I have the early (6 coils) GD-1 and later (5 coils) GD-1A versions of the classic Heath dippers but prefer to use a Measurements 59 or the 59 with banana + alligator clips to grab the lower frequency Eico coils.  Frequency accuracy is pretty well guaranteed by using my Heath-Zenith SM-2420 freq counter to sniff the GDO.

Rich KB8TAD

On Sun, Apr 24, 2022 at 11:01 PM David Stinson <arc5@ix.netcom.com> wrote:
Who on this list is a fan of the classic
Heathkit Grid Dip Oscillator?


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