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Merren Audio - TUBE TESTERS The behind the scenes truth ...
http://merrenaudio.com/tube_testers
Here are some of my favorite testers: WESTON 686, Russian KALIBR L3-3, English AVO-163, TV2, Tektronix 570, Triplett 3444-A, USM-118B, New London 901A... When these testers are modifed and accurized, they will give identical results within 1% under same operting conditions...
Vacuum Tube Testers For Sale - Audiotubes.com
http://www.audiotubes.com/tubetest.htm
The transconductance testers are usually the tester of choice when you need to match power output tubes, or need an extremely high degree of accuracy by their ability to read the true Gm of the tube under test. Gm testers are usually larger, heavier, more complex in their operations, and more expensive than the emissions type testers.
Alltubetesters.com | Articles | Which Tube Tester should I ...
http://alltubetesters.com/articles/tester_guide.htm
These models are good all-around testers and lower in price. The Hickok models 536, 538, 538A, 539 and the 539A, which was the predecessor to the 539B/C are much better. All these units have the added feature of having two power transformers.
Maximatcher | Audio Vacuum Tube Tester Store and Support
The new upgrade to the classic test station. Introducing the new MaxiMatcher II, a full-featured vacuum-tube test station that measures up to four tubes at a time! The MaxiMatcher is the only tester that allows you to directly compare full sets of output tubes at the same time.
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