Sorry to hear of this development, Pakwong.
However, I feel quite certain that a problem involving the AC power relay not closing within a few seconds after turn-on has nothing to do with the use of the Jensen signal transformer.
Also, the instructions you quoted from the CAT manual, while being applicable to most balanced amps, are not applicable to yours. As you had found when using the adapter cable, and as has been explained earlier in the thread, using the adapter cable (without the Jensen transformer) sacrifices approximately 75% of the amp's power capability, as well as having various sonic disadvantages.
In fact, although it is probably unlikely, and I'm not specifically familiar with the design, I wouldn't completely rule out the possibility that the amp became susceptible to this problem as a result of having frequently been driven into clipping (i.e., being required to exceed its greatly reduced power capability) when the adapter cable was being used for a prolonged period of time.
In any event, it sounds like either the relay or something in its associated circuit needs to be replaced.
Good luck. Regards,
-- Al
However, I feel quite certain that a problem involving the AC power relay not closing within a few seconds after turn-on has nothing to do with the use of the Jensen signal transformer.
Also, the instructions you quoted from the CAT manual, while being applicable to most balanced amps, are not applicable to yours. As you had found when using the adapter cable, and as has been explained earlier in the thread, using the adapter cable (without the Jensen transformer) sacrifices approximately 75% of the amp's power capability, as well as having various sonic disadvantages.
In fact, although it is probably unlikely, and I'm not specifically familiar with the design, I wouldn't completely rule out the possibility that the amp became susceptible to this problem as a result of having frequently been driven into clipping (i.e., being required to exceed its greatly reduced power capability) when the adapter cable was being used for a prolonged period of time.
In any event, it sounds like either the relay or something in its associated circuit needs to be replaced.
Good luck. Regards,
-- Al