Four Valve FM Receiver
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6C4 | TOSHIBA | TRIODE AUDIO TUBE At 7 € HT on Electols
Using the Pentode/Triode Tube as the Amplifier/Phase Splitter.
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Sylvania Technical Manual 1959
6C4, Tube 6C4; Röhre 6C4 ID2842, Triode, vacuum | Radiomuseum.org
6AQ6 & 6C4 tube substitutes or elecrically the same tube | GroupDIY Audio Forum
David Newkirk Writings: Enjoying Radio: Seventy-Five Years of the Boosted Pierce
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Sylvania Technical Manual 1959
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12AX7 - Wikipedia
