According to Larsen's "The Locator" the following brands have a matching tube line-up:
Automatic (8-8) 6E5 BM42B
Detrola (9-10 and 11-7)) 6G5 BK42BG
Emerson (9-3) 6G5 L42BG
DeWald (9-3) 6U5 L42F
The figures between brackets refer to the schematic in Rider's books (Volume number) resp. page of the particular brand. After the brand names you find the type of the tuning eye and ballast tube.
Thanks,
Joe
jesbrook@jobforce.org