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AC filaments if directly heated use a centertap on the transformer to complete the cathode circuit. They have extremely tiny amounts of hum.
I've heard DC will wear out a filament quicker due to more emission on one side of the filament. Not sure though.
Standard practice on most tubes is...
40 meter AM? Biggest problem will be ssb stations thinking you are a shortwave broadcaster. They usually zero beat them in order to use the frequency. Without a buffer you will have some phase modulation and an "interesting" beat note to say the least.
Pipe it through a big amp : )
Caps were necessary years ago. They were not there for rf bypassing.
Resistors and caps across diodes will not buy anything you need unless you desire to use ancient diodes. Just put plenty in series for more PIV.
Many textbooks show different rectifier configurations and their requirement...
Maybe I should have written it differently.
DC grounding does not make antennas have sharp points.
The combination of DC grounding AND sharp points on antennas is known to drain pre-strike charges.
Antennas which are DC grounded and have multiple sharp metal pieces are proven to dissipate pre strike charges.
Less chance of getting hit in the first place.
What happens during a strike is a different matter. Low inductance bonding of all equipment and grounds is the name of the game there.
There are hundreds of unavailable issued calls out there from those who passed away more than 2 years ago.
Callsign renewal lasts 10 years now.
Lots are not available yet because nobody goes around policing the call database.
There are cases where people find out someone has died and...
SWR is the ratio of minimum to maximum voltage or current on a transmission line. Nothing more nothing less.
This can be measured fairly easily at audio frequencies as the measurement device will not influence the circuit.
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