Date: Tue, 26 Oct 2010 09:47:55 -0700
From: Jim Brown <jim@audiosystemsgroup.com>
Subject: Re: [Amps] construct ferrite "line isolator"
On 10/26/2010 8:22 AM, Jim Thomson wrote:
> None of my audio rack gear has any Pin 1 problems. It has to be some pretty
> old audio rack gear to have Pin 1 problems.
Nope. Most consumer and semi-pro audio and video products, and
virtually ALL ham and computer products have pin 1 problems at every
audio input and output. The good news is that most PRO audio mfrs have
gotten the word, and do not have pin 1 problems.
73, Jim K9YC
## By 'audio rack gear' I meant semi pro and pro audio, 19" wide, rack
mount audio gear.
You can see all 14 x pieces of audio gear, split between 2 x Hammond steel
cab's, on the 1st of 4 x pix
on my qrz.com page. I use another 3 x pieces of 19" gear for the tv /
stereo upstairs. None of it has Pin 1
problems. I wouldn't buy any Pro-audio gear with Pin-1 problems. I also made
up all my own cables..using
shielded [braided] cables..and neutrik XLR connectors. There is enough room
inside a XLR connector to install
500 pf @ 25V , ceramic bypass caps. Tip to grnd..and ring to grnd...and both
ends of each cable. I matched
em all up with my LCR meter before installing. No ferrite used anywhere, Zero
RFI problems. The
XLR inputs of all the rack gear have built in RFI suppression anyway. All the
Aphex gear also has RFI
suppression on the 120 vac inputs. All the gear plugs into the same 120 vac,
rack mounted power strips,the
power strips are rack mounted to the rear of the 2 x cabinets, daisy chained
together. That power bar mess
all plugs into one big PI filter, then into the 120 vac.
Jim VE7RF
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