Ei tubes are made in the former Yugoslavia to the Philips license, using original Philips machinery, drawings and test procedures. Ei is one of today’s top quality manufacturers of audio tubes.

The Ei 12AT7 / ECC81 is one of the best tube in current production. The Ei tubes are great in your guitar and hi fi amps, as they produce a naturally sweet tone that most find very pleasing.

Substitute listing:
- Close or identical 12AT7, CV10662, CV455, CV8154, CV9859.
- Different rating or performance 12AT7WA, 12AT7WC, 6060, 6201, 6679, 7492, 7728, A2900, B152, B309, B739, CC81E, CK6201, CV4024, E2157, E81CC, ECC801, ECC801S, M8162, QA2406, QA2407, QS2406.
Warning: Substitutes are given as a guide only - please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application.

Information on tube matching