Siemens Ribbed Plate 12AX7 ECC83 Vacuum Tube The Rainbow Strings This hardcover book is in

This hardcover book is in very good condition

9 for Tube One and 33

We also have Soviet-era tubes to go with it

Side Four is more like a 6

Siemens Ribbed Plate 12AX7 ECC83 Vacuum Tube The Rainbow Strings This hardcover book is inThis 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