Frank, I did purchase a newer bulb and did try your recommendation. Unfortunately it did not work. I would like to replace my transistors with Germanium varieties so I would need to replace the 100, 330 and 680 ohm transistor modules. The 680 Ohm RF has 4 leads but it is hard to find and I don’t know who is a good supplier. Can you provide me with some sources?
Thanks again for your time and I am sorry it took me so long to reply. Please stay safe!