Someone somewhere decided 10H is a standard, and the audiophiles all followed. I must have 20 chokes and none are 10H, because they are expensive and big at the higher currents. I always go by 2 X 3.14 X 60 X H for the resistance I'll get for a choke. So if for a amp that draws 350ma, I have a 0.85H choke; 2 X 3.14 X 60 X 0.85 = 320 ohms @ 60 Hz and 25 ohms DC and makes very little heat for $6. A 320 ohm resistor at 350ma will drop 112 volts DC and put out 39.2 watts of heat.
I have that book too, never made one of his amps. Some of the schematics are drawn incorrectly (page 147), and some of his power supplies are over-engineered. Look at page 132, and contrast it with the B+ supply on page 142. He also really likes the EF86 (another of "If you use a pentode it has to be a EF86") bah try a 6EJ7. It is a simpler book to read, at least for me, than Morgan Jones, but for schematics, I would stick with Shannon's, JL labs other schematics found here or at DiyAudio.
At first I wanted to be a ET. Now I are one.