Diode Valve / Tube operation theory formulas » Electronics Notes
Diode - Wikipedia
Vacuum diode
Power Vacuum Tubes
Valves - A Primer
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From left to right: structure of an indirectly heated diode, symbol... | Download Scientific Diagram
DIRECTLY HEATED
Vacuum diode
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35PCs 6X6S 6X6C 6X6 Indirectly heated double diode with oxide cathode, very rare | eBay
Valve Technology - A Practical Guide
From left to right: structure of an indirectly heated diode, symbol... | Download Scientific Diagram
Vacuum Tube Diode
The Thermionic Diode - Verulam Amateur Radio Club : Verulam Amateur Radio Club
From left to right: structure of an indirectly heated diode, symbol... | Download Scientific Diagram
Tubes
DHTRob - Indirectly- versus directly-heated rectifiers
File:Symbol valve diode indirectly heated.png - Wikimedia Commons
Types of Diodes and Their Applications - 24 Types of Diodes | Diodes, Electrical projects, Diode
