Working on a 4ch Kenwood car amplifier with one pair of Sanken 2sa1303 and 2sc3284 BJTs per channel. But, Replacements don't appear to be available at the moment. I have MJL1302 and MJL3281s and they appear to be similar devices.
So, I tried replacing 1 pair. Upon trying to power up the amplifier with my current limited power supply. It appears to hit an 8a limit and then back to 0 repeatedly. I've tried the idle current adjustments as low as possible with the same outcome.
Is it possible that only replacing one pair is the cause and the amp has some sort of circuit that compares left and right? Or, Is it possible that the idle current doesn't have enough adjustment? Or, Are they just not going to work in this amplifier?
The amplifier works with the original BJTs. But, It does have DC offset. The amplifier draws 1.6A at idle and with all 4 idle current adjustments at their highest it only draws 1.8A. So, I'm assuming it's a very narrow adjustment.
So, I tried replacing 1 pair. Upon trying to power up the amplifier with my current limited power supply. It appears to hit an 8a limit and then back to 0 repeatedly. I've tried the idle current adjustments as low as possible with the same outcome.
Is it possible that only replacing one pair is the cause and the amp has some sort of circuit that compares left and right? Or, Is it possible that the idle current doesn't have enough adjustment? Or, Are they just not going to work in this amplifier?
The amplifier works with the original BJTs. But, It does have DC offset. The amplifier draws 1.6A at idle and with all 4 idle current adjustments at their highest it only draws 1.8A. So, I'm assuming it's a very narrow adjustment.