• 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.

EL84 driver tube, with less than 5mA current

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Bandersnatch

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Joined 2003
Shoog said:
The original Tubecad article suggests that Partial feedback amps can deliver lower output impedance when run in Pentode mode. I personally read that as meaning that Pentode mode has the potential to sound better than triode mode in these designs.

Shoog
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I'll have to agree on that one. One gets the pentode benefits while delivering FB to lower the effective output Z of the pentode itself( rather than including other gain elements in a loop). I have had some very nice amps built like this, which happened to also employ U-L to further lower the gain element output Z.
cheers,
Douglas
 
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