M2 Circuits services analog audio gear from tape decks to receivers. Owner Maurizio has been mentored by former Studer/Revox, TEAC/Tascam, and Marantz tech Tom McCartney and has had experience with many other brands of audio equipment.
Things we service include reel to reel tape decks (full repair, head relapping, calibration using MRL calibration tapes), cassette decks/recorders, receivers, power-amps, preamps, tube gear, guitar amplifiers, and even vintage test equipment from Fluke to Heathkit.
We use top quality parts and will never hesitate to let you know when something is ‘audio-foolery.’ We source components from reputable suppliers like Digikey, Mouser, and Farnell/Newark. Brands used include Nichicon, Panasonic, Rubycon, Vishay-Dale, Yaego, Stackpole, Pomona, and more.
Test equipment is well maintained and aligned, and of well known and trusted brands like Fluke, HP/Agilent/Keysight, Tektronix, Hickok, Heath, and BK Precision. Some test equipment has been custom designed and built by Maurizio himself for the sole purpose of testing audio equipment.
If you have gear that you’d like to have looked at, feel free to email us at firstname.lastname@example.org or submit a repair inquiry through our contact page.
Here is a list of some brands we service and repair:
Teac, Tascam, Studer, Revox, Akai, Nakamichi, Otari, Technics, Marantz, McIntonsh, Hitachi, Pioneer, Yamaha, B&O, Fluke, Heathkit, Hewlett Packard (HP), Conar, EICO, Keithley, Fender, Marshall, Bugera, ENGL, and more.
We do not work on any Sony tape products.
What is head lapping?
As heads wear, a flat spot in the center of the heads forms, causing the tape to not make contact with the apex of the head. This causes a reduction in high frequency response. Relapping is the process of removing material from the tape head until the original shape is achieved. This can only be done with permalloy or cobalt heads, and not with glass/ferrite or cassette deck heads.
Maurizio was trained by a Studer technician in head lapping, and has successfully lapped many heads from all kinds of tape decks. The process is done by hand, and very carefully to ensure the correct shape of the head is achieved.
Here are two Studer B67 heads, before and after being relapped.
Photos from past repairs: