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World Audio Design KIT 6550 & KAT 6550 JJ Full Revalve Kit
https://www.watfordvalves.com/product_detail.asp?id=3552
The World Audio Design Kit and Kat 6550 amplifiers are one of my favourite sounding 6550 designs and offer remarkable value for money. Our JJ revalve kits consist of a specially selected set of JJ that will provide an outstanding upgrade to this amp. JJ valves are renowned around the world for their sound quality.
A Single-Ended 6550 Amplifier - audioXpress
https://audioxpress.com/article/a-single-ended-6550-amplifier
In this article, the 6550 is used in a clean, sweet-sounding, single-ended design. The amplifier has very few parts, is easy to build and repair, and the cost of the project is nominal when you consider the kind of sound that is produced. This article was originally published in audioXPress, September 2001. Many articles have appeared regarding projects using one of …
Auris Audio Fortino 6550 integrated amplifier - Hi-Fi+
https://hifiplus.com/articles/auris-audio-fortino-6550-integrated-amplifier/
Which is why the Auris Audio Fortino 6550 is the perfect modern valve amp. Auris Audio is one of a number of brands coming out of Eastern Europe. This Serbian-based company first hit our particular radar screen thanks to its excellent headphone amplifiers, but we quickly realised this is just a toe in the Auris waters.
Test Reviews - Watford Valves
https://watfordvalves.com/cgi-bin/documents/testreport_42.pdf
6550-EH/SOVTEK 6550WE: The Sovtek 6550 WE has been around now for over 6 years and has a proven reliability record. The valve has a warm bass response with a tendency to sound a little top end heavy. In audio the bass was a little muddled and it lacked some of the slam that the original Svet 6550C displayed. The mid range
Glow in the Dark Audio - Don Allen SE 6550 / KT88
http://www.glowinthedarkaudio.com/don-allen-se6550.html
Don Allen SE 6550 / KT88. Don Allen is an underground legend in the hifi tube amp world. His classic builds and reputation for supreme sounding amplifiers have graced many an audio forum for two decades or more.
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