Siemens Ribbed Plate 12AX7 ECC83 Vacuum Tube The Rainbow Strings These ten Sylvania 29LE6s tested

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

They tested 53

We also have Soviet-era tubes to go with it

I am playing it in my Pro-Ject Tube Box S phono pre-preamplifier with John Mayall’s seminal "The Blues Alone" album

They measured 44 and 48 where minimum (65%) is 30

Siemens Ribbed Plate 12AX7 ECC83 Vacuum Tube The Rainbow Strings These ten Sylvania 29LE6s testedThis 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