Marantz PM-8 amplifier

Stereo Control Console

Features Preamplifier Section:

Transient Intermodulation Distortion (TIM) design and controll versatility. Like the SM-7 and SC-7, features design parts specifically created to combat transient intermodulation distortion.

Low Noise and Low Distortion phono Equalizer

The Input is a cascade defferential formed of low-nooise FET's, followed by a complete push-pull amp and Darlington-connected SEPP output. The entire phono equalizer circuit in PM-8 is DC for low distortion, low-TIM performance and better transient response.

Pre-preamp for MC cartridges, the built-in pre-amp is DC using low noise Fets at the input. S/N ratio is extremely good thanks to low-impedance negative feedback circuitry.

Features Power Section

Powerful low-TIM performance. Marantz use DC configurationthrought and improved every circuit part for combat Transient Intermodulation Distortion, TIM

Marantz use high speed power transistors created to our specifications and still more important, and improved open-loop response to enable us to use a lower amount of negative feedback thereby reducing the more ordinary forms of distortion.

Low Noise and High Output configuration. The input of the Pm-8 is formed of a differential Dual FET with matched thermal characteristics. Next is a duall FET differential  amp. An emitter/follower buffer and a 3 stage darlington-connected output, ending in a parallel push-pull circuit. This latter circuit is formed of an array of EBTs (Emitter - Ballast - Transistor) with superb performance characteristics, both in high power output and high speed switching.

Separate power Supplies, Left ann Right channels receive power from separate supplies. The predriver and power output sections each have their own transformer. To further assure a constant energy supply a quartet of massive 15,000 µF capacitors are used.

Specifications:

Power Output (rating per channel)

320 W at 4 Ω DIN

270 W at 4 Ω RMS

200 W at 8 Ω DIN

190 W at 8 Ω RMS

Total Harmonic Distortion (RMS, 8 Ω):  0,03%

Intermodulation Distortion:  0,03%

Dampingg Factor:  100

Main In Sensitivity/Impedance:  1,5 V/30  k Ω

Frequency Response:  DC 100 Hz-kHz

Signal-to-Noise Ratio Main In:  125 dB

MM Cartridge Input

Frequency Response (RIAA):  ±0,2 dB

Signal-to-Noise Ratio:  90 dB

Input Impedance:  1/100/27/47 k Ω

Input Capacity:  200 pf

Input Sensitivity:  2 mV

Equivalent Noise at Input:  0,24 µV

Dynamic Range:  125 dB

Moving Coil Cartridge Input

Input Sensitivity/Impedance:  200 µV/ 10/47/100/220 Ω

Aux. Input Sensitivity/Impedance:   150 mV/40 k Ω

Frequency Response:  5 Hz -100 kHz

Signal-to-Noise Ratio:  105 dB

Output Voltage:

Tape Out ;  415 mV

Preamp Out :  1,5 V

Output Impedance

Tape Out :  250 Ω

Preamp Output :  100 Ω

 dimensions (W x H x D):  416 x 146 x 437 mm

Weight:  26 kg

Finish : Walnut Cabinet

I like