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!