6v pilot lamp

Closest thing I could find.

Lamp # 342 6V AC/6V DC 0.2W 0.04A T1 3/4 blub

from mcmaster.com/products/miniature-screw-base-light-bulbs/voltage~6v-ac/

I replaced two of those fm stereo tuning lamps with two red leds. Still working after 20 years.........

Might be time to consider replacing the bulb with an LED and series current limiting resistor. The mechanical part - mounting the LED - might be a little challenging, but determining the resistor size is straight forward. If you're not sure of that, we can help you here.

Ed

Been hearing that a lot for responses. Since the LED needs I guess 1.5V to be on, and can burn out with too much voltage, it did not seem to be a suitable option.

That is why series resistors are always used. R = (Vin - Vled) / Iled

Arie

Used to be a common part for analog meter illumination, so keep looking. Was once a radio shack number.

RL

Yes, Radio shack # 272-1140

Here's a diagram:

Assuming a red LED you need roughly 1.5 volts applied to it. That means the resistor has to drop about 4.5 volts. We want the current to be 20 mA or less, so we'll choose 10 mA. The formula to determine the resistance is R=E/I where E is the voltage to be dropped and I is the current through the LED. So R = 4.5/.010 That equals 450 ohms, and the closest standard value is 470 ohms, which will work just fine. A 1/8 watt resistor is the smallest trough hole size and may be easier to fit in than a 1/4 watt. It depends on what you have on hand that will physically fit - the resistor will use only about .05 watt

The current through the LED does not have to be exact - anything from say 2ma (often much lower, depending on the LED) to 20mA will light it up nicely. If you want to use a white LED you can. A white LED needs roughly 3.2 volts so the resistor value changes to roughly 280 ohms, which means using a 270 or 330 ohm standard size. I'd use 330.

Ed