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

Sat Apr 2 21:05:27 EST 2005

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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