[Hallicrafters] My First Boat Anchor Restoration: SX101 MkIII

Wed Nov 16 12:57:36 EST 2011

The last word should be mica.

Some of the old component identification guides that "decode" the markings
for the 6 dot capacitors say that if the first dot is black, it's mica. If the 
dot is
white, it's paper.

On 11/16/2011 12:51 PM, Roger D Johnson wrote:
> Mica caps don't contain oil. Probably some of the old paper caps
> that look like mics.
>
> 73, Roger
>
>
> On 11/16/2011 12:18 PM, bonddaleena at aol.com wrote:
>>
>> On the URM-25D, you will probably find that the mica caps in the unit are cracked and leaking oil. Mine were. I replaced all the 'leaking' (both electrical and physically!!) caps and checked the tubes.
>>
>>
>>
>> Cap testing and replacement is another discussion that can pretty opinionated. ha ha
>>
>> ron
>> N4UE
>>
>>
>>
>> -----Original Message-----
>> From: Jason Hissong<jhissong at gmail.com>
>> To: rbethman<rbethman at comcast.net>
>> Cc: hallicrafters<hallicrafters at mailman.qth.net>
>> Sent: Wed, Nov 16, 2011 10:31 am
>> Subject: Re: [Hallicrafters] My First Boat Anchor Restoration: SX101 MkIII
>>
>>
>> I won the auction for the 25D on EBay.  I paid $116.00 for it.  I know
>> hat what I will be getting *may* not work and will need some
>> estoration.  I have several hams here locally that can assist me with
>> his with and  they have the appropriate gear to get it
>> alibrated/restored.  I also have a ham that is willing to loan me an
>> FR 1000S for my use (and as he said, maybe a deal I cannot refuse to
>> urchase it later).
>> This weekend, I plan on testing each of the tubes in the SX101 in the
>> ube tester (on loan to me).
>> Thanks for all the assistance and advice everyone.  I have learned a
>> reat deal just by talking with some of you on the list and directly
>> hrough email.  And thanks for the receiver info resources presented
>> n this thread.  I do understand how receivers work conceptually, but
>> ow it is time to dive deeper.
>> 73,
>> ason N8XE
>> On 11/16/11, rbethman<rbethman at comcast.net>   wrote:
>>    I agree with your assessment of the GR-1001A, and the good results with
>>    the AN/URM-25(X).
>>
>>    I ended up with a HP-606B for the price of come and get it.  I also
>>    obtained an HP-312A from the same source and price.
>>
>>    I only wish it WAS an HP-606A.
>>
>>    I was given mt AN/URM-25 by a brother Warrior/Ham.
>>
>>    I only had to replace one tube.  I've calibrated it against WWV and
>>    several crystal calibrators.
>>
>>    I gave Jason one piece of advice regarding one that he was looking at on
>>    Ebay.  When you read the ENTIRE description, it reads the ubiquitous
>>    "As-Is" thing.
>>
>>    That always makes me VERY nervous!
>>
>>    They are however, very adequate for the job he's looking at.
>>
>>    He has to decide how much use this test equipment will get used.  That
>>    has a BIG impact on how much someone wants to put in it.
>>
>>    Carl, you and I probably use this stuff MORE than the masses.  This
>>    could be a one=time thing for Jason, OR very infrequent.
>>
>>    His call!  (Along with whatever his Elmer's have available!)
>>
>>    Bob - N0DGN
>>
>>
>>
>>    On 11/16/2011 8:45 AM, Carl wrote:
>>> The URM-25D hung from one of my hands for about 3 years as a USN ET and it
>>> did an excellent job keeping our country safe.
>>>
>>> National had the GR 1001A's and they drifted so bad we used discrete
>>> crystal
>>> oscillators to do calibration. The only thing they were good for was IF
>>> and
>>> filter alignment along with general tracking and spot sensitivity tests.
>>> The
>>> coax adaptors can get pretty pricey also and signal leakage can be a
>>> problem
>>> when doing sensitivity measurements on the better receivers.
>>>
>>> With the NCX-3/NCX-5 and HRO-500 they were useless.
>>>
>>> The HP-606A replaced them and it is still one of the best generators even
>>> today. I have a pair of them and save the fragile 8640B for other work.
>>>
>>> Before getting the 606A's I rebuilt a URM-25D and used that for many
>>> years.
>>> They drift a bit but certainly not as bad as the GR.
>>>
>>> A good 25D will run $50-100 unrestored and around $40-75 for a 606A from
>>> what Ive seen at New England hamfests and several forums. Ebay is usually
>>> much higher.
>>>
>>> Carl
>>> KM1H
>>>
>>>
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