All drawings are mainly in French... But, i hope, schematic diagrams would be nevertheless understandable by others ...
Revisions takes into account some pertinent comments made by Ukrainian and Russian hams in a CQHAM.RU forum about R-140 amplifiers.
G2 screen voltage application on tube is now delayed of ~1 second after high voltage application, and HV & G2 voltages removed during operation of the motorized tuning components.
A new small circuit is added for "in tuning" & "overload", necessary when R-140 7PSZ antenna tuner is not connected to amplifier.
Nota, the +350/400/450 V circuit uses power Zener diodes available here. This is not the best technical solution, other schemes are easy to find on the web, or here.
The "S" relays used here were very common relays, and found at low cost in Dutch or German ham flea markets. New ones are now very expansive...
"Safety Chain" with relays for RF immunity.
PCB for safety chain
Amplifier by-pass relays supply calculations
Special transformer and chokes
Other supplies circuits
Rectifiers, fuses and -100 V Zener diodes.
Supply panel, G2 current detection and trip
Some pictures of the works....
For now, That's all Fox....
You can download all docs and PCB's files here: Tetrode Supply.zip
For more conventional tetrode boards, see Tetrode_Linear_Amp
Dominique - email@example.com OR