03-10-2017, 11:55 AM
From the 1949 Mullard Valve and Service Reference Manual the possible progenitor of the 3 - 3 amplifier. Like the tone control version of the 3 - 3 the earlier amplifier has tone controls that work through the NFB loop. The EF37 was replaced by the much better EF37A. Electrical characteristics are similar to those of the EF86.
From the Radiomuseum: http://www.radiomuseum.org/tubes/tube_el84.html
Explains how the EL84 became the final development of the series of Philips/Mullard output pentodes.
Geordie McBoyne.
From the Radiomuseum: http://www.radiomuseum.org/tubes/tube_el84.html
Explains how the EL84 became the final development of the series of Philips/Mullard output pentodes.
Geordie McBoyne.
