Operating mode — single end, class A Output level (1 V RMS at the input), V — 4 Input level for all inputs (RMS), V — 1 THD (600 Ohm, 4 V), % — 0.1 Output impedance (at all inputs), Ohm — no more than 15 Signal-to-noise ratio (unweighted), dB — no worse than 100 Lamps — 2 x 6J43P-DRU Dimensions of preamplifier/transformer (H x W x D), mm — 175 х 480 х 390/80 х 125 х 300 Weight of preamplifier/transformer (without packaging), kg — 20/4
Thunderbird Preamplifier is based on a single end class A circuit. Dual mono power supply provides separate current stabilization in amplifying stages. The loudness set by a volume control using S.A.Lab produced and meticulously selected high-precision tantalum resistors in 2 dB increments. In the standard version, Thunderbird Preamplifier uses two 6Ж43П-ДРУ tubes with cryogenic treatment. Installation of other tubes is possible by request.