[Amps] RF on audio using 374A

Jim Barber audioguy at q.com
Wed Sep 14 08:35:18 PDT 2011

Funny you bring that up, Jim.

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)


On 9/14/2011 8:25 AM, Jim Brown wrote:
> On 9/14/2011 6:19 AM, Carl wrote:
>> Glad to hear it wasnt a Pin 1 problem Roger (-;
> Ah, but it most likely WAS a Pin One Problem, and the choke to keep RF
> off the line was the easiest fix.  Think, Carl, about HOW the RF on the
> coax shield gets into the equipment!
> The way equipment is built makes Pin One Problems more likely, AND very
> difficult to fix without a complete rebuild. So the easiest solution is
> to kill the current that excites the Pin One Problem, which is what
> Roger did.
> 73, Jim K9YC
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