Philips 4699 Metalrim Nos Tubes EL6 type Tubes | #218196654
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Platinum matched pair EL6 4699 Mazda Philips rebranded Tungsram, RARE Metal Base | eBay
1piece 4699 El6 Tube To El34 6p3p 6l6 Electron Tube Convert Socket Diy Audio Vacuum Tube Adapter - Home Theater Amplifiers - AliExpress
Tube Classics
Air Pump and Vacuum DC Motor - 4.5 V and 2.5 LPM [ZR370-02PM] : ID 4699 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits
QUAD Adapters 4689 4699 EL6/ EL34 tubes SUB | eBay
Tube 4699 Philips EL6 El 6 Metal Base Valve Lamp load stage NOS NIB PRE EL34 X2 | eBay