If you want to repare or updated your studio equipment such as tube recorders, tube microphones, tube pre-amplifiers, power tube amplifier than you can find here some tube types you might be interested in following brands:
Tungsram - Philips - Tesla - RFT - Ultron - Valvo – Radio Technique Compelec - Adzam - Telefunken <> - Siemens - GE - RCA - Radiotechnique - Brimar - Sylvania - Japan - Westinghouse - Motorola - Amperex - Adzam - Honeywell - KenRad - National - Landsdale – Mazda –Thomson/CSF – Mullard – Tronal – Pope – Miniwatt/Dario - National Union - KenRad - CBS - Tung-Sol - Raytheon – STC- Philips/ECG – Western Electric – Electro Harmonix – Sovtek and many more.