[R-390] R-390 Woes

[Francesco Ledda]

👍
Sent from my iPhone

> On Oct 7, 2025, at 23:20, Jim Whartenby via R-390 <r-390 at mailman.qth.net> wrote:
> 
> For the life of me, I don't understand why people grease the R-390 geartrain.  The manual even says that it is better to not grease then to over grease.  The group that knows the most about gear works, in general, are the clock collectors.  Their advise is to sparingly oil pivot points and do nothing to the gear teeth.  It will only collect dust and gum up the works, if you do.  As for the R-390 or is it an R-390A?  First, test all tubes, IRAN, second reseat all connectors, then test again.
> Regards,
> Jim
> 
> Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy
> 
>    On Tuesday, October 7, 2025 at 03:56:50 PM CDT, Adam Morehouse <morehouse90 at gmail.com> wrote:   
> 
> Hey guys,
> 
> I appreciate the pointers on my R-392, and now that it's buttoned up, it's
> time to work on my R-390. I only tested this briefly when I first got it,
> today I threw it up on the bench. Supposedly this was restored by Rick
> Mish, it is very clean (except the gear train, which has a lot of fresh
> grease...), and the front panel is pristine.
> 
> It does pull stations, but the volume is extremely low in AGC mode, and
> gets slightly louder when placed into MGC.
> 
> In MGC, with the BFO switched on, it plays at a normal (not super loud, but
> loud) volume.
> In AGC, with the BFO switched on, it hums, low volume audio.
> 
> The limiter seems to have no effect, and varying the BFO doesn't do
> anything at all no matter AGC/MGC.
> 
> I have Tom's solid state kit installed, and B+ at the AF deck test point is
> a steady 180.5vdc.
> 
> I am going to dig out the TM's later on, I have them somewhere...but maybe
> somebody here can help point me in the right direction.
> 
> Thanks!
> 
> Adam K2AAM
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