Those are the Rubycon Black GatesJohan Potgieter said:
Some of the really famous caps and resistors are out of business anyway. They stopped production or they "upgraded" (I mean downgraded) their products like the Holcos. So if you check some reviews about "resistor sounds" keep in mind that those articles might be quite old and not up to date anymoreAnd maybe magnetic too
Not sure about it, but I think I have experienced just slightly unstable bias as a result of carelessly using magnetised screwdriver on bias pot
Only did it accidentally on one channel
The other channel where I avoided this didnt show this instability
But very small difference, and may be coincidense, I dont know
But I try to avoid it, just in case
Could there be any reality to this, or just something imaginary
Not sure about it, but I think I have experienced just slightly unstable bias as a result of carelessly using magnetised screwdriver on bias pot
Only did it accidentally on one channel
The other channel where I avoided this didnt show this instability
But very small difference, and may be coincidense, I dont know
But I try to avoid it, just in case
Could there be any reality to this, or just something imaginary
Ooops! You may NEED sharper ears!
Hi.
That explains why you can't tell triode sounds so much more musical than pentodes.
Too bad, my ears are so picky to tell me pure silver wires sound more musical than oxygen-free pure coppers. Sorry!
So tell us why many of us (excluding you, I assume) can hear resistors sound different?
c-J
PS: so many like using choke loading plate topology. Proabably they don't know the capacitance & inductance of the chokes affect the hi & lo frequency response big time. Obviously they can't hear it. So !!???
Bandersnatch said:
Hi.
That explains why you can't tell triode sounds so much more musical than pentodes.
Too bad, my ears are so picky to tell me pure silver wires sound more musical than oxygen-free pure coppers. Sorry!
So tell us why many of us (excluding you, I assume) can hear resistors sound different?
c-J
PS: so many like using choke loading plate topology. Proabably they don't know the capacitance & inductance of the chokes affect the hi & lo frequency response big time. Obviously they can't hear it. So !!???
Why?
Hi.
I quoted earlier here from the textbooks carbon composition resistors (of a brandname) of same resistance get much higher inductance with higher wattage. I would use lowest wattage possible unless it is for power handling, so as to reduce its inherent inductance, be it very low.
Do you mean we should use 10% tolerance instead of 1%
for "lesser tempco" "influence"??? Why?
That said, I always use 1% or less tolerance metal film resistors for signal paths. I measure them with 0000 digital meter to make sure closest tolerance resistors for each stereo channel. I never trust whatever resistance & tolerance marked on a resistor, whatever exotic brandname or no-name it be.
c-J
Wavebourn said:
Hi.
I quoted earlier here from the textbooks carbon composition resistors (of a brandname) of same resistance get much higher inductance with higher wattage. I would use lowest wattage possible unless it is for power handling, so as to reduce its inherent inductance, be it very low.
Do you mean we should use 10% tolerance instead of 1%
for "lesser tempco" "influence"??? Why?
That said, I always use 1% or less tolerance metal film resistors for signal paths. I measure them with 0000 digital meter to make sure closest tolerance resistors for each stereo channel. I never trust whatever resistance & tolerance marked on a resistor, whatever exotic brandname or no-name it be.
c-J
Wavebourn said:
Hi.
Like it there or not, when the design needs it there, it should be there.
Let me tell you my latest benchwork on builidng a phonostage. I finished breadboarded one & am now fine-tunig it.
Believe it or not, the original design gets a 500KR (!!!!) grid stopper in I/O signal path to receive the MC cartridge. But it is there as part of the RIAA shaping, I believe.
I tried to bypass it as it looks to me way way too large when placed in line of a phono catridge I/P signal path. That done, I can not detect any audible SPL increase after bypassing it but it offsets the tonal balance. So I have to keep that hugh girdstopper
reistance in place.
c-J
Re: What "not" "the same properties"??
On audio and even shortwave frequencies such inductances are negligible, and L-C contours they form have negligible Q due to resistive losses. For microwaves metal films are not coiled, they have thinner layers and different surface materials.
cheap-Jack said:
On audio and even shortwave frequencies such inductances are negligible, and L-C contours they form have negligible Q due to resistive losses. For microwaves metal films are not coiled, they have thinner layers and different surface materials.
All electronic devices produce noise.
Hi.
While I am awaiting yr substantiation on yr arugument, let me tell you more about electronic noises.
It's there in any electronic devices, be them resistors or vacuum tubes, & is classified as 'thermal noise' or 'shot noise'.
e (noise) is proportional to 2 time square root of its operating temperature, resistance value & the signal bandwith of the signal passing thru.
The e noise of a 1KR resistor is typically 0.6uV at room temperature (300degree K) from DC to 20KHz. Lower the resistance, lower be the thermal noise.
Another noise generated when current passed thru a resistor: contact noise which will be added or moduated onto the inherent thermal noise of the device. Generally, contact noises are generated by carbon or films, in decending order: worst- carbon compostion, carbon film, metal oxide & metal film. Wirewound resistor give least or zero contact noise.
This proabably explains why many people like the kinda 'warm' sound of carbon resistors as the contact noise generated by DC/AC current passing thru the carbon resistors modulates on the thermal noise of the resistors.
We should worry much much more the noises generated by a vacuum tube in our audo amps rather than a passive linear device, like a resistor.
The nosies generated by a vacuum tube are:
(1) Thermal noise:- 2.5/Gm of the tube;
(2) flicker noise:- 1/f noise which we should concern for audio amps handling low frequencies;
(3) partition noise: inter electrode noise generated in tetrodes & pentodes. Such noise can be 3- 5 times of a triode.
c-J
duekfx said:
Hi.
While I am awaiting yr substantiation on yr arugument, let me tell you more about electronic noises.
It's there in any electronic devices, be them resistors or vacuum tubes, & is classified as 'thermal noise' or 'shot noise'.
e (noise) is proportional to 2 time square root of its operating temperature, resistance value & the signal bandwith of the signal passing thru.
The e noise of a 1KR resistor is typically 0.6uV at room temperature (300degree K) from DC to 20KHz. Lower the resistance, lower be the thermal noise.
Another noise generated when current passed thru a resistor: contact noise which will be added or moduated onto the inherent thermal noise of the device. Generally, contact noises are generated by carbon or films, in decending order: worst- carbon compostion, carbon film, metal oxide & metal film. Wirewound resistor give least or zero contact noise.
This proabably explains why many people like the kinda 'warm' sound of carbon resistors as the contact noise generated by DC/AC current passing thru the carbon resistors modulates on the thermal noise of the resistors.
We should worry much much more the noises generated by a vacuum tube in our audo amps rather than a passive linear device, like a resistor.
The nosies generated by a vacuum tube are:
(1) Thermal noise:- 2.5/Gm of the tube;
(2) flicker noise:- 1/f noise which we should concern for audio amps handling low frequencies;
(3) partition noise: inter electrode noise generated in tetrodes & pentodes. Such noise can be 3- 5 times of a triode.
c-J
Re: All electronic devices produce noise.
There is nothing else to say. Everything has been discussed hundreds of times on these forums. You were talking about inductance, so I replied with a someone more important factor. There are so many much much more important factors than inductance. I didn't really understand your concerns. It's like bothering with chassis color when you build an amp.
cheap-Jack said:
There is nothing else to say. Everything has been discussed hundreds of times on these forums. You were talking about inductance, so I replied with a someone more important factor. There are so many much much more important factors than inductance. I didn't really understand your concerns. It's like bothering with chassis color when you build an amp.
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