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Sylvania Technical Manual 1949
1949 Portables | OneTubeRadio.com
Preamp tubes
3S4 @ The Valve Museum
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Borden Radio
NOS in Box Philco Early 3S4 Tube - Etsy Denmark
3S4 Philco and Raytheon NOS same build 1940's - 1951 (1 Pair) - Tube World Express | Tube, Vacuum tube, Sylvania
Vintage NOS / NIB Raytheon 3S4 VT-174 Vacuum Tube | eBay
3S4, Tube 3S4; Röhre 3S4 ID431, Vacuum Pentode | Radiomuseum.org
3S4 - GE - TUBE IN OUR STOCK | eBay
3S4 – Tubes R' Us
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1pcs - 3S4 Vacuum Tube USA | eBay
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The GAKKEN Vacuum Tube Radio Ver. 2 | Radiomuseum
Battery Powered Tube Regenerative Receiver
