Dear DIYaudio members,
I am in using a citation 12 power amplifier, and it works fairly well. I changed the electrolytics on the main board and replaced the differential amplifiers for 2x2n5807, and R705/6 for 12k. I also replaced the old trim pots for 5k bourns 25 turns. The problem is that one channel does not go below 14-15mV, whilst the other is fine and will go to 0 if necessary. Set both to 20mV and it does not get very hot, and sounds ok but I was wondering if there is something you think I should be cheking? Thank you
I am in using a citation 12 power amplifier, and it works fairly well. I changed the electrolytics on the main board and replaced the differential amplifiers for 2x2n5807, and R705/6 for 12k. I also replaced the old trim pots for 5k bourns 25 turns. The problem is that one channel does not go below 14-15mV, whilst the other is fine and will go to 0 if necessary. Set both to 20mV and it does not get very hot, and sounds ok but I was wondering if there is something you think I should be cheking? Thank you
I guess, the schematic in post #3 under
citation 12 nur boxen dran = brummen und rauschen
is according your device.
R11, D4, C5 and Q8 forms the Vbe multiplier, and one of this parts is no longer in the right condition.
BTW- I miss a serial resistor to D4, that is very unusual.
check out this thread:
Optimizing the VBE Multiplier
citation 12 nur boxen dran = brummen und rauschen
is according your device.
R11, D4, C5 and Q8 forms the Vbe multiplier, and one of this parts is no longer in the right condition.
BTW- I miss a serial resistor to D4, that is very unusual.
check out this thread:
Optimizing the VBE Multiplier
