Hello Yves,
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after you insisted in looking the wires A8TP6 to R1 connection-2 & collector of A8-Q3 to base of A9-Q1?
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I started disconnecting A9 and the resistors from the plug-in, and unplugged A8 pcb.
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1) I checked collector of Q1 (pcb wires) to A9-pcb P1-pin-1 it was OK!
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2) I checked socket XA9-pin-1 to socket XA8-pin-21 it was OK!
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3) I checked A8-pcb P1-pin-21 to collector of A8-Q3 it was OK!
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And then I took a magnifier and a light to check the XA8 connector.........
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You will not believe what I found ... (look the photos)
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The spacer for the gap on the pcb was in the bottom of the socket between the socket pins, and A8-pcb card could not feet in the socket.
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After the reassembly I plug it in the main and put a spectrum-analyzer (I have one 9KHz to 2.9GHz),
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and the first video is for you.
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Thank you for the correction of slope in Excel, of course di/df is the correct.
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I will take more measurements in the second plug-in to find more info on its YIG.
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Yves, after that I will need your help (if you can spend me more time) to fix the frequency inaccuracy.
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For now, I'm very happy for the repair and your company to that.
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John
