Univibe Bulb not bright enough - HELP!

nznat

Member
I have built a univibe.
Here's the thing. When i plug in the power supply, i see the bulb go bright and deep in the flashing, yet about about 1 second it goes more dim, thus the univibe tone doesn't sound correct. Any ideas on power supply issues or what part of the univibe circuit controls the power of the bulb itself?
 
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