John Curl's Blowtorch preamplifier part II

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I have just wandered in classes at several universities nobody checks identity. Even spent time at Cal Poly helping in the lab after wandering in with a friend who was a student. The professors are quite helpful with specific questions especially UC schools as part of their charter is to help industry. Of course I had less grey hair then and maybe looked more like a student.
 
I have just wandered in classes at several universities nobody checks identity. Even spent time at Cal Poly helping in the lab after wandering in with a friend who was a student. The professors are quite helpful with specific questions especially UC schools as part of their charter is to help industry. Of course I had less grey hair then and maybe looked more like a student.

I had a few former-military types that were definitely in their 40's that I taught. Dunno if you qualify age-wise, but I wouldn't really bat an eye.
 
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