"Low-noise" resistors

[WB2TBB]

Joe...
I rebuilt two Heath AA121 amps.
Yes, you can use metal film resistors in the low level stages. If you are
really concerned, there are MANY audiophile, supposedly ultra low noise
resistors (Vishay comes to mind) that you can spend lotsa bucks on.
If you dug in to your junkbox and found the oldest, moldy looking, cut from
an
old TV chassis carbon resistor, you would probably never hear a differance.
On some rebuilds, I used all new carbon-comp resistors. Some think that
the film type resistors color the sound a bit 'harsh' or 'grainy'.
I kind of doubt it.
If you are gutting in to an old Heath, I would first start with the coupling
caps.
The little yellow jobs from Antique Electronic Supply have worked very
nicely
for me.
Good Luck!....Dave
-----Original Message-----
From: Joe Filice <jpf at PHOTON.COM>
To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
Date: Sunday, February 28, 1999 10:17 PM
Subject: "Low-noise" resistors


>Hello,
>
>A couple of older Heath audio amplifiers I have use "low-noise"
>resistors at the anode and cathode of the first tube of the
>low-level (mag phono) input.  I believe these were known as
>"cracked-carbon" resistors.  Are modern metal film resistors
>suitable as replacements for these?  My ARRL Handbook describes
>metal film resistors as creating "little noise".  I was just
>wondering how they compare with the cracked-carbon resistors.
>Thanks.
>
>Joe Filice KQ6GL
>
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