[R-390] Help getting unstuck! - Call for Mr. ATC

Bob Camp ham at cq.nu
Sun Apr 3 12:14:26 EDT 2005 

Hi

The 17 MHz crystal is still available from the normal crystal supply 
guys. You probably can get them at a better price from Fair though.

	Take Care!

		Bob Camp
		KB8TQ


On Apr 3, 2005, at 12:07 PM, Craig C. Heaton wrote:

> Barry,
>
> Thanks for the effort and tip. I need to add the website to my 
> favorites.
> The calibrator hopefully with a good 17MHz crystal might be necessary. 
> The
> Motorola is dead below 8MHz.
>
> Again Tnx,
>          Craig
>
> -----Original Message-----
> From: Barry Hauser [mailto:barry at hausernet.com]
> Sent: Sunday, April 03, 2005 4:55 AM
> To: Cecil Acuff; Bob Camp; Craig C. Heaton
> Cc: R-390A
> Subject: Re: [R-390] Help getting unstuck! - Call for Mr. ATC
>
>
> Hi gang ...
>
> Unfortunately -- no IF coils/transformers.  Those were harvested and 
> sold
> off a long time ago, well, before I got involved.  The IF decks have 
> all
> four filters, but no IF cans.  Most of what's there is still on the 
> ATC site
> (http://www.atc-us.com).  Click on the cascading drop-down menus to 
> look
> around.
>
> I'd suggest contacting Phil at Fair Radio.  They often sell individual 
> parts
> which they pull off parts modules as needed and which are not 
> necessarily
> listed in the catalog or website.  Further suggest waiting until you 
> have a
> replacement in hand before getting any more aggressive with that stuck 
> core.
> As someone pointed out (maybe Bob), it's broad-tuned and may well be 
> fine
> set the way it's stuck.
>
> Barry
>
>
>
>
>> Barry Hauser has all his stuff....He'd be the man to talk to....I'm 
>> sure
>> he is copying this...
>>
>> Cecil...
>> ----- Original Message -----
>> From: "Bob Camp" <ham at cq.nu>
>> To: "Craig C. Heaton" <wd8kdg at worldnet.att.net>
>> Cc: "R-390A" <r-390 at mailman.qth.net>
>> Sent: Saturday, April 02, 2005 6:33 PM
>> Subject: Re: [R-390] Help getting unstuck! - Call for Mr. ATC
>>
>>
>>> Hi
>>>
>>> I think the king of the American Trans Coil parts pile is still 
>>> lurking
>>> around here. If so he may have some IF strips for sale. I'm not sure 
>>> if
>>> they have the IF coils on them or not though. Other than that Fair 
>>> radio
>>> may be a good bet for an IF strip.
>>>
>>> Hope you can find a coil!
>>>
>>> Take Care
>>>
>>> Bob Camp
>>> KB8TQ
>>>
>>>
>>> On Apr 2, 2005, at 4:54 PM, Craig C. Heaton wrote:
>>>
>>>> Hello to All,
>>>>
>>>> The worst of the caps were the Brown Beauties! Using a Sprague 
>>>> TO-6A,
>>>> couldn't get any of these to provide a reading as to value. As far 
>>>> as
>>>> insulation resistance, most were close to nil. Some of these had
>>>> something
>>>> that looked like dried brown snot on them. Good stuff to auction as 
>>>> Rare
>>>> vintage Collins equipment on that E place.
>>>>
>>>> The Vitamin Qs were for the most part fine business, good values 
>>>> and IR.
>>>> Since I had them out for inspection, it was easy to replace these 
>>>> while
>>>> the
>>>> iron was still hot.
>>>>
>>>> C603, all three 30uF sections read about 60uF and somewhat leaky. 
>>>> C606,
>>>> both
>>>> 47uF sections read about 75uF and leaky. Not bad for 1956 vintage, 
>>>> they
>>>> served their country well. C103, a Pyramid from 1957 was a dead 
>>>> short.
>>>> Stuffed that can with a new 50uF 50Vdc electrolitic cap. Last, C551 
>>>> that
>>>> oil
>>>> bath 2uF can, it read 2.25uF and no IR. I cut that bad boy open 
>>>> with a
>>>> dremel tool and put a NTE-MLR205K630 (Mylar 2uF) inside. Never 
>>>> tested an
