TUBEOFILE
Search
Compare
FAQ
Tube+
Sign In
Sign In
☰
Loading...
EF800 — Small Signal Pentode, Noval | Tubeofile
← Browse
EF800
Small Signal Pentode — Noval
···
+ Compare
Telefunken
Data: Medium
Medium quality — at least 60% of universal parameters and pins are present, but some key data is missing. Verify specific values against datasheets before critical use.
↗ TDSL
↗ Radiomuseum
Known Equivalents & Substitutes
CV5092
Similar Tubes (Not Drop-In Compatible)
EF80
Consumer version with similar characteristics but standard service life
EF860
Nearly replaceable Telefunken long-life pentode with slightly different characteristics
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
300
V
Screen Voltage (max)
Screen Voltage (max)
200
V
Anode Dissipation (max)
Anode Dissipation (max)
2.5
W
Typical Operating
Anode Voltage (typical)
Anode Voltage (typical)
250
V
Notes
Part of Telefunken's special 800-series with extended service life for commercial and professional applications.
Developed in 1952 for postal and broadcasting organisations requiring long-term reliability.
Not a direct substitute for EF80 despite similar parameters — the EF800 has tighter tolerances and different screening.
Pin Layout — Noval
1
2
3
4
5
6
7
8
9
1
Internal Connection
2
Control Grid (g1)
3
Cathode
References
https://frank.pocnet.net/sheets/128/e/EF800.pdf
Screen Voltage (typical)
Screen Voltage (typical)
140
V
Grid 1 Bias Voltage
Grid 1 Bias Voltage
-2
V
Anode Current
Anode Current
10
mA
Transconductance
Transconductance
7.4
mA/V
Heater
Heater Voltage
Heater Voltage
6.3
V
Heater Current
Heater Current
0.275
A
4
Heater
5
Heater
6
Screen Grid (g2)
7
Anode (Plate)
8
Internal Connection
9
Suppressor Grid (g3)