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Harbach Soft Start & SB-220/221

Discussion in 'Amateur Radio Amplifiers' started by WA4OHZ, Jun 13, 2021.

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  1. WA4OHZ

    WA4OHZ Ham Member QRZ Page

    Any one have a(ny) picture(s) of their installed Harbach Soft Start installed in their SB-220? I'm trying to figure out how to mount the board. I'm debating on using some 1/2 nylon standoff insulators and maybe hot gluing the
    standoffs to the bottom of the chassis, etc.

    TIA, 73's
    John WA4OHZ
  2. WA8ZYT

    WA8ZYT Ham Member QRZ Page

    I don't think a soft start is necessary on an SB220.
    N4ZAW likes this.
  3. KD9IQO

    KD9IQO Ham Member QRZ Page

    I must agree with WA8ZYT. I installed the Harbach unit and it was most ineffective. So, I built a robust outboard unit that would be effective with any legal-limit amplifier containing a sane amount of filter capacitance. See my document.

    Attached Files:

    N3RYB likes this.
  4. N8VIL

    N8VIL Ham Member QRZ Page

    Here are a few pictures of how mounted mine during a rebuild of my amplifier. In retrospect I don't think it was necessary as others have stated.

    soft.jpg soft1.jpg soft2.jpg

    Attached Files:

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