[R-390] Limiter on R390A vs R390 (need a pot)

[Larry H]

Hi John,  I have an extra one that I'll sell you for a reasonable price.

Regards, Larry

On Sat, Jul 6, 2019 at 5:44 AM <jgedde at optonline.net> wrote:

> Thanks Larry.  I dug into it and found the problem right away.  The
> limiter pot is open from end to end and open between the wiper and the end
> at about 1/3 turn.  Now my problem is getting one to replace it considering
> the integral switch
>
>
>
> Does anyone have one in their parts bin that they’re willing to sell?
>
>
>
> Thanks,
>
> John
>
>
>
> *From:* Larry H <larry41gm at gmail.com>
> *Sent:* Saturday, July 6, 2019 7:49 AM
> *To:* jgedde at optonline.net
> *Cc:* R-390 Forum <R-390 at mailman.qth.net>
> *Subject:* Re: [R-390] Limiter on R390A vs R390
>
>
>
> John,  Your 390A definitely has a problem with the limiter.  It should
> operate smoothly to full cutoff at around 9 (depending on the signal
> strength).  My first thought would be to check c101 and c536 for leakage,
> or perhaps r119 is bad.
>
>
>
> Regards, Larry
>
>
>
> On Sat, Jul 6, 2019 at 4:39 AM <jgedde at optonline.net> wrote:
>
> Good Morning!
>
>
>
> I notice a substantial difference in how the limiter performs on my R390 vs
> my R390A.  Let me explain, the limiter on the R390 seems to be much easier
> to use as the control performs much more finely and is much easier to
> control.  The R390 cuts off completely much higher in the adjustment range
> than the R390A.  In the R390A, the limiting action is only up to about 3 or
> 4 on the dial before it cuts off completely.  Further, the R390A, is nearly
> impossible to adjust right to the point of cutoff.  After the adjustment is
> made, the action takes a second or two to settle out.  Backing off the
> adjustment does nothing for slight movement, then audio comes back
> suddenly.
>
>
>
> I suspect the R390A has an issue but I wanted to confirm that the operation
> should be the same or not before I dig into it.
>
>
>
> John
>
>
>
>
>
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