On offer are a matched pair of 12AU7 / CV4003 British military twin triode tubes made by PHILIPS / MULLARD at their Hendon Australia CV manufacturing line .
The CV4000 series utilised 10,000 hour cathodes so one could expect quite a long lifetime from this NOS NIB stock .
In original PDA boxes & fitted with pin protectores / straighteners the have identical codes KB / PDA , PDA being the Government code for Hendon , Australia .
They also have the etched code GF C9E , C being another Hendon ID .
TEST DATA
AVO 160 Tester
Vf=6.3 v,Vp=250 v & Ip=10.5 mA . Book value gm=2.2
TEST RESULT
Both tubes measured gm=2.2 / 2.2 , tightly matched at exactly new spec.
SHIPPING $4.99 from Australia .
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