Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filedfiledCritical
Application grantedgrantedCritical
Publication of NL33567CpublicationCriticalpatent/NL33567C/xx
H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
H03G9/04—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes
H03G9/10—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for tone control and volume expansion or compression