I just received an Alpha 77 Dx, modified as a two-holer, as a gift (I
have very understanding friends). However, it came with a problem--it
does not work. The startup light does not come on. The previous owner
sent a board back to Alpha to fix this problem, and their paperwork
shows that they repaired it and then tested it in an Alpha 77Sx, which
is equivalent to the two-hole modified Dx, and it worked. However,
after putting the board into this rig, the problem remains. Since I am
new to this amp, and did not have it integrated into my station, I did
the following checks:
I set up the amp with no exciter, but with power, and the fan comes on
and the voltage goes to about 2600 volts. I followed the regular startup
procedure and, sure enough, the light does not come on after six minutes
(it is supposed to take about 3minutes). I then put a cable into the
relay jack on the back, repeated the above process, went ahead and put
the amp into CW/low power mode after a six-minute wait, and then shorted
the relay cable. I did not hear a relay click--nothing happened.
Can someone help me to isolate the problem with this amp? Until this
happened, the previous owner (the donor of the amp) was using it without
a problem. There was no cataclysmic event that preceded the failure to
start up.
I can imagine problems like bad contacts on the board connector, or
perhaps the failure of another relay somewhere.
Thank you,
Jan, KX2A
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