Sparton Radio set.

[Geordie McBoyne]

According to the Radimuseum 6TH8 and 6TH8G is the same valve.   Seems that the valve was widely used in France.

http://www.radiomuseum.org/tubes/tube_6th8.html

Peto-Scott Trophy 8:   http://www.radiomuseum.org/r/petoscott_trophy_8.html

From the VWRRR:  https://www.vintage-radio.net/forum/show...hp?t=76926                                                                                                                                               The contributor informs us that the 6TH8 is essentially a Continental ACH1 fitted with a 6.3volt heater.    Info on #3

Geordie McBoyne.