• Country
• Belgium

• Manufacturer / Brand
• Frank; Bruxelles - voir aussi Radio-Union

• Year
• 1961 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 330229

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 10

• Valves / Tubes
• ECC83 ECC82 ECC83 EL84 EL84

• Number of Transistors

• Semiconductors
• SR125Y80 SR250B150

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 110; 130; 145; 220; 245 Volt

• Loudspeaker
• - This model requires external speaker(s).

• Power out
• 30 W (unknown quality)

• Material
• Metal case

• from Radiomuseum.org
• Model: Hi-Fi Stereo Amplifier PRAM 30 - Frank; Bruxelles - voir aussi

• Shape
• Tablemodel, low profile (big size).

• Dimensions (WHD)
• 400 x 150 x 250 mm / 15.7 x 5.9 x 9.8 inch

• Notes

• Frank Pram 30 watts Ultra-linear Stereo tube amplifier.

  Output power: 15 W per channel
  Damping factor: 14, per channel
  Transformers: ultra-linear type
  Symmetrical push-pull output stages, in Class AB
  Negative feedback: global on each amplifier (20 dB), plus 6 dB additional
  Frequency response: 8 Hz to 80 kHz
  Harmonic distortion: 0.1% at 10 watts
  Intermodulation distortion: 0.4% at 10 watt
  Tone control ranges: bass +15 to -15 dB at 50 Hz, treble +13 to -16 dB at 10 kHz
  Cut-off filters: rumble -12 dB at 30 Hz, scratch -25 dB at 8 kHz
  Loudness: according to Fletcher-Munson curves, 15 dB at 40 Hz

  Inputs:

  • magnetic pick-up: sensitivity 3 mV, impedance 40 kΩ
  • tuner, tape, TV, aux: sensitivity 100 mV, impedance 500 kΩ

  Output in 4 modes: Channel A, Channel B, Stereo, Reverse Stereo
  Balance control.
  Mono-Stereo switch.

  Tubes are listed for one channel.

• Net weight (2.2 lb = 1 kg)
• 10.7 kg / 23 lb 9.1 oz (23.568 lb)

• Price in first year of sale
• 10,500.00 BFR

• Mentioned in
• -- Original prospect or advert

• Literature/Schematics (1)
• -- Schematic

• Author
• Model page created by Chris Walter. See "Data change" for further contributors.

• Other Models

• Here you find 6 models, 5 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Frank; Bruxelles - voir aussi Radio-Union