The Radio Record AC/VS is an indirectly heated vari-μ screen grid valve or tetrode designed for RF or IF amplification in receivers with AVC or manual grid bias adjustment. It probably dates to the early 1930s before the Vari-μ pentode took over. The screw top cap also suggests early 1930s.The basic operating details are present printed onto the zinc screening paint.![](../pics/acn0088a.jpg)
The two part split base pins.Thanks to Mark Mallison for sending the images.The classic envelope is mm in diameter, and excluding the B5 base pins is mm tall. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | tc | ![](../static/key.gif) g2 | g1 | h | h | k | a |
|
|
Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | ![](../static/key.gif)
| 4.0 | 1.2 | 200 | 100 | -1.5-40 | 3.0 | 0.8 | 0.35M | 3.0 |
|
Updated September 27, 2022.
|
|