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Re: [Amps] RF on audio using 374A

Subject: Re: [Amps] RF on audio using 374A
From: Jim Barber <>
Date: Wed, 14 Sep 2011 09:39:03 -0700
List-post: <">>
Sure, but assuming the balanced input of the Flex/mic/cable combo 
doesn't have formal a pin one problem to start with, then shouldn't it 
be more resistant to common-mode RF than the unbalanced front-panel 
connector? I'm just looking to locate where the RF is entering the system.

And I apologize for the post-over/post-under inconsistencies. I fell 
asleep during the televised debate and so don't know who to vote for... ;-)


On 9/14/2011 9:27 AM, Jim Brown wrote:
> On 9/14/2011 8:35 AM, Jim Barber wrote:
>> Bob, if you're tracking this and happen to have a mic that will plug
>> into the balanced mic input on the 5000A, it would be interesting to
>> know if that has any effect on the issue. (assuming you're not already
>> using the balanced input)
> A balanced input is no cure for a Pin One Problem -- indeed, the entire
> concept of a Pin One Problem was first observed and identified by Neil
> Muncy, ex-W3WJE, with BALANCED inputs of pro audio gear. The Pin One
> Problem is simply a cable shield that does not go directly to the
> chassis, but instead goes to the circuit board and then, eventually, to
> the chassis.  It is what happens on those "ground" or "common" circuit
> traces that are The Pin One Problem. Neil published his work as an AES
> Paper in 1994, and was later elected a Fellow of the AES.
> 73, Jim Brown K9YC
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