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
- No connection
- Internal connection
Viewed from below (socket / wiring side) · octal · basing 7AC
⚡ 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 |
|---|---|---|
| GEC / M-O Valve Co. | KT66 | 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, Vg2=250 V, Vg1=-15 V → Ia=85 mA, gm=7000 µmho (gm test point)
- Source
- GEC / M-O Valve Co. KT66 data sheet, Issue 4, April 1963
- Note
- µ is the grid-No.1-to-grid-No.2 amplification factor (9.5), from the triode-connection gm·ra on the same sheet. KG2 is anchored on the Class AB1 push-pull quiescent point (Vg2=300 V, Vg1=-27 V → Ig2=2.5 mA).
- File
- models/kt66.inc ↗