Mullard Mitcham M8137 CV4004. Fully Tested on the Amplitrex AT1000 Tester. IA:91 % GM: 93%. IA:83% GM:81%. Test results This Valve.
Mullard Mitcham M8137 CV4004 Box Anode USED Tube I Amplitrex Tested GM% 81
Mullard Mitcham M8137 CV4004 Box Anode USED Tube M Amplitrex Tested GM% 87 & 81
Mullard Mitcham M8137 CV4004 Box Anode USED Tube K Amplitrex Tested GM%75
Mullard Mitcham M8137 CV4004 Box Anode R8A5 USED Tube H Amplitrex Tested GM% 112
Mullard Mitcham M8137 CV4004 Box Anode USED Tube J Amplitrex Tested GM% 106
Mullard Mitcham M8137 CV4004 Box Anode USED Tube E Amplitrex Tested GM% 87
