yeah…a really shitty circuit, took fkin ages!! I had to run at 29V and kick start it by pulling and reconnecting a jumper to the emitter of the 2nd pnp tranny. If I dropped voltage below 24V it would stop again…2nd probe would also cut it off on contact. Total pain and batshit noisy. The resistor values aren’t close enough to my transistor 0.7V turn on – got mostly 0.56V at the bases, hence higher voltage req.