I have this amp apart recapping it and don't really want to go back in there for a really long time so am replacing the indicator lamps but cannot find a voltage or current rating in the service manual parts list. By the attached schematic I'm assuming that they need to be 5v? Any foreseeable problems if I use led's?
Attachments
You'd have to change the series resistor for each lamp to properly limit each LED current to 10mA or less.
To do that you first need to determine for certain the DC voltage driving them.
To do that you first need to determine for certain the DC voltage driving them.
It appears that any of these lamps is fed from a 5 Vdc rail. As rayma said, change the 1 ohms series resistors accordingly, but check the polarity first. And note that the two LEDs at the leftmost position need individual series resistors.
I'm very fond of replacing proprietary and now obsolete incandescent lamps by LEDs in my old gear. Just the day before yesterday I had my beautiful Dual CV 1460 amplifier (that I'm about to sell) on the workbench, whose three dial and meter lamps had become very dull. I replaced them by three warm coloured, but very efficient LEDs and rearranged the supply by adding a rectifier bridge and two paralleled 1.5 µF series capacitors that feeds them off 32 Vac. Both capacitors now are in the position of the two original 4R7 series resistors for the lamps. SM of this unit is here: Free download Dual CV 1460 Service Manual
Best regards!
I'm very fond of replacing proprietary and now obsolete incandescent lamps by LEDs in my old gear. Just the day before yesterday I had my beautiful Dual CV 1460 amplifier (that I'm about to sell) on the workbench, whose three dial and meter lamps had become very dull. I replaced them by three warm coloured, but very efficient LEDs and rearranged the supply by adding a rectifier bridge and two paralleled 1.5 µF series capacitors that feeds them off 32 Vac. Both capacitors now are in the position of the two original 4R7 series resistors for the lamps. SM of this unit is here: Free download Dual CV 1460 Service Manual
Best regards!