Tube Testers
Over last 20 years I have changed more than 10 testers, but last few years I use mostly just these four types: Neuberger RPM370 for plate current, microphonics and curve testing, I-177B for transconductance, Jackson No 637 and Italian 560 for fast testing.
211 VT-4C United Electronics, tested on Neuberger RPM 370 with socket adaptor (giant jumbo socket - octal)
Ua = 600V, Ug1 = -10V.
Testing EL34 Philips Miniwatt Xf4 for plate current ...
Neuberger RPM 370, serial num 102, year of production 1950th. This tester is modified in just one thing, tube rectifiers are changed with silicone diodes and now it's capable to supply 600V plate voltage for testing 211 tubes via socket adaptor.
Testing transconductance Philips EL34
This is Hickok I-177B tube tester, military product from WWII, I use it like mutual transconductance meter, that's very reliable testing method!
Jackson model No 637, dynamic output tube tester
Chinaglia Dino Elettrocostruzioni; Belluno, Italia, Provavalvole 560 tube tester, small, simple and light one. It’s classic “emission tester” cheap and sometimes could be dangerous solution, because it can overstress the tube with too big current. Anyway it could be very useful for fast testing and random testing bigger quantites of same type, if you are not in mood to bring 30 kgs of Neuberger iron with you!
