Portrait of a tube

With some, we look inside



This nuclear power plant was made by Ulyanov Russia


So we can talk about 6C33. But here is something different.

Special Red Tubes 5691-5692-5693

Special series 6SN7, 6SL7 and rectifier, intended for use in rockets. Made by RCA

300B history

A HUGE Collection of recent history


How the famous Western Electric glues their tube bases. Mmm...?!


An curious bright emitter tube, which can be used for HiFi at only 350V.


can it replace 12AU7 / ECC82?

6072 ***** (Five Star Series)

Made by General Elecric.

6922-EH Not Gold grid

Electro Harmonix, but just Russian 6922 by Reflektor. Quality was always an issue, and guarantee also. So I have many broken ones to play with. The 'gold' is only on the printing and on the pins. On the grid, I could see no gold.

6922-EH-Gold Grid / Frame Grid

By Tesla, Czech Republic


Secret Audio Tip! Beautiful DHT Triodes, made by Philips, during WW2. Like all WW2 tubes, supreme quality.


Belong to the best tubes ever made


The Last of the Mohicans.

The crown and the end of the famous German post tubes. This tube closes a period which will never come back.

E83CC - ECC803S

Article about the most wanted small tube.

Nagra using E182CC



EF94-717A-403A-408A-6AK6 Family

This is a family of tubes, some in octal base some in 7 Pin miniature, some with 6.3V heater, some with 20V, which have similar tube curves. Excellent Hifi tubes, all of them.

EL34-S ( I found no 'S' inside)

Made by Shuguang, China.

Brand Name. Golden Dragon

GU50 data sheet


The Russian Tank.


This is a giant Russian version of AD1. Unknown, secret tube. Costs even a fortune in the Russian collectors scene.


Why people use 845 or 211 from China, with all those quality problems, such as loose anode contacts, broken heaters, and low lifetime? While you can buy real NOS GM70? I really I don't know!


History of the KT88 tube.



TESLA EL34. NOS from the 1960's.

Made by TESLA, in Rosnov factory.

  PX4 -or the big confusion with the tube data
RS291 tube
RS291 - a BIG 45 tube.

VT-25-A There is no datasheet.