• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

KT88 Valve Tube Amplifier Single-ended Amp DIY KIT from China. No instructions!

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6A3sUMMER

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Joined 2016
The un-equal resistors in the Dyna concertina confused me at first.

You are right, and you saw the reason that the concertina loads are equal.
The cathode of the concertina is tied through a network that goes to the input tube cathode. That provides an impedance that is in parallel with the concertina cathode resistor. The result is that the concertina cathode, and the concertina plate see equal loads.
 
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