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Help reading the scale on my Heathkit IG-18 Signal Generator

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  • g1
    replied
    Originally posted by SoulFetish View Post
    IkHz make mathematical sense as a mid band freq., but it is NOT what you'd consider mids if you listen to it.
    I'd agree with 1K as midrange for Hi-fi or PA, but not for the guitar amp world. 440Hz is high E string fretted at 5th fret (standard pitch). So everything else is below that.

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  • SoulFetish
    replied
    Originally posted by g1 View Post
    I've been using 400Hz forever, mostly I find it much less annoying than 1K.
    it certainly is if you have to listen to it (output transformer "singing" not withstanding). IkHz make mathematical sense as a mid band freq., but it is NOT what you'd consider mids if you listen to it.
    Regardless, I still use it as a default for signal testing

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  • Leo_Gnardo
    replied
    Originally posted by Enzo View Post
    I tend to use 100Hz for the same reason. But way more than sine waves, I just use music - like from a CD player.
    100 Hz here too for larger amps. 200 Hz for smaller ones where 100 would challenge dinky output transformers. And with that in mind 500 Hz for Champs and Champ-like SE amps. All guitar amps get a guitar played thru them as a final test, bass for bass amps. This final test often reveals problems that don't show with single frequency or sweep sin wave tests.

    And yes, these lower frequencies are a lot easier on the ears.

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  • nosaj
    replied
    Originally posted by g1 View Post
    I've been using 400Hz forever, mostly I find it much less annoying than 1K.
    Juan had given me some reason to use 400hz but I don't remember what it was,

    nosaj

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  • Enzo
    replied
    I tend to use 100Hz for the same reason. But way more than sine waves, I just use music - like from a CD player.

    Leave a comment:


  • g1
    replied
    I've been using 400Hz forever, mostly I find it much less annoying than 1K.

    Leave a comment:


  • Sleet
    replied
    Originally posted by g1 View Post
    You set the amplitude control for max. voltage the range can produce. It will be a multiple of 3 or 10. Then you use the appropriate scale (3 or 10) adjusting the decimal place as required.
    So, for example, on the .3V range, you would read the top scale (3), and a '2' reading would be .2V
    Thanks, G1. I didn't read the manual carefully. Do you have a sine wave frequency that you use when trouble shooting preamps?

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  • g1
    replied
    You set the amplitude control for max. voltage the range can produce. It will be a multiple of 3 or 10. Then you use the appropriate scale (3 or 10) adjusting the decimal place as required.
    So, for example, on the .3V range, you would read the top scale (3), and a '2' reading would be .2V

    Leave a comment:


  • Help reading the scale on my Heathkit IG-18 Signal Generator

    So, I have this Heathkit signal generator that I have been meaning to use in some trouble shooting. I have the original assembly and operation manual, but can't figure out how to interpret the meter readings for setting the amplitude for my test.

    Click image for larger version

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