NEW: DIY kits and pcbs for the Kora 3T SE MC or MM are now available. Please email for details.

As the Kora 3T Special Edition phono stages are no longer in production I've uploaded a short history of its development, including full circuit diagrams for both MM SE and MC SE versions in the Philosophy section. New phono stage - a further development of the Kora 3T SE circuit - would be available soon as Analogue Alchemy product.

Note: The award-winning Kora 3T Limited Edition phono stage is still available on a special order in both MM and MC versions.

Services section is added.

Manuals section is added.

Library section is added.

Circuit Ideas section is added.

New A.N.T. Audio U04103-70 and U04103-70C Test Tapes contain four different sections on a single tape:

400Hz Dolby Level - 1min
10kHz (-12dB) - 1min
400Hz (-12dB) - 1min
3kHz (-12dB) - 2.5 min

Recorded full-track on C-10 Type II cassette with 70us EQ.

This tape is suitable for setting the PB level, azimuth, speed, checking W&F and 3 points frequency response. It is a cheaper alternative to separate alignment tapes with somewhat relaxed level precision. The cheaper "C" grade of this tape is suitable for the PB level, azimuth, speed and W&F checks only but not for the frequency response check as it is not guaranteed in that respect.

Article "Application of indirect negative feedback in FET voltage amplifiers." is added to the Philosophy section.