Kücke KS E-42 specifications

General

Connections

Tech nical data

Special equipment

Stereo power amplifier in service-friendly modular design. Classic push-pull output stage with bipolar power transistors in AA-B circuit can be bridged to mono. Due to the weak power supply, an increase in power to 280W is to be expected in a bridge circuit only with a speaker impedance of 8 ohms.

Other models of the same series:

Error symptoms of the aging electronics

--> Replace suspicious electrolytic capacitors with low-ESR types, e.g. Panasonic , at best check all the respective power amplifier module boards

--> Check the soldering points of the board and re-solder suspicious ones. Due to the screwed-on heat sink on the bridge rectifier, cold solder joints are often formed here as a result of the action of force. This is evident when the heat sink tends to one direction when the screw connection is tightened.

--> Parameter drift from a transistor in the discrete differential input stage (Important to use paired replacement transistors (current amplification factor Ic_beta + Ube) from well-known manufacturers). Pairing is no longer rocket science with the universal component testers available today!!

--> Cleaning oxidized contacts of output relays with emery cloth or replacing relays with new compatible type

--> Oxidized chinch sockets (main cause) or cold solder joint caused by mechanical force on these

--> Oxidized contacts of input relays (attention: type is not pin-compatible with DIL relays). Clean contacts or replace relay contacts with wire jumpers.

--> Loss of capacitance of the only coupling capacitor on one of the power amplifier boards

Only the experienced electronics technician should dare to repair his valuable Kücke electronics. 7a9842020bf91cb2958977171e7c2b24ENTION: There are voltages inside the power amplifier that exceed 42V, the VDE guidelines must be observed. Often, more breakage is repaired than repaired as a result of the intervention (repair attempt) and then ends up in the online auction house in the worst case. Burned-out traces, misaligned trimmers (you should know what you are doing if you turn around on trimmers for no reason without knowing their function), etc. are the result.

If in doubt, contact the competent repair service of Kücke see the link on the company profile!

Manufacturer: Kücke
Model: KS E42
Years of construction: 80s
Manufactured in: West Germany
Color:
- Front: Champage (brown button); Gold, chrome, Black (black button)
- Case: Brown at front: chanpage; Black at front: gold, chrome, black
Type: (Mono/Stereo) (Analog)
Remote control: yes via KS V32 + System control cable: BOX1, BOX2, On/Off
Power consumption: 15 W/400 W (no load/full power)
Dimensions: 445 x 60 x 365 mm (WxHxD)
Weight: 10.5 kg
Factory price approx. :

Front: Champage (brown button); Gold, chrome, Black (black button)
Housing: Brown at front: chanpage; Black at front: gold, chrome, black

Number of inputs:
- 2x Stereo: 2000 mV, 97 kOhm

2 x pairs of speakers

2x Stereo: 2000 mV, 97 kOhm

2 x pairs of speakers

Continuous sine power (with total harmonic distortion)
- 8 Ohm s: 80 W (0.01%)
- 4 Ohm : 110 W (0.01%)
Dynamic power
- 8 Ohm : N.B.
- 4 Ohm : N.B.
Total harmonic distortion: N.B.
Attenuation factor: N.B.
Frequency response: 100 kHz high frequency protection circuit switches off at about 40kHz.
Signal-to-noise ratio: 102 dB at 5 W and 100 ohm Source resistance
Stereo channel separation: 87 dB

8 Ohm : 80 W (0.01%)
4 Ohm : 110 W (0.01%)

8 Ohm : N.B.
4 Ohm : N.B.

Die-cast aluminum housing also represents the heat sink
Toroidal transformer, for reducing magnetic interference in the amplifier circuit, shielded by additional housing
Can be switched on remotely by control cable via V32
Electronic protection circuits effective at:
- High frequency, DC voltage at Speaker output
- Overtemperature Power amplifier transistors
- Overtemperature Power transformer
Defect of a device fuse on the power amplifier board is indicated by LED.