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Which fuse to use...???

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  • Which fuse to use...???

    What mains fuse rating should I use with a power transformer having the following specs:

    Secondary: 300-0-300 V, 150 mA
    Filament winding 1: 5 V, 3 A CT
    Filament winding 2: 6.3 V, 5 A CT

    Thanks for your help

  • #2
    Originally posted by acorkos View Post
    What mains fuse rating should I use with a power transformer having the following specs:

    Secondary: 300-0-300 V, 150 mA
    Filament winding 1: 5 V, 3 A CT
    Filament winding 2: 6.3 V, 5 A CT
    300v x 150ma = 45va
    6.3v x 5a = 31.5va
    5v x 3a = 15va
    91.5 va altogether

    91.5va / 110v = 0.83a

    Match to 1A and multiply by two = 2A mains fuse



    or if you are on a 240VAC mains

    (91.5va/240V = 0.38a) x 2 ~ 1A mains fuse

    That PT is ideal for a 5G9 BTW. What were you planning to build?
    Building a better world (one tube amp at a time)

    "I have never had to invoke a formula to fight oscillation in a guitar amp."- Enzo

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    • #3
      Originally posted by tubeswell View Post
      That PT is ideal for a 5G9 BTW. What were you planning to build?
      5D4

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