ringading
Well-Known Member
Got this little amplifier for next to nothing. In cosmetically great shape but produced no sound.
I plugged an mp3 player into the main outs and got good sound from there so I am assuming the issues lies likely in the preamp board. The only transistors on the board are 2SC695 according to the SM. Could not find a mention of a replacement here on AK or elsewhere on the web. Before I start looking at components I wanted to get an idea of replacements.
Any suggestions? The replacement for the close 2SC693 was the KSC1845. Would this or the KSC1815 be a decent replacement?
Comparing Specs:
Not sure of the pinout of the 2SC695 yet.
I plugged an mp3 player into the main outs and got good sound from there so I am assuming the issues lies likely in the preamp board. The only transistors on the board are 2SC695 according to the SM. Could not find a mention of a replacement here on AK or elsewhere on the web. Before I start looking at components I wanted to get an idea of replacements.
Any suggestions? The replacement for the close 2SC693 was the KSC1845. Would this or the KSC1815 be a decent replacement?
Comparing Specs:
| 2SC695 | KSC1815 | KSC1845 | |
| Maximum Collector Power Dissipation (Pc) | 0.1 W | 0.4 W | 0.5 W |
| Maximum Collector-Base Voltage |Vcb|: | 20V | 60V | 120V |
| Maximum Collector-Emitter Voltage |Vce|: | 15V | 50V | 120V |
| Maximum Emitter-Base Voltage |Veb|: | 5V | 5V | 5V |
| Maximum Collector Current |Ic max|: | 0.05 A | 0.15A | 0.05A |
| Max. Operating Junction Temperature (Tj): | 150 C | 125C | 150C |
| Transition Frequency (ft): | 75MHz | 80MHz | 50MHz |
| Forward Current Transfer Ratio (hFE), MIN: | 75 | 70 | 200 |
| Noise Figure, dB: - | |||
| Package: | TO50-1 | TO-92 | TO-92 |
Not sure of the pinout of the 2SC695 yet.

