Hi all,
I have acquired a nice old Rotel RB-850 power amp.
Upon testing it I have noticed that the right channel is a lot quieter than the left.
There is no hiss or hum from the speakers, and everything sounds "fine", apart from the imbalance.
I have measured the DC offset at the speaker terminals after letting the amp settle for 10 minutes and each channel measures around 15mV.
Before I open it up and poke around inside, is there anything in particular I should look at? Is this a symptom of bad caps?
Thanks!
I have acquired a nice old Rotel RB-850 power amp.
Upon testing it I have noticed that the right channel is a lot quieter than the left.
There is no hiss or hum from the speakers, and everything sounds "fine", apart from the imbalance.
I have measured the DC offset at the speaker terminals after letting the amp settle for 10 minutes and each channel measures around 15mV.
Before I open it up and poke around inside, is there anything in particular I should look at? Is this a symptom of bad caps?
Thanks!
Thanks - I will check the switch and spray it with contact cleaner. Is this likely to be the cause?
Its the right channel that has the switch for bridge mode --S1 if that is faulty then as the above post bypass it to see if that makes any difference ----or not.
If the voltages are okay on the right channel =41.6 V +/-DC then before you start to investigate make sure the input signal is equal on both channels ( reverse the inputs to see if the left channel goes dimmer ) .
If all okay get back.
If the voltages are okay on the right channel =41.6 V +/-DC then before you start to investigate make sure the input signal is equal on both channels ( reverse the inputs to see if the left channel goes dimmer ) .
If all okay get back.
other than changing the bad caps,
cleaning the contact points of the switches, especially the speaker protection relay contacts might help.
cleaning the contact points of the switches, especially the speaker protection relay contacts might help.