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Nostalgia Air: Tube Substitution for 6550
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8438 Eimac Made in USA Vintage Power Tetrode Tube 4-400a Qb4/1100ga Cv3879 for sale online | eBay
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8Pins Bakelite Tube Socket GZC8-B Vintage Valve Socket For KT88 6SN7 6V6 6L6 EL34 6N8P Vacuum Tube Amplifier DIY HIFI Audio - AliExpress
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TDSL Tube data [6550]
