I have a 7D15 Frequency Counter Plug-In that is spare to my needs and looking for a good home. It is in decent shape with one problem: it requires about 2-3 minutes to warm up and display a frequency. I went through this unit a while ago and could not seem to determine the problem. However, since I have a 7D14 that serves my purposes, I am offering this for $75 plus s&h from 92708 to someone who will make use of it and possibly who may be able to track down the problem.
Typical operation is as follows: I turn on my Tek 7704A and apply a frequency to the appropriate channel and the 7D15 displays "0.00" depending upon the settings. After about three minutes, the frequency will be displayed (accurately) and will change format as the gate time is changed -- per manual spec. Shutting the scope down or removing the unit and replacing it after a 5-10 minute wait will cause the frequency to be displayed correctly. "Cooling down" for about 20-30 minutes will require the aforementioned warm-up period.
Knobs and connectors sound and intact; interior clean; some signs of age but otherwise decent condition (save for the difficulty described). Price includes clean, like-new instruction/service manual with bright pages and no scribbling or underlining as I remember.
Pictures are below.
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