Basing (pinout)
Bottom view — the socket as you see it from the wiring side. Hover, tap, or focus a pin to name it. Read from the datasheet basing diagram (how to read these →).
Hover, tap, or focus a pin to name it.
- High voltage (B+)
- Control grid
- Cathode
- Heater / filament
Viewed from below (socket / wiring side) · noval 9-pin (B9A) · basing 9A
⚡ Oxblood pins sit at B+ — hundreds of volts in service, lethal, and still charged after power-off.
Datasheets
Primary manufacturer data, via public tube-data archives. The model below is fitted to the tabulated "average characteristics" in these sheets; the datasheet files themselves are linked, never rehosted.
| Publisher | Type | Source |
|---|---|---|
| RCA | 12AT7 | frank.pocnet.net ↗ |
| General Electric | 12AT7 | frank.pocnet.net ↗ |
| Mullard | ECC81 | frank.pocnet.net ↗ |
Circuit Codex model
A CC0 ngspice model in the Koren form, fitted here to the published anchor — no parameters copied from other model collections. Methodology →
- Anchor
- Va=250 V, Vg=-2.0 V (200 Ω cathode bias) → Ia=10 mA, gm=5500 µmho, µ=60
- Source
- RCA 12AT7 data sheet, March 1, 1954, tabulated Class-A1 characteristics
- Note
- Single-anchor Koren fit at the 250 V tabulated point (KP, KG1 solved to reproduce the plate current and transconductance; MU=60 and EX=1.5 fixed). The sheet's second tabulated point — Va=100 V, 270 Ω cathode bias → 3.7 mA, 4000 µmho — corroborates µ=60 and is not separately fitted.
- File
- models/12at7.inc ↗