Hey,
Helping a friend out with a Carver TFM24 power amp.
He recently bought this off CAM, and it had been running perfectly for a couple of week, and then all of a sudden started distorting. I opened it up when visiting him, and couldn’t see anything obvious, so closed it back up and took it with me.
At low volume, sounds as I suspect it should. Nothing is exaggerated, there is no noise, hiss or hum coming from it. But as soon as volume is turned up only a little bit, it starts to distort. Sounds to me like the gain is out of control on it! Sounds like it’s being seriously over driven.
He had the issue with his preamp, and I’m repeating it with mine. Mine works perfectly with other power amps I have on hand.
Anyone have any thoughts where I should start the journey? I’m hopIng it’s not toooooo complicated that I can perhaps help save him the cost and time of sending it to a shop.
Thank you!
P
Helping a friend out with a Carver TFM24 power amp.
He recently bought this off CAM, and it had been running perfectly for a couple of week, and then all of a sudden started distorting. I opened it up when visiting him, and couldn’t see anything obvious, so closed it back up and took it with me.
At low volume, sounds as I suspect it should. Nothing is exaggerated, there is no noise, hiss or hum coming from it. But as soon as volume is turned up only a little bit, it starts to distort. Sounds to me like the gain is out of control on it! Sounds like it’s being seriously over driven.
He had the issue with his preamp, and I’m repeating it with mine. Mine works perfectly with other power amps I have on hand.
Anyone have any thoughts where I should start the journey? I’m hopIng it’s not toooooo complicated that I can perhaps help save him the cost and time of sending it to a shop.
Thank you!
P
Should mention...
I can only find the service manual for the TFM25. It shows two test points on either side where I should be seeing 1mV. Measuring between the two test points, I get zero. From either test point on either side to ground, I'm getting approx 370mV (left side is 10mV hotter than the right side).
Am I understanding the manual properly that I am to measure the voltage from one test point to the other, and adjust for 1mV there, or am I to measure from either test point to ground and adjust to get 1mV? (In which case its waaaaaay hot)
In any case, doesn't matter if I test between the two points or between one point and ground, the measured voltage in either case does not change...
Thank you!
P
I can only find the service manual for the TFM25. It shows two test points on either side where I should be seeing 1mV. Measuring between the two test points, I get zero. From either test point on either side to ground, I'm getting approx 370mV (left side is 10mV hotter than the right side).
Am I understanding the manual properly that I am to measure the voltage from one test point to the other, and adjust for 1mV there, or am I to measure from either test point to ground and adjust to get 1mV? (In which case its waaaaaay hot)
In any case, doesn't matter if I test between the two points or between one point and ground, the measured voltage in either case does not change...
Thank you!
P
