Portrait of a tube

By Jac van de Walle. Last Update:

With some tubes, we also look inside

	6E5P
	6C33 This nuclear power plant was made by Ulyanov Russia
	13E1 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
	310A How the famous Western Electric glued their tube bases. Mmm...?!
	826 An curious bright emitter tube, which can be used for HiFi at only 350V.
	5963 can it replace 12AU7 / ECC82?
	6072 ***** (Five Star Series) Such an excellent low noise tube
	6922-EH Gold Electro Harmonix Electro Harmonix, but just Russian 6922 by Reflektor. Quality, there were many issues, including a bad discussion about no guarantee. So I have many gassy ones to open up, which they did not replace. The 'gold' is only on the printing and on the pins. On the grid, I could see any gold. 6922-EH Gold. Has no Gold grid
	6922-EH-Gold Grid / Frame Grid By Tesla, Czech Republic
	18028 Secret Audio Tip! Beautiful DHT Triodes, made by Philips, during WW2. Like all WW2 tubes, supreme quality, and typical boxes made of old paper.
	AD1. Queen of the triodes.
	C3g-C3o-C3m Belong to the best tubes ever made
	D3a 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.
	The BIG ECC83 tube curves compare. TESLA vs JJ, S&H, EHX, and more. Are the tubes really what they say they are....? ECC83 REPORT
	E83CC Siemens&Halske. 1960 older logo. This is the second most wanted "ECC83" type. Unfortunately a bit rare. . E83CC S&H
	ECC803S. One of the most wanted tubes. Telefunken made 12 Million ECC83. I have a copy of their original factory papers, showing the exact numbers. ECC83 It was one of their best sold ever tubes. Unlike ECC803S, of which much less were made. E83CC - ECC803S
	In case you are looking for a large pentode, with beautiful triode curves, which is available as NOS, for a nice price still today.... E130L
Nagra using E182CC	E182CC
	ECC82/12AU7 -UPGRADE VERSIONS
	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 Hi-fi tubes, all of them.
	EL34-S ( I found no 'S' inside) Made by Shuguang, China. Brand Name. Golden Dragon
	EL84 / 6N14P Comparing Measurements What is better? Ultra Linear in Push-Pull mode, or Single Ended mode. Report by DIpl. Ing. Wolfgang Trinks English Version Deutsche Version
	G-73R the magical mystery tube
	GU50, the Russian Tank.
	GM57 Secret Audio Tip! This is a giant Russian version of AD1. Unknown, secret tube. Costs even a fortune in the Russian collectors scene.
	GM70 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!
	KT88 History of the KT88 tube.
	NF2
	TESLA EL34. NOS from the 1960's. Made by TESLA, in Rosnov factory.
	PX4 -or the Historical MEGA error with the tube data
	Telefunken RS242. A unique tube. 12 Watt dissipation works from already at 150V, but 400V is possible Gain=17 Finest Telefunken quality, this was never a commercial tube. Read more about it
	RS291 - a BIG 45 tube.

	VT-25-A There is no datasheet.
	VT-52 The mystery of the lost data sheet.

With some tubes, we also look inside

6922-EH Gold Electro Harmonix

The BIG ECC83 tube curves compare.

E83CC Siemens&Halske. 1960 older logo.

ECC803S. One of the most wanted tubes.

EL84 / 6N14P Comparing Measurements

Telefunken RS242. A unique tube.

ECC803S.
One of the most wanted tubes.