Ecc 83
If you have the amplifier open, and you have a new ECC83, you only have to pull the tube up. Before opening a tube amp. unplug the amplifier, because these things work with high voltages. Let the tubes cool down, before touching. They become very hot. We used to gave a steel like net, we could push over a tube end then could pull it, without chance of burning our fingers.
What makes you think the tube is defect or should be replaced in the first place? They can work for ages.
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