• 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.

6p45c

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6P45S is only similar to EL509 and will usually work in circuits built for the EL509. Internally, it is however a very different construction. It is a frame grid beam tetrode, and actually uses frame grid construction for both G1 and G2. Compared to the EL509 it is also quite bit more massively constructed, with very thick bulb glass - it weighs a good 60% more than an EL509. It's G2 also appears to withstand higher voltages when operated as a triode, compared to the EL509.
 
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