Building Dr. Clark’s zapper

I downloaded the instructions, etc. on how to construct Dr. Clark’s zapper from ‘http://www.drhuldaclarkzapper.com/howto.htm’ and procured the recommended components from a local RadioShack. On two separate and independent (different components, alternative procedure, etc.) occasions, I constructed the device and measured a consistent 4.4 – 4.5v, well below the recommended 7 - 8v per the web instructions. Prior to the second construct, I tested each component’s integrity and consistency and double-checked for adherence to the circuit schematic. I do not have access to an oscilloscope and consequently not able to test the frequency output. For those who made their own zappers, Thinking, Hermit, etc. can you say what voltage output you obtained with your zappers and if you deviated any from the recommended schematic?

Thank you,
rozz.
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