RobertL wrote:
On Oct 6, 12:14 am, "Dave Plowman (News)"
wrote:
In article
,
NT wrote:

yes, its inevitable. But be grateful for progress.... Had a blast from
a 1950s tv a few years back, and christ was it bad. Very little cone
travel, stiff paper suspension and probably valve bias way off.
405 line TVs had AM sound with poorly designed IF strips limiting the HF
even more than the transmissions. Although very early ones made some
attempts to get it right.


Surely the 405 line TVs used FM for the sound with AM for the spot
brightness modulation.

Robert

625 certainly did that, not sure about 405 though, Might well have been AM.