Philips 22 AH 280 specifications

General

Connections

Tech nical data

Special features

This preamplifier has a very robust and long-term stable design. Due to its fully enclosed potentiometers, it is almost completely noise-free even after 15 years of playing time when sound or volume controls are operated. Due to the completely closed design, the device 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 preamplifier 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, with the third being able to output the signal 10dB amplified. This can then also be used to control larger output stages.

Other devices from the series:

Here again an interior view of the device:

Good to see the fully encapsulated potentiometers.

here in a group among its peers: from top to bottom: Tuner 22ah180, Pre amp 22ah280,Tapedeck N5758, timer 22ah080, Amp 22ah380

and photographed again, as a highlight of a Philips Hifi magazine from 1980 at the price of a (then) mid-range car:

Model: 22 AH 280
Years of construction: 1980 - ?
type: preamp
remote control: no
power consumption: 28 Watt
dimensions: 482 x 75 x 360 mm (WxHxD)
weight: 6 kg
color: black
factory price approx.: 1.000 DM (about 500 €)

number of inputs: 7
- Phono 1
- Phono 2
- AUX
- Tuner
- Tape 1
- Tape 2
- Mic

Phono 1
Phono 2
AUX
Tuner
Tape 1
Tape 2
Mic

number of outputs: 5
- Tape 1 Rec
- Tape 2 Rec
- exit 1 'Switched'
- exit 2 'Unswitched'
- exit 3 '+10dB'

Tape 1 Rec
Tape 2 Rec
Output 1 'Switched'
exit 2 'Unswitched'
exit 3 '+10dB'

input (sensitivity / impedance / total harmonic distortion)
- Phono 1 and 2: 2 mV / 40 kOhm / 0,006%
- AUX, Tuner: 245 mV / 10 kOhm / 0,004%
- Tape1, 2: 219 mV / 15 kOhm s / 0,004%
- MIC: 1.7 mV / 47 K-ohms
output (level/impedance)
- Tape 1/2: kA
- output 1 and 2: 2-8 V / 10 kOhm
- exit 3: 2,8-12,5 V / 600 Ohm s
frequency response
- Phono 1 and 2: RIAA ±0.3 dB
- AUX, Tuner, Tape 1/2: 10-20.000 Hz, -2 dB
- MIC: 50-20.000 Hz, +0.5 dB / -3 dB
regulation
- Bass:
  - crossover frequency 250 Hz: ±10 dB (at 70 Hz)
  - acquisition rate of 500 Hz: ±10 dB (at 100 Hz)
- treble sound:
  - crossover frequency 2.5 kHz: ±9 dB (at 9 kHz)
  - crossover frequency 5 kHz: ±12 dB (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/line-straight: Yes
ripple voltage distance (short-circuited)
- 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

Phono 1 and 2: 2 mV / 40 kOhm / 0,006%
AUX, Tuner: 245 mV / 10 kOhm / 0,004%
Tape1, 2: 219 mV / 15 kOhm s / 0,004%
MIC: 1.7 mV / 47 K-ohms

Tape 1/2: kA
output 1 and 2: 2-8 V / 10 kOhm
exit 3: 2,8-12,5 V / 600 Ohm s

Phono 1 and 2: RIAA ±0.3 dB
AUX, Tuner, Tape 1/2: 10-20.000 Hz, -2 dB
MIC: 50-20.000 Hz, +0.5 dB / -3 dB

Bass:
- crossover frequency 250 Hz: ±10 dB (at 70 Hz)
- acquisition rate of 500 Hz: ±10 dB (at 100 Hz)
height:
- crossover frequency 2.5 kHz: ±9 dB (at 9 kHz)
- crossover frequency 5 kHz: ±12 dB (15 kHz)

crossover frequency 250 Hz: ±10 dB (at 70 Hz)
acquisition rate of 500 Hz: ±10 dB (at 100 Hz)