Transistors and thermionic valves - OpenLearn - Open University
![6SN7GTB RCA Black Plates Bottom D/[] Getter Matched Tubes Made in USA – Vacuum Tubes Treasures](https://cdn.shopify.com/s/files/1/0616/3775/5127/products/6sn7gtb-rca-black-plates-bottom-d-getter-matched-tubes-made-in-usa-60s-549919.jpg?v=1659189084&width=1946 "6SN7GTB RCA Black Plates Bottom D/[] Getter Matched Tubes Made in USA – Vacuum Tubes Treasures")
6SN7GTB RCA Black Plates Bottom D/[] Getter Matched Tubes Made in USA – Vacuum Tubes Treasures
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