ECC81 / 12AT7 Brimar 1954 ! black plates GEC A2900 equivalent, NOS (V37/38)

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Pair: 12AT7 / ECC81 made in by Brimar UK; both in  1954

This is a pair 12AT7 / ECC81 produced by Brimar UK both in 1954. The tubes have a bended wire-getter and copper grid posts, see pictures.The screen print is nice and the etched codes are clearly visible. These tubes show no signs of use and are most likely NOS. See pictures. The early Brimar is highly regarded. Very healthy Tubes with matching systems; see test results.

Sonics

The acoustic properties of the black plate ECC81 (Brimar production) are outstanding and widely known. I refer to the threads on the web for more information. The sound of these tubes is equivalent to that of the GEC A2900. These tubes are, like the GEC A2900, remarkable for their air, realism, and seductive warmth, and unfortunately are getting as rare as the A2900 tubes! Excellent preamp valve, low noise, very smooth extended highs, very good in phono stages. 

Balanced and smooth sounding with liquid midrange, recommended! 

 

Test results*

Valve 1 V37	Ia (plate current): Transconductance (Gm): Gas test, Shorts test:	10,2/ 10,0 mA       5,6/ 5,7  mA/V OK	=  NOS =  NOS
Valve 2 V38	Ia (plate current): Transconductance (Gm): Gas test, Shorts test:	10,0/ 10,0 mA 5,4/ 5,5 mA/V OK	= NOS = NOS

  *  For test methods and factory specification read the tube testing page.

 

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