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 | 12AY7 | frank.pocnet.net ↗ |
| Tung-Sol | 12AY7 | frank.pocnet.net ↗ |
| General Electric | 12AY7 | 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=-4 V → Ia=3.0 mA, gm=1750 µmho, µ=44
- Source
- RCA Receiving Tube Manual RC-19, 1959, average characteristics
- File
- models/12ay7.inc ↗
See these parameters drawn: the load line explorer plots the 12AY7's plate-curve family from this model and solves an operating point on it.
Maximum ratings
Design-centre values, each unit. The 10 mA cathode-current ceiling is generous next to the 3 mA a tweed input stage actually draws.
- Plate voltage
- 300 V
- Negative grid bias
- 50 V
- Positive grid bias
- 0 V
- Plate dissipation
- 1.5 W
- Cathode current
- 10 mA
- Peak heater-cathode voltage
- 90 V either polarity
- Rating system
- Design centre — carries an allowance for manufacturing spread
- Source
- RCA 12AY7 data sheet, 1 April 1953 (tentative data), design-centre values, each unit ↗