Telefunken Black Diamond 6550
Tung-Sol developed the 6550 in 1955 for use as a servo amplifier and in industrial applications. The 6560 design is based on the 6L6, but with more gain and better stability.
Like the 6L6, the 6550 is a beam power tube design (or power tetrode) that can painlessly deliver 35 watts at its output. Any bass player with an Ampeg SVT knows the beauty of the 6550 sound, as well as the raw power they can deliver. One of the best features of the 6550 is the tube's long life characteristic, which will grant the user fewer tube changes over the years.
Please Note: Telefunken Black Diamond tubes are sold singly. Power tubes will be supplied in matched pairs or quads. Just order the quantity you need. If you want preamp tubes to be high gain or matched, just ask during checkout and we'll get it taken care of for you.
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I like 6550 that has the accuracy of each musical instrument of their detail on the position. although it does not has the power like 88. but I think it is good enough for listening the orchestra
reviewed by: Harv
I use it in the power section of my ARC Ref 5 preamplifier. It gives a fantastically precise stage, massive bass and a nice filled midrange. High clear and in proportion to the rest of the band. It has a little less air to Svetalny Wing C but with more body and a stronger bottom in my application.
reviewed by: Paweł