PRÉAMPLIFICATEUR HAUT DE GAMME APT HOLMAN MADE IN USA- RARE À MARSEILLE

Préamplificateur haut de gamme APT HOLMAN made in USA- RARE -BONNE ÉTAT. État : "Occasion" Service de livraison : Colissimo Recommandé préamplificateur haut de gamme APT HOLMAN. Apt Holman Preamplifier (1977-1983) Nombreuses entrées, double entrée vynile ajustables. Sortie external processor etc..la liste complète des caractéristiques techniques est en Anglais. bonne état de Fonctionnement Inputs Phono 2 Phono inputs. The first has selectable resistance and capacitance, while the second is fixed at 47kΩ and 50 pF. 100 mV maximum at 1 kHz, inverse RIAA, warp-proof. The right channel of each of the two phono inputs is internally adjustable ±2 dB for Line All line inputs are 50 kΩ in parallel with 330 pF. Unselected inputs are terminated with 2.2 kΩ. Maximum input level: 10 V RMS (+20 dBV or +22 dBm). 3 line-level inputs. 2 tape monitor loops. 1 external processor loop, for a total of six line-level and two phono inputs! Gain, Polarity and Volume Control 18 dB maximum gain from line inputs. Phono preamp gain: 36.5 dB at 1 kHz: 5 mV for 2 V output, 1.25 mV for 0.5 V output. All outputs are non-inverting. Volume control rated to track left-right to within 1 dB over the entire range. I'm impressed: this is a very important parameter, and this is the only preamp I've ever seen which bothers to specify it. The multiwiper 10 kΩ volume control has 32 clicks, or 31 intervals, at 10o per click, or room for 36 clicks in 360.o The volume control uses individually trimmed thick-film resistors to ensure precise channel-to-channel tracking. Outputs Two MAIN outputs, fed in parallel. Provisions on the circuit board to allow your technician to insert a fixed resistive pad in the path of the MAIN 2 output if this optimizes the gain structure for your power amplifier. 330 Ω source impedance, 5 kΩ/3,000 pF maximum load. Two tape outputs: 100 Ω source impedance, 10 kΩ/1,000 pF maximum load. One external processor output. One 1⁄4" headphone output from a separate amplifier. Frequency Response 20 - 20,000 Hz ±0.5 dB, with ultrasonic and ultrasonic filters active. RIAA EQ ±0.5 dB 30 - 15,000 Hz. Selectable 15 Hz Infrasonic filter (rear panel switch) Within 0.5 dB at 20 Hz, -3 dB at 15 Hz and > -30 dB at 5 Hz. Group delay 4 mS at 50 Hz. If the filter isn't selected, the -3 dB point is 8 Hz. Ultrasonic Filter (automatically engaged when Tone Controls active) Within 0.5 dB at 20 kHz, -3 dB at 40 kHz, and -18 dB at 100 kHz. Group delay 7 μS. Interchannel delay: < 0.5 μS. (the limit of audibility is 10 μS.) When the tone controls are defeated, the -3 dB point is 150 kHz. High Filter (only active with Tone Controls selected) -3 dB at 8 kHz. Distortion Less than 0.01% THD at rated output (2V) and lower. Less than 0.01 % SMPTE intermodulation distortion (60/7k Hz 4s1) at rated output (2V) and lower.