Download the complete 6pp Mullard “Made for Music / Valves For Audio Equipment” c. 1960 catalog:
DOWNLOAD: Mullard_Made_For_Music
Products covered, with text, specs, and photos, include: Mullard EF86 (6267) pentode, Mullard ECC83, ECC81, and ECC81 twin triodes (12AX7, 12AT7, 12AU7), EL84 (6BQ5), EL34 (6CA7), and EL37 (6L6) power tubes, and EZ80, EZ81, and GZ34 rectifier tubes (6V4, 6CA4, 5AR4).
There’s plenty of info here, operating points, some basic schematics, etc… good for any tube audio-maker to keep on hand. I stopped by the shop briefly today and was pleasantly surprised that to see that E.Lyon had found this for me… Thanks again! Enjoy…