Ei Yugoslavia EL34 6CA7 Tube • Class A Tested

Solid Tube. See the test results!

*Tested @ Tube Manual Class A Parameters

Read below to get more information about us and our testing procedures!

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Our vacuum tubes are always tested on three or more individual testing devices. uTracer3+ (curve tracer and tube tester up to 400 Volts 200mA), uTracer6 (curve tracer and tube tester up to 1000 Volts 1A), (2)EICO 667, TV7/B, Hickock 600A, 800A, BK 607 and a host of other test equipment. This allows us to test vacuum tubes in a large variety of ways that are better suited for a particular application. For example, if you want power tubes for a Class AB amplifier, those power tubes / output tubes need to be somewhat matched (% advice varies from person to person say 10% or better) in output at a certain operating point during the amps normal operation. That could be 300-500 Volts. To get the best results for matching, the amp itself is always the best test. The second best (our personal opinion) process for matching these tubes is a curve tracer that can plot out a graphical representation called a "curve". Each tube in a matched pair can have its curves traced at certain bias points. The results from each tube can be compared to see how close they are at different operating points. We superimpose the curves in our uTracers software.

*Our Voltages are Regulated Voltages*

In addition, curves can then be referenced to the vacuum tube manual (or a data sheet readily available with a google search) to compare* it with the typical curves shown there for a "Bogey Tube". Curve tracers in themselves, semiconductor (transistor) OR vacuum tube, are design tools for the amp builder and audio / tube amp designer.

We also Class A Test All Audio Tubes For Test Result in our listings unless otherwise specified! This means we use the parameters in RCA Receiving Tube Manual,

GE Tube Manual, etc, or from data sheets.

*NOTE: Tube manufacturing tolerances were very large, as high as 40%! That means a new tube could read very low and still be considered good (look at any tube tester that has a "Bad Good" scale, and notice how large the "Good" is overall). A "Bogey Tube" is a vacuum tube that matches the Vacuum Tube Manuals numbers are better.

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Shipping

The item will be packaged in the original box (if applicable) and then sent out in a separate shipping box. We use USPS or FedEX shipping services. Please contact us for special shipping needs.

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