Can someone explain the difference between the output tube wiring in the book layout (from the revised book showing only one output tube) and the revised layout on the TAN website? That is, why are they different? Is the book layout incorrect?
Also, I followed the book’s parts list and got the 1k 2W resister that connects to pin 4 in the book layout, which is absent on the TAN layout. Instead, the TAN layout uses a 1.5k resister, R11, coupling pin 5 and 6. Can I use the 1k for that (R11) instead of the 1.5k? What would the effect be? Hope I’m making sense…
What printing of the book do you have? That might help someone at the network identify any discrepancies. The book most of us have used is the two tube version with the addendum that you can find on the Wiki page.
In the layout diagram on the site, pin 1 is connected to ground as some octals have pin 1 the shell which grounds it well. For pin 6, that is simply wired as a patch point for the 1.5K grid resistor. You could wire that directly, but for people using the 5F2A circuit layout board, it is generally a nice connection point. It helps keep wires separate and maximizes the distances between them.
So pin 1 is a ground, pin 6 is just a “terminal” for easy connection.