bulb for Maestro Fuzz Phazzer?

[Rodgre]

I'm repairing a Maestro FP3 Fuzz Phazzer. It is a treadle-controlled phaser, which actually makes it more of a wah (the treadle controls the sweep. There is no LFO).

On the board is a tiny bulb surrounded by 3 photocells. The light isn't working, though I get a voltage across it that changes from about 0 to 1.5v with the sweep of the pedal.

I've tried an LED but it does nothing.
What would any of you suggest I try instead?

I don't have the schematic but I can tell that the light is fed directly from a transistor. There is no resistor in line to remove for a higher voltage (say 3v for and LED).

Roger

[Nasse]

Maybe there is some markings on the lightbulb metal parts, like volts milliamps or something

[Rodgre]

No marking. It's a tiny bulb with no metal base. Just 2 tiny wires. Like a Grain of Wheat-type bulb from a model railroad.

Roger

[LucifersTrip]

I use red 2mm pinhole led's for all my 1.5v fuzzes...only red will work


http://www.futurlec.com/LED/LED2PINRpr.shtml

[MoltenVoltage]

Mouser sells the incandescent lamps from Chicago Electric but they don't come cheap.

Those pinhole LEDs are too cool!

[Rodgre]

Update and more questions:

So I have tried every possible kind of LED/bulb in this circuit to no avail. I definitely get a modulating voltage when I put a meter across the pads where the light should be, but no bulb (ac/dc) or LED will light up in the circuit.  Is it possible that there is voltage but no/very little current? I don't have the schematic, but I was going to try to trace out the LFO circuit. The bulb seems to be driven directly from a transistor. I would swap out that transistor for the hell of it, but I'd rather understand what's really going on.

Is it possible to have voltage but no current?

Roger