[Elecraft] 20M sub receive

[JAY]

On 20M the Sub receive dose not work.On all other bands when I turn on the
Sub I can hear signals on VFO B. When I try on 20M it is dead.I have turned
the VFO A down so I hear nothing there and the B full volume and there is
nothing.
Where would I look  to correct this problem.

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73

KI4TXP  JAY