Code 641 R8A5. Mullard Mitcham M8137 CV4004. IA:156% GM:112%. IA:141 % GM:112%. Balanced Tube. Test results This Valve. Fully Tested on the Amplitrex AT1000 Tester. Purchasing from.
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 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
