[TenTec] Argonaut 509 Bias Mod

[Byron Tatum]

Hello-
    I installed the bias modification under "Improving SSB Performance of Argonaut 509". I had problems - the PA current was way too high and could not be adjusted down.
    Did a lot of checking and found nothing wrong on PA board. The problem was due to the ground wire that goes from PA board socket to adjacent ground lug. There is one on each end of socket. The one (at end of board where bias circuit was at)  had come loose from the chassis solder lug, it was not readily seen due to wire covering up solder lug. It appeared it was not securely soldered to begin with. The wire had a hook shape to it, and was centered around lug and not touching it (??). 
    All is well now and the PA bias did adjust correctly after correcting problem.
    Anyway, just a tidbit of info that may help someone else.
    Speaking of Argo 509 - Does anyone have an AGC revision or update that may help the "pop" on strong stations?
                                                                        Thanks, Byron WA5THJ