BeoCenter 3500

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Manufactured: 1972 - 1977
Designer: Jacob Jensen
Colours: Rosewood, Teak, White

A combination system with the quality and specifications of "separates"

Beocenter 3500 was built upon the Beomaster 3000 and combined a top quality FM tuner, an automatic record-player and a powerful stereo amplifier. The tuner had six pre-set stations for instant selection, plus a large manual tuning scale. There was an illuminated tuning indicator and a signal-strength meter to assist easy, accurate tuning. The powerful amplifier produced 2 x 40 watts RMS of high-fidelity output and was equipped with switchable filters.

There was a comprehensive range of connection facilities including sockets for two pairs of loudspeakers, headphones and a tape recorder with monitoring. The record-layer was fully automatic with one master-control for operating all functions. You only have to select the control position applicable to the size of the record, and touch a button. Beocenter 3500 was an ideal, simple way of enjoying high quality sound from records and radio. It was fitted with a robust hinged dust cover which protects records during play.

Features:

In the high-fidelity amplifier section, emphasis was placed on specifications, frequency correction and connection facilities. The LOUDNESS feature permitted switching between an objective or a subjective linear reproduction and the LOW and I-II filter controls gave a sharper regulation of frequencies in addition to the normal bass and treble controls. The LOW filter helped reduce rumble resulting from poor records. The EH filter reduced hiss. There were sockets and push buttons for two pairs of loudspeakers. The headphone socket was on the receiver's front. The tape connection facilitated AB monitoring. All input signals could be adjusted at the receiver's base to give equal sound intensity on all programme sources. The FM section had six pre-set FM station selectors.

A light indicator assisted accurate tuning and an illuminated meter registered the signal strength of a station. The FM section was extremely sensitive (better than 1.4 uV I.E.C.) and harmonic distortion was a mere 0.4%. Field effect transistors, ceramic filters and integrated circuits were used. The built-in record-player was perfectly matched to the rest of the unit, from a specification point of view. The fitted pickup cartridge, the SP 10A (later SP 12A) had a spherical naked diamond and a stylus pressure of 1.2 grams. Frequency range was 20 - 25000 Hz ± 3 dB and distortion was lower than 1%. Wow and flutter was less than 0.09% and rumble was better than 60 dB.

The record player section was easy to operate: you simply selected the size of the record you intend to play - 7", 10" or 12" - and press a button. The record-player automatically selected the correct speed - 33 or 45 rpm - and lowered the pick-up into the first groove. When the record ended, the pick-up arm returned to its resting place and the turntable switched off. The turntable and pick-up arm had a pendulum suspension which made the record-player section insensitive to vibrations. Deep furrows in the turntable made it easy to pick up records. A stroboscope and a spindle adaptor for centreless records was provided. Beocenter 3500 was fitted with a hinged dust lid which was easily removed by a sliding action.

Beocenter 3500 had an extra Phono input. This was a 'hang over' from the Beomasters of the time which allowed two Beograms to be connected to the music centre. However, Phono 2 needed an RIAA pre-amplifier as it required a line level input. This feature became 'Tape 2' in later models.

BeoCenter 3500 Product Specifications

Types:
2401 (1972 - March 1977)
US 2409 (1972 - May 1977)

Power output:
2 x 40 watts RMS
2 x 75 watts music power
Speaker impedance 4 ohms
Distortion Less than 0.6% at 1000 Hz and 40 watts of power output on both channels simultaneously
Intermodulation Less than 0.6% at rated output, measured at 250 and 8000 Hz at amplitude ratio of 4:1 (DIN 45.403/3)
Channel separation Better than 45 dB at 1000 Hz and better than 30 dB between 250 Hz and 10,000 Hz. DIN 45 500/6. 2. 4. 1
Input separation Better than 60 dB at 1000 Hz and better than 45 dB between 250 Hz and 10,000 Hz. DIN 45 500/6
Bass control range +/- 17 dB at 50 Hz
Treble control range +/- 14 dB at 10,000 Hz
Balance control range Min 60 dB
Tuning range 87.5 - 104 MHz
Phono:
Speeds 33 1/3 and 45 rpm
Rumble Better than 60 dB (DIN B)
Wow and flutter Better than +/- 0.15 % peak value (DIN), corresponding to +/- 0.06 % RMS Pickup: Pickup SP 10 A
Stylus pressure 1.2 g (pond)
Power supply:
2401: 220V
2409: 120V
Power consumption 20 - 200 Hz

Dimensions H x W x D: 14.5 x 58 x 35cm
Weight 18 kg

Connections: Headphone Jack, tape DIN, extra record player DIN

Related Products

Created: 2nd December 2006
Modified: 2nd February 2007

Author Notes:

My BeoWorld



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