A Brimar 12AX7 valve. Test results and description are below.
Red print - there is a very old label on the glass which can be removed carefully
17mm closed black plates with single staple
Silver rods
45 degree slanted square getter welded to top of anode
Date code: 4D5/573 for April 1955
Test results:
0.9 / 1.80 : 0.9 / 1.90
Ia = EM 1.20 mA = GM 1.60 mA/V
Tested on the Amplitrex AT1000. Unpacked weight is 0.010 kg.
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