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Dual CV 1160

Integrated Stereo Amplifier

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Dual CV 1160

Specifications

Power output: 35 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 45kHz

Total harmonic distortion: 0.04%

Input sensitivity: 3mV (MM), 250mV (line)

Signal to noise ratio: 75dB (MM), 92dB (line)

Speaker load impedance: 8Ω to 16Ω

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Reviews

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Reviewed Mar 14th, 2017 by emil658

Nice a good amplifier. After more than 20 years the leds of the input selector sometimes switched off and the amp didn't work. The cause was in the power supply zone. R31 dissipated 1,2 W and R32 1,8W (both rated 2W) were very hot and they melted their welding with the PCB. Solution to cut those resistors and to connect them aerially with their connections (C21 - R1550 and C22 - R1548)

 

Comments

re: CV 1160

The CV 1160 has been given me a good service and good sound for more than 30 years, until one day the input selection knob leds were blinking on/off when I operated this knob.
Initially, I though it was a contact problem of the selector, but it wasn't, it was releated with the excesive temperature of some power supply components
Thanks to hifiengine service manual, and also to a good Dual scheme, I was able to folow voltages and repair the problem.
It happen than the +15V and -15V power supply componentes are all together (R31 330 ohm 2W, R32 470 ohm 2W, 15 V zener diodes D7,D16).
R31 was dissipating 1,8 W, R32 1,2 W and the two zener around 1W.
The printed circuit board (PCB) of this zones was burnt and the two resistances were desoldered, having intermitent contacts.
Easy Solution. to cut R31 and R32 and replace them by resistenace of the same value and power but aerially soldered to a cold place (the first one to one leg of the big capacitor C21 (+26V) and the other to C22 (-26V)) and from there to the corresponding zeners pins (D7, D16) using two wires.
There is a mistake in the scheme D7 and D16 are reversed.
Br. Hope this will be help to somebody

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