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The most modern testers perform a multitude of the below tests and are fully automated. Examples of modern testers include the Amplitrex AT1000, the Space-Tech Lab AudioTubeTester, the Maxi pre-amp tester and the maxi-matcher (power tubes only) by maxi test and the new, and somewhat more primitive, DIVO VT1000 by Orange Amplification.
A characteristic feature of most tube amplifier designs is the high input impedance (typically 100 kΩ or more) in modern designs and as much as 1 MΩ in classic designs. [19] The input impedance of the amplifier is a load for the source device. Even for some modern music reproduction devices the recommended load impedance is over 50 kΩ.
Automatic test equipment diagnostics is the part of an ATE test that determines the faulty components. ATE tests perform two basic functions. The first is to test whether or not the Device Under Test is working correctly. The second is when the DUT is not working correctly, to diagnose the reason.
An audio analyzer is a test and measurement instrument used to objectively quantify the audio performance of electronic and electro-acoustical devices. Audio quality metrics cover a wide variety of parameters, including level, gain, noise, harmonic and intermodulation distortion, frequency response, relative phase of signals, interchannel crosstalk, and more.
6V6S – A modern production, large plated tube, heater current 500mA, with a higher plate and screen voltage rating. Made by JJ Electronic. 6V6GT(A)(B)-STR – Modern production valve, STR signifying "Special Test Requirement." Claiming to be heavy duty, suitable for high plate voltage.
Tung-Sol created the 6550 vacuum tube, a specialized Hi-Fi audio tube in 1954. The 1956 Hewlett-Packard MODEL 650A Test Oscillator Operator and Service Manual indicated Tung-Sol as a replacement parts designated manufacturer without a part referenced in the specific model.
Those who test and evaluate equipment can be roughly divided into two groups: "Objectivists", who believe that all perceivable differences in audio equipment can be explained scientifically through measurement and double-blind listening tests; and the "Subjectivists", who believe that the human ear is capable of hearing details and differences ...
An aside, as have been a repair tech, (not much with tubes) but from older tech I worked with, tube testers were a joke; that had the purpose to sell tubes. The good tubes would test as bad, and if you tested the new ones they would test bad. And full-fill pointless corporate diagnostic protocols (following steps even after its known to be bad).