RCA 2A3 vintage tubes are highly sought after, and for good reason. Both the gray-plate version and the black-plate tubes provide exceptional sound for your amplifier. If you're looking for something that will last you a lifetime, and provide richly-textured, clean tones, you can't beat an RCA. Finding the amount of tubes that you need might be a struggle, but it is worth it. For die-hard musicians who derive inspiration from the vintage flair of classic tube amplifiers to audiophiles who know that high-definition makes an enormous difference in music, these tubes are a real audio treat. They provide enough finesse to keep it smooth, yet sufficient power to blow you away.