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Get familiar with the reaction system: Introducing the Reaction System

NOS tubes...

It appears I have 7x Siemens D3A/7721 vacuum tubes. I have no use for them. They were popular in vinyl preamps because of their high gain. These are the orange-boxed straight-tubes without pinches, and appear to be new. As I said- I have 7 of them. They are going for some serious money on the bay.

Make me an offer, shipping to lower 48 only, or I can bring them to InDIYana 2021 in LaPorte...


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