Hi
I have an amplifier mark levinson 33h which uses RN65 resistors in it's power supply.
Since the pcb became black colored shows that those resistors gets hot !!
So my question is do you think it's wise to replace the RN65 by GS-3 resistor? I didn't seen it's low noise in it's pdf data sheet
But the RN65 vishay comment it's low noise-40db
What do you think ???
I have an amplifier mark levinson 33h which uses RN65 resistors in it's power supply.
Since the pcb became black colored shows that those resistors gets hot !!
So my question is do you think it's wise to replace the RN65 by GS-3 resistor? I didn't seen it's low noise in it's pdf data sheet
But the RN65 vishay comment it's low noise-40db
What do you think ???
I think the burning on the board isn't that significant. It's risk vs reward. You could replace the resistors with the same wattage yet raise them off the board to prevent more burning and improve heat dissipation or go up in wattage. You can get Audio Notes best low noise resistor yet personally Vishay metal film is more than good enough. It's the risk of damaging the unit that is the main concern, it happens
While in other respects the RN65 resistors have very good spec. the problem is the low wattage of them.
Vishay realizes this and refers customers to the CMF industrial data sheet for higher power ratings --RN70 are a slightly higher wattage ,
While WW resistors could be fitted they would not come up to the military spec.of the originals even the GS-3 as you suggested while 2/3 watt rating are not on the same planet as the RN65,s when it comes to PPM .
You are not the first here to complain of this on the same amplifier.
Vishay realizes this and refers customers to the CMF industrial data sheet for higher power ratings --RN70 are a slightly higher wattage ,
While WW resistors could be fitted they would not come up to the military spec.of the originals even the GS-3 as you suggested while 2/3 watt rating are not on the same planet as the RN65,s when it comes to PPM .
You are not the first here to complain of this on the same amplifier.
RN65 are metal film, GS-3 are metal oxide (thick-film). I would worry about noise for either really, although metal film is the better of the two.