Telefunken ECC 83/12AX7 Tubes Ribbed Plate X 4 Made In West Germany

For sale is a close matching set of four Telefunken ECC83/12AX7 Ribbed plate tubes. Made in West Germany, these vintage tubes tested extremely well. They all have an "xg" date code on them which signifies that they were manufactured in August of 1960. The tubes were tested on an Amplitrex AT1000. See test results and pictures for further details.

Test Data:

Test Parameters - 12AX7 Setting, Fixed Bias, Automatic. 

Result Format - Plate Current % of NOS Target / Gm % of NOS Target

• Tube 1 Triode 1 - 110/106
• Tube 1 Triode 2 - 115/106
• Tube 2 Triode 1 - 105/106
• Tube 2 Triode 2 - 115/106
• Tube 3 Triode 1 - 100/106
• Tube 3 Triode 2 - 105/100
  
• Tube 4 Triode 1 - 95/100
• Tube 4 Triode 2 - 110/102