Siemens Ribbed Plate 12AX7 ECC83 Vacuum Tube The Rainbow Strings This Raytheon 12AZ7 dual triode

This Raytheon 12AZ7 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

9 for Tube One and 33

These ten Sylvania 29LE6s tested to spec on our Paul Hart-calibrated TV7/U

but that was the fashion back in the 1940s

Side Four is more like a 6

Siemens Ribbed Plate 12AX7 ECC83 Vacuum Tube The Rainbow Strings This Raytheon 12AZ7 dual triodeThis Siemens ribbed plate 12AX7 ECC83 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they measured as follows: It measured a perfectly balanced 44 44 where minimum (65%) is 32 32 and 100% is 49 49. It has copper support rods; 12MM ribbed plates; excellent flashing and an O getter with two rather than one supports. It has the requisite Siemens stamped metal plate just above