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Does the Filld Coil in this National amp act as a choke ?

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  • Does the Filld Coil in this National amp act as a choke ?

    I asked that question about another one of my old amps a while back (Supro Supreme circa 1949) and the answer was no for the below Supro amp :

    Click image for larger version

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    But for the amp below (A Valco cousin made by National), I believe the Field coil in the below National 1212 amp also serves as a power choke., is this correct ?

    Click image for larger version

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    " Things change, not always for the better. " - Leo_Gnardo

  • #2
    Originally posted by HaroldBrooks View Post
    I asked that question about another one of my old amps a while back (Supro Supreme circa 1949) and the answer was no for the below Supro amp :

    [ATTACH=CONFIG]56111[/ATTACH]



    But for the amp below (A Valco cousin made by National), I believe the Field coil in the below National 1212 amp also serves as a power choke., is this correct ?

    [ATTACH=CONFIG]56112[/ATTACH]

    In the National 1212 amp the field coil definitely serves as a PS filter choke.

    In the Supro schematic I don't see a field coil, but if there is one it is most probably also wired as filter choke.
    - Own Opinions Only -

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    • #3
      I think I've seen field coils wired from B+ to ground, in which case it does not act as a choke, but may be acting as 'ballast' to load down the supply.
      In your Supro example, I think this is the whole schematic, with the field coil shown as '1000ohm 25W'. If so, yes it is acting as a choke, not sure why it would not be deemed as so, unless there was confusion about whether it was a choke or a resistor.


      Click image for larger version

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      "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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