Hello

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Thanks for the dictionary; it was essential.

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Fortunately I made a diagram so that you could tell me that it was not the right solution.

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I now have to translate your text to make a diagram of the device. It is indeed very difficult to understand the text.

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Concerning the removal of the two 50 k? resistors. One of my references is the ARRL Hand Book 1965. Attached is an extract relating to voltage doublers (as on the L-7). Oddly enough, it is a voltage doubler (a Latour in the L-7) that provides the most constant as a function of the flow rate, provided that a bleeder resistor is used.

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The removal of the bleeder means that when the HT current is low, the peak voltage is reached. What do you think?

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Ok for the direct grounding of the 3-400Z grids.

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In the same Hand-Bokk there is the schematic of a "Compact 3-400Z grounded-grid amplifier" but with only one 3-400Z in class C. It uses a 50 kΩ resistor in series with the cathode to block the 3-400Z during reception. This resistor is short-circuited in emission. Il read :

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The 50.000-ohm resistor in the center tape of the filament transformer biases the tube to cut-off during "stand-by" periode and eliminates the "diode noise" caused by static plate current.

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F1AMM

Fran?ois