Hi rBuckner,
thanks a lot for your answer. Yes the sound coincides at the click of the relay ... When the amp is cold, I hear for 10 minutes the click of the relay in the speakers then, the sound comes ... Once the preamp is hot, when I turn it off and then turn it back on, there is no more problem ... I checked the 170 amp, the problem does not come from him.
For the CN02 capacitor, I already changed it ... I changed all the electrolytic capacitors ... Could it be that it is a semi transistor?
(sorry for my bad English
)
Morgan
It could be the transistor QN01 2SA564A that can be replaced with a KSA992FTA. But I would be checking for resistors that may have drifted high. RN01 (470 Ohm/1W) could be high and your 22v might not be there at QN01. If you have the 22v, then suspect QN01.
Type Designator: 2SA564A
Material of Transistor: Si
Polarity: PNP
Maximum Collector Power Dissipation (Pc): 0.25 W
Maximum Collector-Base Voltage |Vcb|: 45 V
Maximum Collector-Emitter Voltage |Vce|: 45 V
Maximum Emitter-Base Voltage |Veb|: 5 V
Maximum Collector Current |Ic max|: 0.05 A
Max. Operating Junction Temperature (Tj): 125 °C
Transition Frequency (ft): 80 MHz
Collector Capacitance (Cc): 30 pF
Forward Current Transfer Ratio (hFE), MIN: 250
__________________________________________
Type Designator: KSA992F
Material of Transistor: Si
Polarity: PNP
Maximum Collector Power Dissipation (Pc): 0.5 W
Maximum Collector-Base Voltage |Vcb|: 120 V
Maximum Collector-Emitter Voltage |Vce|: 120 V
Maximum Emitter-Base Voltage |Veb|: 5 V
Maximum Collector Current |Ic max|: 0.05 A
Max. Operating Junction Temperature (Tj): 150 °C
Transition Frequency (ft): 50 MHz
Collector Capacitance (Cc): 3 pF
Forward Current Transfer Ratio (hFE), MIN: 300
Thank you very much for your precious help!
Awesome!