Tube Comparison: 16 Brands of 6L6GC Valves On Test

Kurt Prange compares 16 separate variations of the 6L6 power tube   19-Oct-13

Here is a visual comparison of the response of each individual tube, measured in lows, mids and highs.

Test conducted by Kurt Prange.

Kurt Prange (BSEE) is the Sales Engineer for Amplified Parts ( in Tempe, Arizona, United States. Kurt began playing guitar at the age of nine in Kalamazoo, Michigan. He is a guitar DIY'er and tube amp designer who enjoys helping other musicians along in the endless pursuit of tone.

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6 Comments... Comments are closed while we transition to Disqus

GTRman    Said...

If people would spend more time learning the guitar and not analyzing the equipment they would be much better off. A guitar/amp setup only sounds as good as the player.

21-Oct-13 02:12 PM

TONY-THE-ACE    Said...

So True

22-Oct-13 08:06 AM

Bert    Said...

Screw yourselves haters.

27-Jul-14 01:02 AM

nate diggy    Said...

I mean without people who were interested in learning about the equipment and analyzing it then the question arises as to who will build amplifiers with better or just unique qualities. If no one analyzed this stuff and broke it down for the general public most people would prolly just settle for sub par equipment or set ups. I know that my research into the workings of amplifiers and tube characteristics has made my tone/sound better. At some point even the greatest guitar player in the world would sound like shit if his/her amp was a complete piece of shit and sounded like stinky turds lol

27-Aug-14 02:32 AM

niggy nate    Said...

in all respect who says this guy even plays guitar and is not just someone who enjoys learning and teaching about tube characteristics. Amped GUEST blogger kurt says "The purpose of this comparison is simply to provide guitar players with a frame of reference to help in finding the best current production 6L6GC for their needs. Also included in this comparison are direct substitutes for the 6L6GC including: KT66 and 5881."

27-Aug-14 02:35 AM

Ted    Said...

Thank you for this test. I'm doing a series of articles about the Dual Rectifier response, how to modify it, and how to enjoy it stock. This was helpful.

04-Oct-15 12:39 PM

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