CV4024, MATCHED PAIR OF MULLARD MITCHAM MIL SPEC ECC81, 12AT7WA, SAME DATE CODE, FROM 1978

On offer today is a lovely matched pair of Mullard Mitcham CV4024, a premium quality ECC81 carrying the date code for 1978. Carrying slightly smudged white print, it tests as excellent using my AVO Valve Characteristic Meter VCM163 with the following results: At Va = 250V Vg = -2.0V U20: Section 1: Ia = 11.0 mA; gm = 6.0 mA/V U20: Section 2: Ia = 11.0 mA; gm = 5.8 mA/V U22: Section 1: Ia = 13.0 mA; gm = 6.5 mA/V U22: Section 2: Ia = 12.0 mA; gm = 6.0 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.
Stock Code: u20/u22
Availability: Out of stock
Delivery date: 1 week
Manufacturer: Mullard
HK$348.91

On offer today is a lovely matched pair of Mullard Mitcham CV4024, a premium quality ECC81 carrying the date code for 1978.       Carrying slightly smudged white print, it tests as excellent using my AVO Valve Characteristic Meter VCM163 with the following results: At Va = 250V Vg = -2.0V 

U20: Section 1: Ia = 11.0 mA; gm = 6.0 mA/V

U20: Section 2: Ia = 11.0 mA; gm = 5.8 mA/V

U22: Section 1: Ia = 13.0 mA; gm = 6.5 mA/V

U22: Section 2: Ia = 12.0 mA; gm = 6.0 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.

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