[Elecraft] K1 tx alignment: cannot hear sidetone or monitor tone

[Andrew Moore]

I am performing a K1 transmitter offset alignment as described on page 47 of
the manual (Rev C, October 9 2000).  According to the manual I should
install a jumper between the two "OFS" pads, disable AGC, set output to 1
watt, and enter Tune mode.  At that point I should hear two tones - a
sidetone, plus a transmit monitor tone.

I hear neither.  If I key the paddles, I hear the side tone.  But Tune mode
doesn't produce any sidetone, nor can I hear the transmit monitor tone.

Any ideas?