Other features built into the new amplifier include the company’s Power Guard Screen Grid Sensor technology that prevents early tube failure, and McIntosh’s Sentry Monitor technology that tracks the amp’s output current to ensure the amp operates within safe limits. The tubes and output transformer are protected by a 12-gauge stainless steel wire cage, and the MC3500 Mk II amp also provides a choice of balanced (XLR) and unbalanced (RCA) inputs to support its integration into stereo and home theater systems. The output section employs eight EL509S tubes, which the company says are similar to the 6LQ6 “sweep tubes” that were used in the original amp. This is where the legendary Unity Coupled Transformers are winded McIntosh winds nearly all their transformers in-house.

McIntosh points out the amp utilizes a fully balanced driver section that includes three 12AX7A and a single 12AT7 tubes. The output is 8 powerful EL509S, specially chosen because of the similarity to the original 6LQ6 that worked in the original MC3500. The MC3500 Mk II amp is rated to produce 350 watts of power through the use of modern internal parts and classic design elements such as McIntosh’s Unity Coupled Circuit output transformer, which was used in the original version of the amp. Like the original, the MC3500 Mk II uses a McIntosh Unity Coupled Circuit output transformer and a fully balanced driver section, with three 12AX7A and one 12AT7 vacuum tubes. According to the Binghamton, N.Y.-based manufacturer, the monoblock tube amp is compatible with a range of preamplifiers, turntables, CD players, media streaming devices and speakers to help integrators form complete audio systems.

Wound Output Transformers are part of McIntoshs patented Unity Coupled Circuit and. The Unity Coupled Circuit transformers have been adapted to produce 4 headphone impedance ranges of 32 100, 100 250, 250 600, and 600 1,000 Ohms at. McIntosh explains that its new MC3500 Mk II tube amplifier was developed by its engineering team to include modern features that highlight the company’s decades of musical history. McIntosh MC75 Monoblock Tube Amplifier And C22 Tube Preamplifier.

Mcintosh unity coupled transformer