CV4024, BRIMAR, MIL SPEC ECC81, MATCHED PAIR , MAY 1967 ROCHESTER MANUFACTURE
CV4024, BRIMAR, MIL SPEC ECC81, MATCHED PAIR , MAY 1967 MANUFACTURE
On offer today is a lovely matched pair of Brimar Rochester CV4924 manufactured in May 1967 Carrying good white print, they tests as excellent using my AVO Valve Characteristic Meter VCM163 with the following results: At Va = 250V Vg = -2.0V
V1: Section 1: Ia = 10.0 mA; gm = 5.5 mA/V
V1: Section 2: Ia = 10.0 mA; gm = 5.5 mA/V
V2: Section 1: Ia = 10.0 mA; gm = 5.1 mA/V
V2: Section 2: Ia = 11.0 mA; gm = 5.3 mA/V
The specification for a new/100% emission valve is:
Ia = 10 mA; gm = 5.5 mA/V
As you can see, this result show a strong pair of valves, well matched both inter valve and also showing excellent matching of each triode section within each envelope.
