[Patrick Turner]

Ian Bell wrote:

snip,


If you are worried by magnetically induced noise in WW R, then use a
pair of equal value and same brand with one reverse connected and close
to the other. Thus the magnetic noise of one cancels that in the other.


Interesting idea. Unfortunately it means finding WW resistors of double
the value and it's hard enough finding ones of the original value.

The circuit working should not be that critical.

You may have 4 x 5W stacked together, with short leads, correctly phased
to minimise hum....

Using 5 x 220k parallelled metal films each of 1/2 a watt gives you 44k,
5W, and maybe excess noise is lower,
but Johnson is the same as a 44k single R.....

Patrick Turner.