← Browse Telefunken Low quality — significant gaps in core data (missing base, heater, universal parameters, or pins). Treat as a research stub; always cross-reference with datasheets.
Known Equivalents & Substitutes
Similar Tubes (Not Drop-In Compatible)
Similar Philips rectifier but different base (P8A) — not pin-compatible Same type with different bulb shape Rimlock-based successor introduced in 1947 Electrical Specifications
Absolute Maximum
Anode Voltage (max) AC Voltage per Plate (max RMS) 500V
Rectifier
Max C-input Filter Capacitor Max C-input Filter Capacitor 60µF
DC Output Current (max) DC Output Current (max) 120mA
Heater
Heater Voltage Heater Voltage
Notes
The product of doubled transformer voltage and rectified current must not exceed 60,000 VA (same limit as AZ1). Maximum alternating anode voltage: 2 x 500 Veff under normal conditions with reduced current. German steel Y8A base — not compatible with Octal, P8A, or Rimlock bases. Widely used in German radios — found in approximately 1,394 documented radio models. Pin Layout — Y8A
1 2 3 4 5 6 7 8
1 No Connection
2 Heater
3 Anode 1 (Plate 1)
4