My K3, Ser. No 308, does NOT have the HAGC mod. So the SN 211 guestimate
appears pretty far off.
Phil - AD5X
"Correct...units prior to ~211 will need it and afterwards will not. If
yours is near 211 (+/-), you may need to check the capacitance of C222 using
a capacitance meter. It should read ~0.1 uF (or ~100 pF) if the mod has
been installed (if not it will read ~1 uF).
I'm guessing on this, and hopefully Eric or Wayne should confirm, but I
would expect that both the HAGC and keying mods were implemented in
production at the same time, since the S/N transition is the same for both
(i.e. ~211). If this is true, you can easily determine if your unit was
modified by looking for a discrete 1.8k resistor installed between C196 and
C197 as shown in the HAGC mod instructions. If that resistor is in place,
it's a good bet that C222 has been replaced as well, but a capacitance meter
will tell for sure. 73, Bill W4ZV"
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