audio companies, and a short distance within southern California for others. Burbank airport is close, and the host hotel is offering a discount.
Join us for this unique opportunity to discuss some of vintage audio’s most respected products with their principal designer. These insights into sound audio practice are alive and well 45 years after their introduction, and with some TLC the Apts can meet or surpass the original extensive specifications.
Attendees with receive urls for the talks, complete service manuals, etc., after the event.
Sign up soon as this event is expected to sell out.
1 https://www.electronics-tutorials.ws/amplifier/amp_2.html
2 https://www.electronics-tutorials.ws/amplifier/common-collector-amplifier.html
*There is also a link on the Steve Hoffman Audio forum regarding this event at https://forums.stevehoffman.tv/threads/apticon-featuring-abt-corporation-77-82-technology-summit.1244262/