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DEFOREST AUDION DV-2 DV2 (Type 201-A) VACUUM …
https://www.ebay.com/itm/194629840151
For auction is a DEFOREST AUDION DV-2 DV2 (Type 201-A) VACUUM TUBE. Unfortunately I am unable to test it, it does say tested with a 0.25 on it. This item is part of an estate, so the exact history is unknown. The item is being sold in as is condition. The photos are taken to depict any blemishes, and the specific details of the item.
Huge Selection of DeForest Vacuum Tubes - Vacuum Tube …
http://vacuumtubeemporium.com/deforest-tubes.html
DeForest Audion DV-2 (201-A) Vacuum Tube Valve + Wood Base Ham Radio Receiver $20.95 1910s Marconi Wireless Telegraph Type V 24 WWI Deforest Audio Radio Tube Valve $333.95 Radio Tubes 01A 00A DeForest Brass Base Short Pin Globe for Collection No Test $29.99 12SA7 Tubes (6) Metal RCA Deforest Westinghouse Ken Rad $5.99
DeForest DV-2 Audion Tube (UV 201) 1900's Radio Tube …
https://www.ebay.com/itm/165261558468
Here is a very nice DeForest DV-2 (UV 201) Audion tube in a display socket. The De Forest type DV2 "Audion" is a high-vacuum triode. The ceramic "isolantite" base shell has 4-pins and has a tipped T-shape envelope.
DV 2, Tube DV2; Röhre DV 2 ID19547, Triode, vacuum
https://www.radiomuseum.org/tubes/tube_dv2.html
DeForest uses DV2 as name for the UV201. V stands for the UV-base. In 1922 GE replaces the UV201 with the UV201A, having now a thorium filament. In 1925 this tube comes with a new base and standardised construction (of 1923) for neutrodyne apparatus and is then called UX201A. Cunningham is naming the tube CX301A.
THE DeForest DV-DL TUBES
http://www.bill01a.com/articles/df-dv-dl.htm
The tubes described were the DV-1, DV-6A, and the DV-2. These tubes had nickeled bases marked "DEFOREST AUDION" and carried patent numbers along with a restrictive notice. The bulbs were gettered and had small round orange and black stickers with the type number. The DV-1 shown in Fig. 2 had a tall bulb and a 3 volt thoriated filament.
ONE DEFOREST AUDION Type DV2 Ceramic Base Vacuum Tube ...
https://picclick.ca/One-deForest-Audion-Type-DV2-Ceramic-Base-Vacuum-203639890820.html
ONE DEFOREST AUDION Type DV2 Ceramic Base Vacuum Tube - $50.00. FOR SALE! This is a deForest DV2 Audion vacuum tube. The tube is not 203639890820
Rare 1924 De Forest-Crosley "Trirdyn Special" Regenerative ...
https://greenhillsgf.com/IndexEbay_DeForest-Crosley_Trirdyn.htm
In 1912 Edwin Howard Armstrong coupled the plate of De Forest's audion back to its grid, increasing its amplification and making the tube oscillate and thereby getting frequency selective, in addition to being a rectifying device - three birds …
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