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    B+ current

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    tubesman

    Posts : 3
    Join date : 2010-10-14

    B+ current Empty B+ current

    Post by tubesman on Wed Nov 27, 2019 4:23 pm

    I am rebuilding a st-70 and I'd like to know what is the current pulled on the B+ rail? Using EL34 tubes biased normally.confused  At what voltage, using a stock PA-060 transformer? Thanks in advance for the help. Smile
    peterh
    peterh

    Posts : 1228
    Join date : 2012-12-25
    Location : gothenburg, sweden

    B+ current Empty Re: B+ current

    Post by peterh on Wed Nov 27, 2019 4:37 pm

    tubesman wrote:I am rebuilding a st-70 and I'd like to know what is the current pulled on the B+ rail? Using EL34 tubes biased normally.:confused:  At what voltage, using a stock PA-060 transformer? Thanks in advance for the help. :)
    Using dynaco's own documentation; page 6 mentions that bias is adjusted to
    100mA per pair, that's 200mA, then a guess that each 7199 will eat 10mA , in total 220 mA

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    tubesman

    Posts : 3
    Join date : 2010-10-14

    B+ current Empty Re: B+ current

    Post by tubesman on Thu Nov 28, 2019 12:44 am

    Using dynaco's own documentation; page 6 mentions that bias is adjusted to
    100mA per pair, that's 200mA, then a guess that each 7199 will eat 10mA , in total 220 mA

    [/quote]
    That sounds like the current that the tubes are biased at. I'd like to know the full power current drain at rated output. Sorry I didn't make that more clear.  I am using PSDII. I made measurements on the transformer to estimate, as closely as possible, the PS output voltage at full load. I need to squeeze as much voltage as possible out of the PS to handle my driver stage, not a 7199. BTW, thank you for your reply.

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