Just a point that may be of interest. Philco never made a tube but they did rebranding. So when br mentions Philcos these tubes were most likely made by Sylvania.
Our company has multiple matched pairs of old stock 45s and one of the owners has over 20 years experience selling old stock vacuum tubes.
National Union is one of our more popular brands. A customer in the know described them as a very nice cross between a Tung Sol and a RCA. FYI.
Our company has multiple matched pairs of old stock 45s and one of the owners has over 20 years experience selling old stock vacuum tubes.
National Union is one of our more popular brands. A customer in the know described them as a very nice cross between a Tung Sol and a RCA. FYI.