Tested! 2 Gold Bond UX-201a & 1 MX-201a Vacuum Tube Lot. Made In🇺🇸1920’s RARE!
USD 119.99 USD
Specifications
| Brand | Gold Bond |
| Type | Triode |
| Country/Region Of Manufacture | United States |
Cunningham is naming the tube CX301A. Tyne page 308ff brings the details of history. Here the main points only: The first tubes RCA is marketing in 1920 are the detector tube UV200 with argon gas filling and the UV201 Amplifier.
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