So I was going through the book (PDF) and noticed a typo. It has the anode voltages of A2 and A4 the same, to my knowledge they should be linear in terms of increasing voltages. Does anyone know what I should correct the A2 voltage as? I've attached a screenshot of it.
(taken from 'Newnes Guide to Television & Video" 4ed)
(taken from 'Newnes Guide to Television & Video" 4ed)