Reference Marantz7 Circuit hifi tube preamplifier with 6Z4 or 6X4 ECC83 tubes

Technical parameters:

(1) Frequency response: 5hz-30khz (- 1dbu, no-load and 510 Ω load are the same). It can be seen from the test frequency and distortion that this circuit has strong load capacity. Note: the American ats-2 AP tester can only measure 30kHz, and the actual machine should exceed 50KHz

(2) Distortion: 0.009% (with 510 Ω load, 1kHz, output 1V)

(3) Magnification: 11.5x (with 510 Ω load test)

(4) Maximum output 20V (with 510 Ω load test)

(5) Signal to noise ratio: 91dbu

(6) Sensitivity: - 65dbu

(7) Input impedance 100K

tubes ：6Z4*1  ECC83*3   or  6X4 *1 ECC83*3

Size: 240 * 320 * 90mm

gross Weight  : 4.5kg