1 X 6688 GENERAL ELECTRIC TUBE. 1970s PROD. 14. CE808 | eBay
GE 6688 VACUUM TUBE NOS & TESTED | eBay
Tube NOS Mullard E180F/CV3998/6688 — Parts Connexion
Mullard E180F / 6688 Tube (1) | eBay
300B schematic recommendations | diyAudio
JAN-6688=E180F Mullard branded Philips Holland gold pins 1966 (12.5ma)
Brand new (gold feet) WF EF861 electronic tube upgrade 6J9 6688 6j9 The sound quality is full and sweet, precise pairing. - AliExpress
Tubes-Store.com → Other tubes → 6J1P-EV / 6Zh1P-EV / 6AK5 / EF95 / 6F32 / 6J1 Voskhod tube
One 6688 Tube, By G.E., Gold Pin, New | eBay
ElectronTubeStore.com
E180F / 6688 GOLD PIN Philips
Tubo electrónico de la nueva Unión Soviética, 6 metros, 9 generación, 6J9, 6688, E180F, E186F, 6j9 - AliExpress
6688 Good Feng Shui!" Headphone Amplifier - diyparadise
Tubes-Store.com → Other tubes → 6J9P-E / E180F / 6688 tube
6J11P-E / E180F / 6688 Russian Tubes Lot of 10 NEW
6688 / E180F
NOS Tube Store: Amperex JAN CEP 6688 / E180F
6688 GE 5 Star Pentode , New Old Stock
Tubes-Store.com → Other tubes → 6J9P-E / E180F / 6688 tube
6688 GE NOS 1966 (9ma)
Tubes-Store.com → Other tubes → 6J11P-E / E180F / 6688 tube
1PCS New American 6688 tube upgrade 6J9/6m9/EF180/E180F/6J9 tube
Amperex 6688 Vintage Electron Tube w/ Gold pins, Strong | eBay
Siemens E180f 6688 c 1960 - NOS telefunken v72-a tab tube microphone preamplifier original vintage | Reverb
6688, Tube 6688; Röhre 6688 ID19673, Vacuum Pentode | Radiomuseum.org
6688 @ The Valve Museum
One Pair Rare CV3998 (6688) Tubes by GEC of England, Gold Pin Class | eBay
Tubes-Store.com → Other tubes → 6J9P / 6Zh9P / E180F / 6688 tube
