What are the GOOD tube testers that test trans-conductance? I mean, I am looking for a good tube tester that tests the tubes properly by putting a good load on them with Hi voltage.. Companies and models of some of the good ones would be nice! I was offered an upright model the other day on a stand and it is light blue metal with a poster size backing on it I have been told they used to have them in TV stores and such in the 60's. I just don't want one that will just test filaments..Thanx Brian

Hi,

Try this link for english information:http://www.oldradios.de
If you are able to understand German try this link:
http://members.tripod.de/Jogis_Roehrenbude/index.html
Jogi shoes you, how to build a tube tester and regenerator. But its german only, but you find original plans to build them.
A Tubetester is called Roehren-Pruefgeraet. Here you find Plans and Pictures from a Tube tester:
http://members.tripod.de/Jogis_Roehrenbude2/Bastelschule/Roehren-Pruefgeraet.htm

Actually I said trans-conductance I meant mutual conductance!!

: Hi,

: Try this link for english information:http://www.oldradios.de

: If you are able to understand German try this link:

: http://members.tripod.de/Jogis_Roehrenbude/index.html

: Jogi shoes you, how to build a tube tester and regenerator. But its german only, but you find original plans to build them.

: A Tubetester is called Roehren-Pruefgeraet. Here you find Plans and Pictures from a Tube tester:

: http://members.tripod.de/Jogis_Roehrenbude2/Bastelschule/Roehren-Pruefgeraet.htm

Transconductance is technically correct, replacing the original "mutual conductance" coined by Alan Hazeltine, but the old term never died out.

Excuse the plug, but there's a good rundown on these things in "Tube Testers and Classic Electronic Test Gear."