Tung-Sol 6550 Holes in Plate – USA
Genalex KT88 England
Tung-Sol KT170 to be introduced
Exciting news. Tung-Sol is releasing a new tube – Tung-Sol KT170. The tubes are capable of power dissipation of 85 watts (vs 70 watts for it’s predecessor KT150) and can do 300 watts in push-pull mode. This will be a huge tube (137x68mm/5.5×2.6inch)! The availability and exact tech specs are TBD.
A brief history of 12ax7 tubes
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.
Electro-Harmonix 6CA7 Russia
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.
National Union 6SL7 Black Glass
Edison Mazda Light Bulb – early 1900
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
Brimar 6067/12au7 Black Plates
Soviet/Russian Tubes Equivalents
This is a list of Soviet and Russian tubes and their American/European Equivalents.Continue reading