Mullard Mitcham M8137 CV4004. Fully Tested on the Amplitrex AT1000 Tester. IA:66 % GM: 75%. IA:91% GM:84%. 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 L Amplitrex Tested GM% 81 & 93
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
