Philips 22 AH 280

Data

General

• Manufacturer: Philips
• Model: 22 AH 280
• Years of manufacture: 1980 - ?
• Type: Preamplifier
• Remote control: no
• Power consumption: 28 watts
• Dimensions: 482 x 75 x 360 mm (WxHxD)
• Weight: 6 kg
• Color: black
• Original price approx.: 1.000 DM (approx. 500 €)

Connections

• Number of inputs: 7
  • Phono 1
  • Phono 2
  • AUX
  • Tuner
  • Tape 1
  • Tape 2
  • Mic

• Number of outputs: 5
  • Tape 1 Rec
  • Tape 2 Rec
  • Output 1 'Switched
  • Output 2 'Unswitched
  • Output 3 '+10dB

Technical Data

• Input (Sensitivity / Impedance / Distortion)
  • Phono 1 and 2: 2 mV / 40 kOhm / 0,006%
  • AUX, Tuner: 245 mV / 10 kOhm / 0,004%
  • Tape 1 and 2: 219 mV / 15 kOhm / 0.004%
  • MIC: 1.7 mV / 47 kOhm
• Output (level/impedance)
  • Tape 1/2: kA
  • Output 1 and 2: 2-8 V / 10 kOhm
  • Output 3: 2.8-12.5 V / 600 Ohm
• Frequency response
  • Phono 1 and 2: RIAA ±0.3 dB
  • AUX, Tuner, Tape 1/2: 10-20,000 Hz, -2 dB
  • MIC: 50-20,000Hz, +0.5 dB / -3 dB
• Tone control
  • Bass:
    • Crossover frequency 250 Hz: ±10 dB (at 70 Hz)
    • Crossover frequency 500 Hz: ±10 dB (at 100 Hz)

Treble:

• • • Crossover frequency 2.5 kHz: ±9 dB (at 9 kHz)
    • Crossover frequency 5 kHz: ±12 dB (at 15 kHz)

Loudness: yes, at -31 dB (+10 dB at 100Hz / +4 dB at 10 kHz)

• Subsonic: yes, -9 dB at 10 Hz
• Mute: yes, -20 dB
• Direct/LineStraight: yes
• Ripple spacing (shorted).
  • Phono 1/2: (IEC A) 85 dB, linear 75 dB
  • AUX, Tuner, Tape 1/2: (IEC A) 104 dB / linear 92 dB

MIC: (IEC A) 78 dB / linear 74 dB

• Stereo channel separation

Phono 1/2: 60 dB/1 kHz

• • AUX, Tuner, Tape 1/2: 80 dB at 1 kHz

Special Features

• selectable crossover frequency of bass and treble controls
• noise filter with -3 dB at 8 kHz (12 dB/octave)
• fully encapsulated potentiometers
• screwable into hifi racks
• three power amplifiers controllable, one output +10 dB

Remarks

This preamplifier is built very robust and long term stable. Due to its fully encapsulated potentiometers it is almost completely noise-free when operating tone or volume controls, even after 15 years of playing. Due to the completely enclosed construction, the unit is completely immune to dust attacks.

In its appearance it impresses with a solid metal front (certainly 5-6mm thick), with which it can be screwed into a hi-fi rack.

The three outputs of the preamp offer a really flexible use of the device. One output is switched off ('switched') by the headphone output, the second and third remain permanently active, the third being capable of outputting the signal amplified by 10dB. This makes it possible to drive even larger power amplifiers.

Other devices from the series:

• Timer 22 AH 080
• Tuner 22 AH 180
• Preamplifier 22 AH 280
• Integrated amplifier 22 AH 380
• Cassette deck N5758

Pictures

Here again an interior view of the device:

Good to see the fully enclosed pots.

here in a group of his peers: from top to bottom: Tuner 22ah180, Pre amp 22ah280,Tape deck N5758, Timer 22ah080, Amp 22ah380

and again photographed, as highlight of a Philips Hifi magazine Anno 1980 for the price of a (at that time) middle class car: