I have a gas stove that has a thermopile. It is suppose to produce .450 volts DC and drop to .180 volts DC when the thermostat is ingaged. I have replaced the thermopile several times because it fails to produce a voltage high enough to operate the valve to turn on the stove. Is there a way to bypass the thermopile have the thermostat put out the .450 volts DC without the use of a thermopile.

No, the thermopile is a pilot safely device and also allows the gas valve to come on. The themostat doesn't actually put out any voltage, the millivolt from the thermopile just passes through the stat. You need a themostat that is compatible with a thermopile system (millivolt system). A regular themostat will rob too much power for a millivolt system. If your current thermostat is not millivolt compatible, you will need to purchase one that is. Or, if you already have a millivolt stat, and are still having problems, a weak thermopile will cause that also. Hope this helps.