I don't know if GE is still making 6550s, but when I got my Jadis amps in 1990 they were and I had their 6550s in my amps. In the Jadis equipment, the GEs could not hold a candle to the Philips 6550s I got to replace them, nor to the Svetlana 6550Cs I used as well--they were far coarser, brighter and harmonically thin (Michael Gindi in his Sounds Like review of the JA 80s advised that you remove the stock GE tubes ever so gently and throw them into the nearest ocean!). And Tung Sols, if they're the real deal (and there are fakes out there), are light years better, approaching the sonics of my favorite Gold Lion KT88s. Now if GE is still making them, maybe they've improved over time, but at least in my Jadis equipment they were at best ordinary; haven't heard them in other designs. YMMV.
5 responses Add your response