Here are a couple photos showing examples of my 6J5-family tubes. Running quads of these in the Telemachus will give me any sound signature I'm in the mood for. Admittedly, I mostly use the GEC L63 or Raytheon engraved base tubes.
From left to right: GEC L63 (early Cossor branded, marked as 6C5G - super rare tube and I have 8
), Brimar 6C5 (cool mesh shield surrounds the plate sructure), Raytheon engraved base ladder plate (left) and column plate (right) circa 1930's (I have various branding- Philco/Zenith/Raython/GM Parts), Tung-Sol VT-94A (another rare tube- took me a while to gather 4 matching)
From left to right: Sylvania (branded Zenith),
Sylvania? solid column plate (branded Super Silvertone), RCA solid flat plate (branded GE), Ken Rad 6C5 metal (dual branded as Cossor with cool OEM boxes. Also have some RCA metal can the same way.