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Replace the thermostat. Not an uncommon problem. Although there is an adjustment if you remove the thermostat knob and look in the hollow knob shaft where you'll see a place for a precision flat head screwdriver, I have generally found that if the thermostat was working properly at some point, the problem is rarely fixable by adjustment.
I'm confident that the issue is the thermostat. It's the only thing there to regulate temp and from the sound of it, it's not keeping up. The bulbs can gas out and then they're about as useless as an empty soda can as far as temp regulation goes.
Assuming that the pilot is lit, when you turn the thermostat from off to the operating temperature, you should hear a click at some point. If you do not, the thermostat is defective. You can also double check this by detaching one of the two wires going to the thermostat and measuring for continuity between the two terminals. At off it should show no continuity. At 200F or above it should show continuity. This is the most common problem.
If the pilot will not stay lit or if it goes out when you increase the thermostat setting, it is usually a defective or weak thermopile (or thermocouple), or a defective gas valve. If replacing the gas valve, I recommend replacing the thermocouple or thermopile at the same time.
Restate your problem if the pilot won't stay lit or if it goes out when you turn the thermostat up.
Firstly make sure the gas knob is exactly in the pilot mode some are finiky and won't light unless in exactly the right postion. Make sure once lit when pushing down on the pilot knob that you hold it down long enough for the thermocouple to sense the pilot. Barring both of those the most likley culprit is the thermocouple itself is faulty and can easily be removed usally with a couple of screws and a small adjustable wrench.