Although very little information was provided, I've observed when this occurs, it is usually due to something that caused a flash-over in my amp or my tuner, such having the wrong antenna selected or other less than a stellar condition.   This includes excessive RFI in the shack, or common mode current on the feed line.    Since the bare description was "when amp on", clearly indicates a RF power related condition.

Take Jim's, K9YC, advice and be sure every piece of equipment cabinet is bonded with a dedicated ground/bonding jumper.    Also, it may be necessary to have common mode chokes at the antenna feed point.

The bottom line as I see it, it is not specifically equipment related but more so of the station installation and configuration.

73

Bob, K4TAX


On 11/11/2021 10:32 AM, elecraft-requ...@mailman.qth.net wrote:
Message: 3
Date: Wed, 10 Nov 2021 13:44:31 -0800
From: Robert Sands<k7vora...@gmail.com>
To: CUTTER DAVID via Elecraft<elecraft@mailman.qth.net>
Subject: [Elecraft] K3 3 second delay in receive after transmit keyed
        when    amp on
Message-ID:<38323c1d-d37a-4620-9f87-31b4abff3...@hxcore.ol>
Content-Type: text/plain; charset="utf-8"

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