|
12SF7Sensibly equivalent¶ to:CV921
|
|
|
The 12SF7 is a diode pentode for RF and IF amplification. The valve has a variable-μ characteristic and the diode is intended for use as an AGC detector.Command radios of WWII like the R-23 and R-23A used the 12SF7 as second IF stages with their own local AGC.![](../pics/aaa1711a.jpg)
The RCA logo.The thin metal tube envelope is 25 mm in diameter, and excluding the IO base pins is 52 mm tall.Reference: Data-sheet & tuberadio Type 12SF7 was first introduced in 1940. See also 1940 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ![](../static/key.gif) m | g1 | k,g3,s | g2 | a(d) | a | h | h |
|
|
Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | ![](../static/pdflogo.gif)
| 12.6 | 0.15 | 250 | 100 | -1 | 12.4 | 3.3 | 0.7M | 2.0 |
|
Updated January 11, 2017.
|
|