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

[Stevens, Bill (ES)]

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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