N Cook wrote:

What is the US term for EHT (Extra High Tension) , say more than 1KV ?

B++ ?


B+ is the plate supply, no matter how high the voltage. It is from
the early days of radio:

The 'A battery' powered the filaments.

The 'B battery' powered the plates.

The 'C battery' provided the grid bias.

What do you call the seriously high PDA (post deflection acceleration
voltage) in an oscilloscope or TV, surely something other than B+ ?


B+ is a class of supply, B is high voltage, and + indicates it is
negative ground, so all readings will be positive. Individual supplies
may be labeled: 'Second anode', 'High voltage', 'Focus'. It depends on
the item. You see transmitters with thousands of volts, at high
current. Before the metering it is still B+, and after may be called
the plate supply, or plate voltage.

You need to download the scan of Radiotron Designers Handbook (4th
edition)

http://www.pmillett.com/Books/intro_RDH4.pdf is one source. This is a
25 MB download, but has more about Vacuum tubes than any other book you
will likely find in a single book than any other.

http://www.pmillett.com/ has other books on tubes, as well.


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