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  • #22awg solid wire for heaters

    Can #22awg be used for heaters on a deluxe reverb build

  • #2
    Two 6V6 = 900mA
    Six 12AX/T/7 = 1800mA

    22AWG = 920mA

    I would not use it.

    Comment


    • #3
      This table specifies 7A max for chassis wiring: https://www.powerstream.com/Wire_Size.htm
      - Own Opinions Only -

      Comment


      • #4
        Originally posted by Pedro Vecino View Post
        Two 6V6 = 900mA
        Six 12AX/T/7 = 1800mA

        22AWG = 920mA

        I would not use it.
        Where did you get 22AWG =920mA from?
        The chart says 22AWG is good for 7amps
        But it did not say what type of insulation
        The 22AWG I have is 600volt rating

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        • #5
          I found this useful size guide.
          Mainly for power electrics but shows the expected voltage drop and lengths of cable run.
          If I only had 22g wire I would feed the heavier heaters first and then a new run for the other smaller heaters. A single run has too many losses at that core size.
          Attached Files
          Support for Fender, Marshall, Mesa, VOX and many more. https://jonsnell.co.uk

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          • #6
            Originally posted by etneccas View Post
            Where did you get 22AWG =920mA from?
            The chart says 22AWG is good for 7amps
            But it did not say what type of insulation
            The 22AWG I have is 600volt rating
            From here: https://www.solar-electric.com/learn...per-wire.html/

            Honestly: I found the associated low intensity (0,92A) strange.
            On the one hand I have thought: it would be very difficult to wire a 100-watt Marshall (7A) following that criterion, and on the other: the output wires for heaters in the transformers usually have a larger gauge.

            In this other one the maximum current is differentiated: "in air" and "in jacket". I do not know what it means.
            http://www.ohmslawcalculator.com/awg-wire-chart

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            • #7
              In air means air cooled plain copper or tinned copper exposed to air. Jacketed means in a sleeve, not able to cool like plain copper can, meaning less current for a similar gauge.
              Support for Fender, Marshall, Mesa, VOX and many more. https://jonsnell.co.uk

              Comment


              • #8
                22 awg =3 amps

                Those other charts are for some special purpose, i would never run 32 amps through 14 awg yet is says 5.9 amps for power transmission?

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                • #9
                  What size wire do I need?
                  For almost everything inside any AX84 project amp to date, 22 gauge is plenty; this size wire will carry at least 7 amps in chassis wiring. Certainly this is plenty for everything besides heaters. For those, add up the heater current for the tubes you plan to use. Add in 20% to 100% for inrush current (depending on how paranoid you are). If the result is less than 7A, you're fine. Or wire some power tubes in parallel, rather than all tubes in series. See table below for other wire sizes. Larger wire sizes may not fit in your tube socket terminal holes, esp. on 7 pin and 9 pin sockets. So use the smaller of the sizes available that will carry enough current. You also care about insulation breakdown voltage (next question).
                  American Wire
                  Gauge (AWG) [1] Current
                  Capacity [2] Nearest British
                  Wire Gauge (SWG) [3] Ohms /
                  Foot [4] Ohms /
                  Meter [4]
                  18 16 amps 19 0.00651 0.01953
                  20 11 amps 21 0.01035 0.03105
                  22 7 amps 23 0.01646 0.04938
                  24 3.5 amps 25 0.02617 0.07851
                  26 2.2 amps 27 0.04162 0.12486
                  All data from 1978 ARRL Radio Amateur's Handbook or computed from data there.

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