5 Stars4 Stars3 Stars2 Stars1 Star (46 votes, average: 4.15 out of 5)

“The Svetlana 6550C’s are the best all around 6550 IMHO” Read

5 Stars4 Stars3 Stars2 Stars1 Star (94 votes, average: 3.53 out of 5)

5 Stars4 Stars3 Stars2 Stars1 Star (27 votes, average: 4.22 out of 5)

5 Stars4 Stars3 Stars2 Stars1 Star (30 votes, average: 3.63 out of 5)

“I was undeniably impressed by the extension of midrange in her voice, and the high frequencies seemed to be so lively.” Read

“Gorgeous, detailed midrange, liquid highs with tremendous extension, and tight, natural sounding bass without a hint of looseness or flab” Read

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5 Stars4 Stars3 Stars2 Stars1 Star (65 votes, average: 3.74 out of 5)

“Smooth clean highs, strong deep bass and all the other audiophile words we so endear.” Read

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5 Stars4 Stars3 Stars2 Stars1 Star (14 votes, average: 3.14 out of 5)

“…but they are excellent tubes in my system and the best new production tubes I have tried.” Read

“Penta Labs seem to be the right combination of an organic sound combined with detail and transparency, as in low level information is readily apparent but not shoved in your face. ” Read

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5 Stars4 Stars3 Stars2 Stars1 Star (24 votes, average: 3.46 out of 5)

“Dynamic and realistic sound, but not as subtle and full-up.” Read

“It offers more color, more depth, more refined highs, and a tighter bottom end. The sound is richer, fuller, and more exciting.” Read

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Great report on new and old stock tubes – View Report