[Elecraft] KAT2 C55 null

[Chuck Teague]

I'm installing the KAT2 and am having trouble getting C55 to null (as so many
have.)  I've rewound T1, checked for solder bridges, errors in component
placement, orientation or value and every thing else I can find to try from
gleaning these archives.  The only anomaly I can find so far is that pin 7
of U4 has 4.6 volts on it rather than zero.  Pin 7 isn't used, but does the
fact that voltage appears there indicate U4 is shorted?

Voltage measurements were taken with the control board and LC board
separated, and only J8 connected to the K2.

One more question.  I will be installing the 100 watt amplifier and KAT100
in a separate enclosure for later use.  I understand that R6 on the KAT2
control board needs to be changed to 470 ohms for that operation; should I
just do that now?

Thanks to the group,

Chuck NN7U

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