[Hammarlund] SP-600 AVC issue

[Larry H]

Adam, You should also try V15, and v11 and v12.  Also check the diode
jumper on the back.  Make sure it's not shorting to ground and making good
contact on the terminals.  Also check the rf meter adjust to make sure it's
not flakey.

Regards, Larry

On Fri, Sep 24, 2021 at 12:06 AM Adam Vaughn via Hammarlund <
hammarlund at mailman.qth.net> wrote:

> Hello everyone. I picked up a SP-600 J-25C a couple of years back, and
> only recently had it re-capped. By and large it works fine, but I've
> noticed an issue with the AVC circuitry. From time to time, the incoming
> signal will overload the set, and the needle on the S-meter will repeatedly
> attempt to pin itself to the right, sometimes accompanied by the signal
> going silent and/or 'fluttering' along with the needle's movement. Turning
> down the RF gain control doesn't help; in fact, some vestiges of the
> overloaded signal can often still be heard from the speaker even with the
> control set at 0. Toggling AVC/MVC with the RF Gain set to 10 doesn't help,
> nor does changing bands or re-tuning. I have to toggle the AVC/MVC switch
> after turning down the RF gain in order to bring things back to normal, at
> least for a time. I've tried changing out V14 in favor of a NOS JAN 6AL5,
> but to no avail. Any ideas where I should look? Thanks in advance!-Adam
>
> Adam Vaughn
> Collector of old computers, video game systems, radios and other
> electronic equipment...Visit my page athttp://
> www.electronixandmore.com/adam/index.html
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