[Hallicrafters] My First Boat Anchor Restoration: SX101 MkIII

Wed Nov 16 12:51:23 EST 2011

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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