6Ж4, Tube 6Ж4; Röhre 6Ж4 ID18863, Vacuum Pentode | Radiomuseum.org
The AA8V 6x2 Superheterodyne Receiver - Audio Power Amplifier Schematic Diagram and Circuit Description
6K4_China, Tube 6K4_China; Röhre 6K4_China ID33930, Vacuum P | Radiomuseum.org
6K4 @ The Valve Museum
6K4/6ZY5G/6SG7/6BA6/6K4P/EF93/EK90/6F31 - cheap vacuum tubes prices
6K6, Tube 6K6; Röhre 6K6 ID2699, Vacuum Pentode | Radiomuseum.org
6К4П, Tube 6К4П; Röhre 6К4П ID18809, Vacuum Pentode | Radiomuseum.org
6K4 Tube pour Amplificateur / Préamplificateur (Unité) - Audiophonics
Amazon.com: Riverstone Audio - Tested/Matched Pair (2 Tubes) 7-Pin JAN 5654W Fully-Tested Vacuum Tubes - Upgrade for 6AK5 / 6J1 / 6J1P / EF95 - JAN 5654W Platinum Grade Pair : Electronics
2PCS 6K4 Electronic Tube Valve Vacuum Tube Replacement for 6AK5/6AK5W/6Zh1P/6J1/6J1P/EF95 Pairing Tube Amplifier DIY Preamp Vacuum Tube - Walmart.com
6K4_China, Tube 6K4_China; Röhre 6K4_China ID33930, Vacuum P | Radiomuseum.org
Tube 6K4 (FX tubes put in accessories) - Audiophonics
6К4П, Tube 6К4П; Röhre 6К4П ID18809, Vacuum Pentode | Radiomuseum.org
Tube List (English)
Tube type list
Russian and Chinese Tube Substitutes
6K4 @ The Valve Museum
Amazon.com: Docooler 6K4 Preamp Vacuum Tube, for 6AK5/6AK5W/6Zh1P/6J1/6J1P/EF95 Pairing Tube, Amplifier DIY Preamp Vacuum Tube,2PCS : Electronics
Tube List (English)
Tube type list
Ian Drew, Tube collection Drew, Great Britain (UK), FU-7 Com | Radiomuseum.org
