That particular schematic I think got revised at some point.
For a 5670, 9.5mA of current and 150V on the plate would be 1.5V of bias and a cathode resistor of about 160 ohms. You could use an HLMP-6000 diode here for this.
With 3.2V of bias and 9.5mA of current, you'll have more like 225V of B+. That's OK too if you want.
In either spot, rp is about 6K, so the 15K output transformer makes a lot more sense than a 10K output transformer.
There are a great many other 15K:600 output transformers available, many of which are still in production.