[R-390] R389 and R390 faults

Fri Mar 24 12:16:07 EST 2006

Would anyone know if there are vernier Knobs available for
the BFO on the R-390A, and at what price ?
john kopke
----- Original Message ----- 
From: "Tom Norris" <r390a at bellsouth.net>
To: <r-390 at mailman.qth.net>
Sent: Tuesday, March 21, 2006 8:49 PM
Subject: Re: [R-390] R389 and R390 faults


> 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
>>>>> Home: http://mailman.qth.net/mailman/listinfo/r-390
>>>>> Help: http://mailman.qth.net/faq.htm
>>>>> Post: mailto:R-390 at mailman.qth.net
>>>>> Unsubscribe: http://mailman.qth.net/mailman/options/r-390
>>>>>
>>>>>
>>>>
>>>>
>>>> -- 
>>>> 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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