Low capacitance audio coax
 

"Ian Bell" wrote in message
...
I need to send an audio signal from a 50K ohm source over a
distance of a couple of feet in a screened cable. However, most
audio coax seems to be about 100pF/ft so 2ft of this and 50K
will turn over just below 16KHz. So, anyone know a source of low
capacitance audio coax?

Cheers

Ian



Er, forgive me but how do you know it is a 50K source? I would
suggest highly unlikely. It may be that it is recommended that
the source be loaded with 50K? In fact if you are looking for
coax then perhaps you are talking about a pick-up cartridge which
will actually prefer a 47K load - but that is academic.

If you are wanting to use it with a pickup, most moving iron
cartridges - especially Shure - like to 'look' into a slightly
capactitive load or they can be excessively bright. I used to
have a Shure M75EDII which sounded much better with a total load
capacitance of 470pF - 330pF plus the typical 120pF or so of the
cables.

Check it again.



--
Woody

harrogate three at ntlworld dot com

Low capacitance audio coax
 

Woody wrote:
"Ian Bell" wrote in message
...
I need to send an audio signal from a 50K ohm source over a
distance of a couple of feet in a screened cable. However, most
audio coax seems to be about 100pF/ft so 2ft of this and 50K
will turn over just below 16KHz. So, anyone know a source of low
capacitance audio coax?

Cheers

Ian



Er, forgive me but how do you know it is a 50K source?

Because it is my own design!

Cheers

Ian


I would
suggest highly unlikely. It may be that it is recommended that
the source be loaded with 50K? In fact if you are looking for
coax then perhaps you are talking about a pick-up cartridge which
will actually prefer a 47K load - but that is academic.

If you are wanting to use it with a pickup, most moving iron
cartridges - especially Shure - like to 'look' into a slightly
capactitive load or they can be excessively bright. I used to
have a Shure M75EDII which sounded much better with a total load
capacitance of 470pF - 330pF plus the typical 120pF or so of the
cables.

Check it again.