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carlsbro 50 top /biasprobe

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  • carlsbro 50 top /biasprobe

    Hi.
    I´m a little puzzled. I do have a diy biasprobe that works without errors. But when I´m testing tubes on my 50 top, I get readings like 73 ma (reading is mv) Is this due to construction off the 50 top (measuring both tubes at one time) or is it running ekstremely hot? It has a fixed bias, with a 4k7 resistor, which I´m planning to change for a 10k trimpot.
    Any help will be apreciated
    Thanks
    Per
    Click image for larger version

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