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For what it's worth, Drake does call it AGC on the schematic.? His statement as I read it is saying that as shipped with the 1 Meg AGC does not work properly and adding the 15K makes it work, At least that's the way I read it. It is also stated this was fixed in later T4's.

I saw this statement in another search -

The 15k AGC resistor is wired across the 1meg AGC resistor that was installed by the factory.? At least that is what Drake did in my T4X.? The 1meg was a design mistake by Drake that was fixed in later models.? A quick solution to the problem was to simply wire a 15k across the 1meg and settle for slightly less than 15k.? With a 1meg resistor there was no AGC.
Regards,
Frank Kamp, K5DKZ,? July 14, 2002

I wonder if K5DKZ is a member of this group? Perhaps he can explain it.
?
Doug, WA3DSP