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

but that was the fashion back in the 1940s

This hardcover book is in very good condition

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

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