ONE (1) RE-TESTED With a Calibrated(07/24/2023) TV7D/U
1958 MULLARD BLACKBURN for Amperex 'Bugle Boy' Brand
 EZ81 6CA4 Vacuum Tube
with Square Boxed Getter with Seemed Top Glass.
Excellent silk screen White ink. 
In an original Mullard EZ81 / 6CA4 box, marked 'U'

TV7D/U Testing : No Shorts, No Leakage, No Gas, No Micro-phonics apparent
Minimum good on the TV7D/U scale is 40/40. Where a Vintage Factory new
Mullard EZ81 will test 60/60 (60 on each plate of the Full Wave Rectifier 2xplates)

TV7 Settings :
EZ81/6CA4     6.3v EV0-7030 Bias=0  Shunt=59   Switch= A   Press Button=7   Min Good=40 Plate #1.
EZ81/6CA4     6.3v EV0-1030 0 59 A 7 40 Plate #2.



Tube 1:  Etched Code 'B8C' March 1958 - Mullard branded Amperex
'Bugle Boy' - "Made in England"
  Test Results : Plate/Side 1 :  56.4 / Plate Side 2: 57.1


Notes: This tube  tested with balanced plates at 1.3% and 94% / 95.1%
 of average Vintage Mullard factory new for a EZ81/6CA4 tube.



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