Tube Talk - German made ECC83/12AX7 (Telefunken, Siemens, RFT)
Here I have 3 examples of the vintage German made tubes, Im only missing Valvo, but that's definitely on my "will get" list of the future :) Hope you enjoy and subscribe for more!

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Tube Talk - JJ Electronic ECC83/12AX7 types. Which one to choose?

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simple tube DC tester ECC81 ECC82 ECC83 explained and compared with AVO VCM163

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Ultra Modulated AM Transmitter Part 93

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How To Make Electron Tubes - P&C Electronics

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Tube Sound Comparison - Mullard VS. Tungsram ECC83/12AX7

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Dr. Z AMA: "12ax7 vs. EF86"

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The Mullard story

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Tube Lab #6 12AX7 Tube Rolling

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Construction methods in tube instrument amps

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The 2N2222: The Legendary Transistor That Won’t Die

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Dynaco ST-70 Original vs. VTA Bench & Listening Test Comparisons - Stereo 70 Tube Amp

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Guitar Amp Vacuum Tubes Part 1: Triodes and Tetrodes

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Build of OTL tube (valve) amplifier

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Tube Sound Comparison - Ei Yugoslavia VS Telefunken ECC83/12AX7

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Vacuum Tubes/Valves by Mullard ~Manufacture for Audio TV Radio

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Why do tubes sound different than transistors?

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Tech Tips Tuesday Dirty Little Secrets

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6550 (KT88) Shu Guang vs Telefunken vs Vintage JAN Tung Sol Vacuum Tubes in Dynaco Mark III

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Why Put A Capacitor Across The Diode? Here's Why!

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