Yaesu FL-2100B input tuning coils

Discussion in 'Amateur Radio Amplifiers' started by N8CMQ, Jan 4, 2019.

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  1. N8CMQ

    N8CMQ XML Subscriber QRZ Page

    As I bought my amp used, I am not sure if I am missing parts or not.

    But the input tuning coils seem to be loose and in need of lock nuts, did the original coils have a locking nut on them? Fortunately, the small nuts used in the amp fit the coils and I am using 5 of them as lock nuts on the coils with good results.

    So if you need lock nuts, the nuts on the hardware in the amp fit well. I was adding some solder tabs and I used 6-32 hardware to replace the original metric hardware and had the metric nuts left over for the coils.
  2. G3YRO

    G3YRO Ham Member QRZ Page

    Yes, I'm pretty sure they did . . . certainly they had locking paint on them to stop them moving.

    Roger G3YRO
  3. N8CMQ

    N8CMQ XML Subscriber QRZ Page

    I didn't see any paint or lock-tite residue but the slugs looked like they had been full in and out several times.
    But with the bad caps, that does not surprise me.
    Now that I have the grids tied directly to ground, the output tuning does not swing the input SWR as much as it did originally.
    Now all I need are the Pi network caps for 80 meters to finish the amp.
    And install a dedicated 220 VAC line for the amp.
    And finish the box for the new foot switch radio/amp relay.
    And clean off the desk and make room for all the boxes.
    And get an antenna that will handle full power... ;)

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