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4 X TT21 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: BILLINGTON GOLD. CHINESE PRODUCTION SELECTED FOR BILLINGTON
BLACK PLATES, MATCHED QUAD
TEST RESULTS
88mA EMISSION (EM) 7.8mA/V TRANSCONDUCTANCE (GM)
82mA EMISSION (EM) 8mA/V TRANSCONDUCTANCE (GM)
88mA EMISSION (EM) 8.1mA/V TRANSCONDUCTANCE (GM)
83mA EMISSION (EM) 8.2mA/V TRANSCONDUCTANCE (GM)