>>>> oil
>>>> paper cap before, maybe didn't need to replace C551, but didn't 
>>>> like the
>>>> zero insulation resistance.
>>>>
>>>> Was this Motorola a Saint Julians Creek special? I don't know, its a
>>>> Order
>>>> NO 14-PM-56-A1-51, if that adds to the conversation. All the 
>>>> sub-chassis
>>>> have the same Order NO and are Motorola.
>>>>
>>>> I've been trying a little WD-40 applied with a tooth-pick and a hair
>>>> drier
>>>> to free the slug. Gots lots of time to free that pesky critter up. 
>>>> Could
>>>> leave it alone and do the best I can with the others. But I do like 
>>>> the
>>>> idea
>>>> of a root canal. Need some spare parts before surgery!! Either a 
>>>> good
>>>> T501
>>>> or a slug will do the trick.
>>>>
>>>> Tnx,
>>>>    Craig
>>>>
>>>> -----Original Message-----
>>>> From: Cecil Acuff [mailto:chacuff at cableone.net]
>>>> Sent: Friday, April 01, 2005 2:38 PM
>>>> To: Craig C. Heaton; R-390A
>>>> Subject: Re: [R-390] Help getting unstuck!
>>>>
>>>>
>>>> Craig I don't have any magic answers on the stuck slug but I am 
>>>> curious
>>>> about the caps.  Black Beauties?  Brown Beauties?  Split, leaky or 
>>>> out
>>>> of
>>>> spec in some way?  Was it a Saint Julians Creek special?
>>>>
>>>> Others experiences are important info in this area.
>>>>
>>>> Common wisdom ranges from "Leave em alone it's not necessary" to 
>>>> "Change
>>>> em
>>>> all their evil"....and even "Only change em if they came from the 
>>>> SJC".
>>>> (not so common a wisdom I guess)
>>>>
>>>> You might try removing the can cover on the stuck slug and gently
>>>> heating
>>>> the form with a blow dryer or the slug with the tip of a soldering 
>>>> iron
>>>> then
>>>> trying to break it loose.  In another product with the same problem 
>>>> I
>>>> have
>>>> actually drilled out the center of the slug progressively....like a 
>>>> root
>>>> canal and eventually reduced it to pieces to fully remove it and
>>>> replaced it
>>>> with a similar slug....I wouldn't think it would be too critical.
>>>>
>>>> My couple pennies worth.
>>>>
>>>> Cecil...
>>>> ----- Original Message -----
>>>> From: "Craig C. Heaton" <wd8kdg at worldnet.att.net>
>>>> To: "R-390A" <r-390 at mailman.qth.net>
>>>> Sent: Friday, April 01, 2005 12:35 PM
>>>> Subject: [R-390] Help getting unstuck!
>>>>
>>>>
>>>>> Good Morning to All,
>>>>>
>>>>> Just finished putting a Motorola R-390A back together. Had to 
>>>>> replace
>>>>> many
>>>>> evil out-of-spec and leaky capacitors. The good news is no magic 
>>>>> smoke
>>>>> escaped while plugging the receiver into a source of electrons. 
>>>>> Thought
>>>>> it
>>>>> might be a good idea to realign the receiver, it was receiving 
>>>>> slightly
>>>>> before my attempts at restoration.
>>>>>
>>>>> Now the sticky question. Can't seem to get the top slug in T501 to
>>>>> move.
>>>>> All
>>>>> of the other slugs will move. This transformer has a cover with a 
>>>>> hole
>>>>> punched in the top center. Looks like a little rust between the 
>>>>> slug
>>>>> and
>>>>> coil form. I doubt I'm to first to tackle this sort of challenge.
>>>>> Anyone
>>>>> been here before? What sort of fixes for a stuck tuning slug? Of
>>>>> course,
>>>>> if
>>>>> it never moves again or I break it, does anyone have a spare?
>>>>>
>>>>> Seem to remember hearing in the Navy, "If its tight, its right". 
>>>>> This
>>>>> one
>>>>> is
>>>>> real tight, need to make it wrong.
>>>>>
>>>>> Tnx,
>>>>>    Craig
>>>>>
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>>>>
>>>>
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