[R-390] Audio resistors?

[James Miller]

The oxygen free cable, gold plated connector crowd is the victim of a
continuing scam that never ceases to amaze me.  Like the cell phone
range extenders, instant fat reducers, electro-shock muscle exercisors,
and no-oil engine lubes.  Assuming no damage to the inactive components
of a circuit, the majority of noise is generated in the tubes or other
active devices themselves. If you really want to reduce noise, save your
money on the monster cables, and go solid state and add cryogenic
cooling.  The lower the temperature, the lower the noise.  Same
principle as is used for cryogenic cooled low noise amplifiers in
satellite equipment.  

blw wrote:
> 
> Joe,
> 
> Those audiophile guys don't have boatanchors, so they get into this stuff. I
> guess if I had a bunch of Mullards, Golden Dragons, etc I would be
> interested in picking the brands with the best specs on noise, etc. It is
> sort of like picking the right combination of mixer tubes until you get the
> best gain and least noise. Same thing to me but I'm not that into tube
> design, manufacturing tolerances, specs, etc like the audio crowd. The thing
> I am against are the prlces those guys jack up on tubes.
> 
> The reason I'm wondering about resistors for audio is that I had to replace
> one of 8 resistors coming off of the power tubes in my amplifier. There are
> 8 of them going from the tube to the transformer, so I'll replace all of
> them. The only 2 watt ones I found in the Mouser catalog were carbon types.
> I replaced the burned one but haven't done the other 7 yet. I'll go back and
> check all of the resistors and do them all at one time.
> 
> There is hiss in the amp without any audio from the radios. I'm interested
> in reducing it if I can, but I'm not going to obsessed with the project.
> Less hiss means less noise with the R-390A and SP added when trying to dig
> out the weak signals. It's not all that much hiss, but it does contribute to
> the total noise factor. Increasing treble also increases hiss. It is
> noticable with headphones.
> 
> I have a JPS NIR-12 for noise and static, but I prefer bypassing that when I
> can for the all tube audio. The NIR-12 is a champ for bad conditions or as a
> last resort for digging out a station, but it isn't hollow state gear.
> 
> Barry
> 
> > I read some off the threads here and find them funny.
> > Audiophiles guys are the worst !
> > One guy around here pays $300 for "Golden Dragon" (Sino Chinese) 12AX7 for
> > his tube mic's,
> > I can get them bulk boxed without the fancy silk-screening and screening for
> > $60 a dozen but usually have to throw away half
> > My main gig is working on guitar amps that have many stages of soaring gain.
> > Go with regular carbon and double the MFD use polypro orange drops for the
> > coupling.
> > If you want to get into it you can look for a strong Mullard "pull" 12AU7
> > with matching triodes.
> > That "WILL" sound great audio especially in the non A.
> > If you one of the guys with SS diodes and 200 ohm resistor replacing the
> > 26Z5:
> > Cranking the audio loud with a strong 12A*7's in the audio section the set's
> > PTO may frequency modulate to the audio.
> > Use a Variac and no resistor with diodes
> > jOE
> >
> 
> >> What are the quietest or best resistors for pure audio use? I need to
> >> replace some in an amplifier and also in an AF deck that has problems. I
> > may
> >> as well do the problem resistors while in there recapping it.
> >>
> >>
> >> Barry
> 
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