Discovering this tube felt like an archaeological dig through a massive pile of 12au7s, it wasn’t until I examined it under a magnifying glass that the flat matte plates and long copper rods revealed its true lineage. It turned out to be the elusive RCA 5687 flat plates, a variation I honestly didn’t even know existed until now.
The sound is pure RCA, offering a very rich and creamy texture, but the standout attribute is how it kicks like a mule. The bass response is incredibly fast and superbly strong, providing the true essence of a vintage sonic signature. While it may not completely blow you away, it is an objectively great tube that performs admirably.
Final Verdict: Recommended for those seeking a powerful, classic vintage sound.
Discovering this tube felt like an archaeological dig through a massive pile of 12au7s, it wasn’t until I examined it under a magnifying glass that the flat matte plates and long copper rods revealed its true lineage. It turned out to be the elusive RCA 5687 flat plates, a variation I honestly didn’t even know existed until now.
The sound is pure RCA, offering a very rich and creamy texture, but the standout attribute is how it kicks like a mule. The bass response is incredibly fast and superbly strong, providing the true essence of a vintage sonic signature. While it may not completely blow you away, it is an objectively great tube that performs admirably.
Final Verdict: Recommended for those seeking a powerful, classic vintage sound.