[R-390] R389 and R390 faults
Barry Hauser
barry at hausernet.com
Wed Mar 22 03:15:28 EST 2006
Hi Tom
Rob's primary message was a request for info on the R-389 and R-390/URR.
Mark (as he later realized, having fallen prey to the R-390/R390A confusion
syndrome) mistakenly referred him to the Y2K manual which is strictly
R-390A. I fortunately noticed how Rob had referred to the
interchangeablilty of certain modules which, although I am not intimately
familiar with the R-389, was the tip-off that he truly meant an R-390 and
the absence of the "A" was not accidental.
I was well aware that Rob was referring to his R-390A's regarding the BFO
counter knob, but it doesn't really matter. While they are probably more
often found added onto R-390A's than R-390's, they could have been added to
either receiver -- and there I was merely amplifying on Mark's explanation.
They do not have vernier/reduction built in and were probably originally
manufactured to use with 10-turn pots. As it "turns out" though, Mark's
receiver has a separate 3:1 vernier drive added behind the panel.
Now that all that is squared away ..... who's on first? heh heh
Barry
> No, if you read further down, Rob does ask about the 390A counter knob.
>
> "3. I have a couple of R390A rxs which have a mechanical counter for the
> BFO, why was this used over the standard knob?"
>
> So you gave the correct answer
>
>
> Tom
>
> On Mar 21, 2006, at 2:04 PM, Mark Huss wrote:
>
>> Opps, Caught by the R-390/R-390A confusion again!
>> About the BFO Counter knob. Your right, it is not a vernier knob. But
>> someone in the history of mine must have replaced the shaft extension
>> with a 3:1 vernier reduction gear. Very handy.
>>
>> Barry Hauser wrote:
>>
>>> Hi Mark, Rob
>>>
>>> Not sure what comes first logically, but here goes:
>>>
>>> First -- the R-390A Y2K manual on my website is the original, not
>>> revised version. If that's what you need, suggest you go to Al
>>> Tirevold's site for the later version.
>>>
>>> Second -- Rob is asking primarily about the R-389 & R-390 (without the
>>> A) -- apparently, as the '389 is related to the '390, not the A. The
>>> Y2K manual on my website and Al's is strictly for the R-390A.
>>>
>>> I am not that familiar with the R-389, but if the power supply and AF
>>> deck -- which is mostly power supply/regulation components is the same,
>>> same applies to both: The 6082's throw a lot of heat. The AF deck is
>>> mounted upside down so the heat rises and tends to cook the components
>>> under the chassis. In particular, it is recommended to replace the 47
>>> ohm resistors (4 of them I think) as per Dave Medley's advice. In
>>> addition, it's a good idea to use a small fan set up to exhaust the
>>> heat from that side of the mainframe. R-390/URR's -- the pre-cost
>>> reduced edition -- do not exhibit the same capacitor failure patterns
>>> as the R-390A/URR's. Component and tube compliment are very different.
>>>
>>> AS for the counter knob on the BFO, they are not vernier/gear reduction
>>> drives, just counters which were added to improve reset- ability of the
>>> BFO -- unless someone also added a 10-1 reduction drive as well, but
>>> it's not part of the counter-knob mechanism.
>>>
>>> hope this helps,
>>> Barry
>>>
>>>
>>>
>>> ----- Original Message ----- From: "Mark Huss"
>>> <mhuss1 at bellatlantic.net>
>>> To: "Rob Filby" <robsr390a at btopenworld.com>
>>> Cc: <R-390 at mailman.qth.net>
>>> Sent: Tuesday, March 21, 2006 2:02 PM
>>> Subject: Re: [R-390] R389 and R390 faults
>>>
>>>
>>>> First, you may want to reference the R-390A manual at http://
>>>> www.hausernet.com/r390a/
>>>> It should have everything you need. Pay particular attention to the
>>>> Capacitor replacement listing. AWlso, for some reason, 2.2K resistors
>>>> in the R-390A's seem to change value considerably. Otherwise, just
>>>> watch the list. Good Luck.
>>>>
>>>> The counter knob on the BFO was added to R-390A's used for RTTY
>>>> reception. Makes tuning the BFO to FSK tones much easier.
>>>> Rob Filby wrote:
>>>>
>>>>> Hi.
>>>>> I have recently bought an R389 and a pair of R390 rxs. They are
>>>>> all complete and in good condition.
>>>>> At first appearance it seems as the PSU, Audio stage and IF strip are
>>>>> interchangable. I have a few questions which I would to ask the group
>>>>> and perhaps somebody could help me please.
>>>>>
>>>>> 1.Were any parts listings produced for the above rxs, ie detailing
>>>>> the wattage of resistors and the voltage
>>>>> ratings of other components?
>>>>>
>>>>> 2.Are there any common faults or other troublesome components that
>>>>> fail or give trouble that I need to be
>>>>> aware of?
>>>>>
>>>>> 3. I have a couple of R390A rxs which have a mechanical counter for
>>>>> the BFO, why was this used over the standard knob?
>>>>>
>>>>> Thanks for your help
>>>>>
>>>>> Rob. _____________________________________________________________
>>>>> R-390 mailing list
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>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> More women than men believe in ghosts, while more men than women
>>>> believe in UFOs. This proves that men will believe almost anything if
>>>> it comes with really great gadgetry.-- Captain Ed --
>>>>
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>>>
>>>
>>>
>>
>>
>> --
>> More women than men believe in ghosts, while more men than women believe
>> in UFOs. This proves that men will believe almost anything if it comes
>> with really great gadgetry.-- Captain Ed --
>>
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