Hello, i have a old car radio (Blaupunkt FTZ-NR. U 108) AM FM mono, that uses 2 transistors (AD156 pnp, AD157 npn), i need to replace the transistors but its been a headache try to find a replacement.
I found the following info online
Type Designator: AD157
Material of Transistor: Ge
Polarity: NPN
Maximum Collector Power Dissipation (Pc): 8 W
Maximum Collector-Base Voltage |Vcb|: 32 V
Maximum Collector-Emitter Voltage |Vce|: 16 V
Maximum Emitter-Base Voltage | Veb|: 10 V
Maximum Collector Current |Ic max|: 2 A
Max. Operating Junction Temperature (Tj): 85 °C
Transition Frequency (ft): 1 MHz
Forward Current Transfer Ratio (hFE), MIN: 50
Package: TO8
the only equivalent (allegedly) i found searching the internet is NTE131 NTE135 that are also obsolete
i know that i can by on eBay old parts, but i don't want to wait a month just to find out that the transistor is a fake or does not work.
I would appreciate some advice from you guys. THANKs