• 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.

Tube Phono Pre of RJM


2004-03-06 10:58 pm
RJM has this Tube phono pre on his website.


It's very nice for a tube starter like me.
Do some of you have a idea on how to improve this design?
I have already put RJM updates on the circuit in the drawing you can see underneath.


  • circuit.jpg
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analog_sa said:

I don't get it. Why pick the worst possible tube design and then improve it? With about the same effort you'd build something decent like an EAR834.

indeed, without the tube follower, this looks like a simplified version of the EAR 834. Second tube works like a current to voltage converter and delivers virtual ground (constant voltage) for first tube's anode.

Anyway, did anybody compare RJM and EAR 834 ?