[Hallicrafters] EXT :Re: SX-100 (and SX-96) microphonics

[Carl]

I meant to say solder the wipers to the capacitor frame.

Carl
KM1H


----- Original Message ----- 
From: "Stevens, Bill (ES)" <william.stevens at ngc.com>
To: "Carl" <km1h at jeremy.mv.com>; "Chris Kepus" <ckepus at comcast.net>; 
"'MikeEverette'" <radiocompass at yahoo.com>; <hallicrafters at mailman.qth.net>; 
"'ka9p'" <ka9p at aol.com>
Sent: Monday, November 21, 2011 2:04 PM
Subject: Re: [Hallicrafters] EXT :Re: SX-100 (and SX-96) microphonics


> Clean the crud (dirt and grit) out of the bearing races on the main and BS 
> caps, use alcohol or acetone then repack using moly grease..
>
> -----Original Message-----
> From: hallicrafters-bounces at mailman.qth.net 
> [mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of Carl
> Sent: Monday, November 21, 2011 1:57 PM
> To: Chris Kepus; 'Mike Everette'; hallicrafters at mailman.qth.net; 'ka9p'
> Subject: EXT :Re: [Hallicrafters] SX-100 (and SX-96) microphonics
>
> I own a late SX-100 MK2A and have rebuilt dozens but havent experienced 
> any
> microphonics outside of a bad tube or bad ground connection under the
> chassis.
>
> They all have a somewhat flimsy chassis which results in poor mechanical
> stability. Soldering the spring brass variable cap wipers to the chassis
> helps...as it does in many sets of all brands...but its not a complete 
> cure.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- 
> From: "Chris Kepus" <ckepus at comcast.net>
> To: "'Mike Everette'" <radiocompass at yahoo.com>;
> <hallicrafters at mailman.qth.net>; "'ka9p'" <ka9p at aol.com>
> Sent: Sunday, November 20, 2011 6:51 PM
> Subject: [Hallicrafters] SX-100 (and SX-96) microphonics
>
>
>>I suppose broaching this subject is like beating the 1000th dead horse!!!
>> (apologies to PETA).
>>
>> But,...  since I have a nice SX-100 that mostly goes unused except as a
>> remotely mounted monitor because of them dang Microphonics thingies, I
>> have
>> to ask, does anyone have a SX-100 that's not microphonic?  If the answer
>> is
>> yes, please share whatever you did to cure it.
>>
>> What's a bit odd to me is that my S-76, which is one of favs, is not
>> microphonic.  Is it, a the song suggests, just "physical"?
>>
>> Listening mode back on.
>>
>> 73 and tnx,
>> Chris
>> W7JPG
>>
>>>From Mike's message..............
>> "The biggest issue I recall with the SX-96 (which I used as a nain
>> receiver
>> for years) is microphonics, especially on 15 and 10 meters.  If someone
>> knocked on the front door at my house, it could be heard in the speaker.
>> The next biggest was that if my foot hit the table, the receiver was
>> likely
>> to lose the frequency of the signal.
>>
>> You learned breath control when using one.  That skill comes in handy if
>> you're a swimmer, or a singer."  YES!!!! LOL!!!
>>
>>
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>
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