02-13-2026, 06:09 AM
There does seem to have been another company involved with Mazda as well :
Looking at the 1939 tube datasheet (for the TP25 oscillator mixer), there is a footnote that "Mazda Radio Valves are manufactured in Great Britain by the British Thompson Houston Company of London and Rugby and distributed by the Edison Swan Electric. Co. of Charing Cross London."
BTH were a big operation in their own right back in the day and involved in all kinds of electrical engineering.
Looking at the 1939 tube datasheet (for the TP25 oscillator mixer), there is a footnote that "Mazda Radio Valves are manufactured in Great Britain by the British Thompson Houston Company of London and Rugby and distributed by the Edison Swan Electric. Co. of Charing Cross London."
BTH were a big operation in their own right back in the day and involved in all kinds of electrical engineering.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
