The 12ax7 tube is arguably the most popular audio vacuum tube that has ever been created. It’s popularity is driven by use in many Hi-Fi tube amplifiers and especially guitar amplifiers, where it’s pushed really hard and burns out fairly quickly. Introduced in May of 1947, the tube gained almost immediate popularity due to its very high gain – mu: 100, so it amplifies voltage 100x! Although I’ve seen JJ and Sovtek 12ax7 tubes go as high as 115, but that’s not up to spec.
Nikolay sent me a matched quad some time ago. The matching process that he uses produces a very tight set, which is very important if you have a fixed bias amp like I do. Closer the match, the happier the amp – simple as that.
Alright, I know that this not a tube, so no need to point that out 🙂
In one of many tube shipments, I found an unexpected treasure – original Edison Light Bulb from the early 1900s.Continue reading
This is a list of Soviet and Russian tubes and their American/European Equivalents.Continue reading
Great review of 6dj8/6922/7308/CCa tubes from Audiofool
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