• 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 dac

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I received a MF tubalog from a friend and was wondering if there's anything I could do with those brownish caps in the tube buffer circuit.
can anyone tell me what type of caps r these (brown epoxy coated that is shaped like a pillow)? Also, what does, say, 474J means?
help needed!
 
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