Ah! Thanks for the help! I was looking in the wrong place.
So,
On the bad channel, the signal is at the base of Q80 but then it's very small at collector of Q80. This is also happening at Q82 (the other polarity). I thought it's unlikely to be both transistors (Q80, 82) failing but I swapped them with the good channel anyway. No difference. The same channel is still bad.
Q79,80,81,82 are all getting + & - 60vdc on their collectors. And Q75,76,77,78 getting + & - 60vdc on their emitters.
Is there something a miss around Q83, 84?
All the voltages look the same on both channels.
Any thoughts..
Thanks
So,
On the bad channel, the signal is at the base of Q80 but then it's very small at collector of Q80. This is also happening at Q82 (the other polarity). I thought it's unlikely to be both transistors (Q80, 82) failing but I swapped them with the good channel anyway. No difference. The same channel is still bad.
Q79,80,81,82 are all getting + & - 60vdc on their collectors. And Q75,76,77,78 getting + & - 60vdc on their emitters.
Is there something a miss around Q83, 84?
All the voltages look the same on both channels.
Any thoughts..
Thanks