Amplification / Power Amplifiers

DESCRIPTION

Tubed stereo amplifier. The input and driver circuits are long-tail–pair differential stages, direct-coupled from the input to their output. While pairs of ECC83 triodes, strapped to improve their power bandwidth, are used for the driver stage, in practice the signal passes through only three tubes before arriving at the output transformer windings. This is a beneficially short signal path. An ECC82 double triode is present at the input, one tube per channel. The output stage operates in class-A/B "ultralinear" mode using General Electric 6550 beam tetrodes, three pairs operated in parallel to generate the necessary output. The "Ultralinear" mode is a selected transition point between pentode and triode operation for this class of output tube. The massive strengths of the Defy-7 are its natural, transparent, unfailingly musical sound coupled with an astonishing ability to play loud even into such difficult loads. Specifications: Rated output power: 100Wpc into 8 ohms or 4 ohms at 1kHz for 0.6% THD+noise. Bandwidth at 30 watts at 0 dB: 20KHz to 35KHz; Bandwidth at 30 watts at -3 dB: 15KHz to 100KHz. Output impedance at 1kHz: 0.4 ohms. Input impedance: > 100k ohms. Input sensitivity for rated output: 775mV. Load impedance: 1 to 16 Ohms. 1 x single-ended input (RCA). Two pairs of binding posts per channel. Remarks. a) No original packaging; b) After emails exchanged with Jadis Electronics, we have been told that there were two versions of DA-7 only. "The last one with 3 transformers boxes and the first with the 3 transformers in one box. The first didn’t last too long…".

SITE: https://www.jadis-electronics.com/

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