[R-390] R-390 (NON A)

[Patrick]

Dan, I am eating crow, the leads were reversed and after going thru the 
carrier level adjustement found out that the pot was defective, have 
replaced it and all is OK now......Thanks and sorry for the noise.

Pat
----- Original Message ----- 
From: "Patrick" <brookbank at triad.rr.com>
To: "Dan Merz" <djmerz at 3-cities.com>; <r-390 at mailman.qth.net>
Sent: Thursday, June 02, 2005 11:03 AM
Subject: Re: [R-390] R-390 (NON A)


> Dan, I did reverse the leads and the meter pegs on the 0 side and never 
> moves from there. So, at least for now I think the polarity is OK. The 
> strange part is that since I have two R-390, when I tune them both to the 
> same station, both meters settle at about the same  DB level, both using 
> very similar antennas.
> So it just does not bother me to much from a operational point of view, 
> but it does from a purist perspective.
>
> If you have any other ideas, please let me know. I have the alignement 
> procedures here at home, but do not have the wiring diagrams to try to 
> make sense of this problem.
>
> Thanks ........Pat
> ----- Original Message ----- 
> ----- Original Message ----- 
> From: "Dan Merz" <djmerz at 3-cities.com>
> To: "'Patrick'" <brookbank at triad.rr.com>; <r-390 at mailman.qth.net>
> Sent: Thursday, June 02, 2005 2:41 AM
> Subject: RE: [R-390] R-390 (NON A)
>
>
>> Pat,  the thing that comes to mind is that you have the leads to the 
>> meter
>> reversed.  I looked at my meter and this would be easy to do.  I  assume 
>> if
>> you zero the meter at zero then when a signal appears it goes downscale 
>> and
>> off the scale,   and hence you have to zero it toward the high end of the
>> scale to get signal response the way you described.  My leads are color
>> coded but I don't know if the color code is universal to all 390's.  But 
>> you
>> could trace the leads with an ohmmeter back to the 6th i.f. tube/agc tube 
>> to
>> see which is which.  The minus side should go to the agc tube,  the plus
>> side to the 6th i.f. tube. Disconnect the two meter leads and pull the 
>> two
>> tubes and measure from the cathode pin of each tube to the two leads to 
>> see
>> which is which (power off on the set !!) Or just reverse the leads and 
>> see
>> if it works ok then.  Email me if you need more info on which tubes I'm
>> talking about.  Dan.
>>
>> -----Original Message-----
>> From: r-390-bounces at mailman.qth.net 
>> [mailto:r-390-bounces at mailman.qth.net]
>> On Behalf Of Patrick
>> Sent: Wednesday, June 01, 2005 3:08 PM
>> To: r-390 at mailman.qth.net
>> Subject: [R-390] R-390 (NON A)
>>
>> Have a r-390 that have just finished working on it, replaced defective 
>> PTO,
>> Crystal calibrator, checked all tubes and replaced some weak ones, then
>> aligned it. It work great, But the carrier lever meter works backwards, 
>> the
>> stronger the signal, the less the indication on the meter. Have replaced 
>> the
>> meter and there is no change.
>> Can someone put me on the right track for this problem?
>>
>> Thanks in advance for any and all suggestions,
>>
>> Pat
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>
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