Pilgrim wrote:

Thyratrons were gas filled tubes used for control of AC current. They
were the forerunner of SCR's.

Chuck P.

Not all Thyratrons had anything to do with AC. The CPS6 radar used
a bank of (some number)C22 Hydrogen Thyratrons to pulse the
Magnatrons and that was definitely a DC operation. As I remember it
(a very long time ago) there was a bank of 4 in a series parallel
configuration.
( Boy 1953 was a long time ago ) :-)
...lew...