Note: Please do not link down into my pages. I change this directory structure often and your links will not work correctly.
![]() |
Source ........................................ ARRL HB - 1947
Bulb .......................................... ST-12
EIA Base ...................................... 7AU
Source ........................................ ARRL HB - 1947
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.5 A
Class A Amplifier Input Triode
Source ........................................ ARRL HB - 1947
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ 0 V
Amplification Factor .......................... 72
Plate Resistance (approx) ..................... 40K Ω
Transconductance .............................. 1800 µ
Plate Current ................................. 5.0 mA
Class A Amplifier Output Triode
Source ........................................ ARRL HB - 1947
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ 0 V
Amplification Factor .......................... 72
Plate Resistance (approx) ..................... 40K Ω
Transconductance .............................. 1800 µ
Plate Current ................................. 34 mA
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 3.5 W
If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.
(c) 1994-2021 by William A. Beech, NJ7P
Thu, 30 Jun 2022 06:36:14 -0700