PrimaLuna ProLogue Four silver

The Prologue 4 is a power amplifier using EL-34 output tubes with an output power of 2 x 35 W.

It is equipped with PrimaLuna’s exclusive Adaptive AutoBias circuit that continuously adjusts the bias of the output tubes, making tube matching unnecessary and extending their life while reducing distortion by up to 40%.

PrimaLuna’s exclusive low-loss, wide-bandwidth output transformers provide optimized phase characteristics.

The very low negative feedback (6 dB), low noise level, and very wide bandwidth allow optimal reproduction of micro-information.

Excellent impulse response and high output power allow the Prologue 4 to easily drive any type of speaker.

• Tubes
  • 2 x 12AX7
  • 2 x 12AU7
  • 4 x EL-34

Measurements

• Power: 35 W per channel
• Frequency response: 20 Hz – 85 kHz ± 0.2 dB at full power
• Distortion: 0.1% at 1W; max 2% at full power (resistive load)
• Signal-to-Noise Ratio: 89 dB (unweighted) ref. 1 W
• Input impedance: 100 kOhm
• Input sensitivity: 775 mV for rated power
• Max gain: 27 dB (22x)
• Output impedances: 4 and 8 Ω

Connectivity

• Inputs: stereo line

General

• Power consumption
  • Operating: 210W
  • Standby: 115W
• Weight
  • Net: 17 kg
  • Packaged: 19 kg
• Dimensions (D x W x H)
  • Product: 395 mm x 280 mm x 190 mm
  • Packaged: 465 mm x 380 mm x 305 mm