6sX7: that's right, the voltage will change when the resistor value does. Your options are to 1) use the current V as a guide and order a set of quality resistors that produce around a 4.5 mA value or 2) buy a set of resistors with multiple values in the 450-700 range (could not find one on Amazon but 6L6 has recommended one above).
I elected for the first choice so I could order .1% resistors and get the same value on each board. Values of 620 and 640 ohms would bring your two boards to the same mA value and stay within range around 4.5ma. Again, there is some question as to whether matching this has any value.
I elected for the first choice so I could order .1% resistors and get the same value on each board. Values of 620 and 640 ohms would bring your two boards to the same mA value and stay within range around 4.5ma. Again, there is some question as to whether matching this has any value.
I tried using Sorbothane pucks under my Linn LP12.... it KILLED the sound.... absolutely destroyed it. The best way I can describe it, it sucked the life out of the music. It made it boring... I guess it just stole all the harmonics, whatever...
I also tried to use a Sorbothane puck as a record clamp.... it also KILLED the sound.
So, I dunno about your VPI, but not all devices like to be isolated. For example, my Audio Note speakers are tuned to resonate...
Both the LP12 and the AN speakers are on Target stands. The stands are lead/sand filled and down spiked to the floor. The rack shelf for the TT is levelled and on up spikes. British components on British stands... They seem to work very well together.
BTW, there is a "better" grade of isolators. They use a man made material instead of cork. They call them "EVA Extreme Anti Vibration"
https://www.supplyhouse.com/Pads-11752000
I also tried to use a Sorbothane puck as a record clamp.... it also KILLED the sound.
So, I dunno about your VPI, but not all devices like to be isolated. For example, my Audio Note speakers are tuned to resonate...
Both the LP12 and the AN speakers are on Target stands. The stands are lead/sand filled and down spiked to the floor. The rack shelf for the TT is levelled and on up spikes. British components on British stands... They seem to work very well together.
BTW, there is a "better" grade of isolators. They use a man made material instead of cork. They call them "EVA Extreme Anti Vibration"
https://www.supplyhouse.com/Pads-11752000
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The VPI does like to be isolated and is designed on the principle of heavy weight (=platter) rotating independently of the motor and tone arm. With the Supply House isolators the sound is precise indeed.
Not surprised at your description of the Sorbothane pucks. Their shape makes them unusable for my audio needs.
Good quote for the EVA vibration pads; thanks.
This still might be on the low side.
I tried that annoying fact on my first build. As you increase the value of R27, the voltage also rises slightly.
All my 3 builds ended up with 680 ohm to keep the measured current under 5mA.
Using LME49720 TO-99 metal can, at 4.8mA it gets pretty hot. Yes.... if tough, you can keep your finger rested on it,
but you are in no way in doubt about the temp. 😉
Exactly.
The problem with the VPI´s (and several others) motor pod is, that it/they vibrate. Depending on platform material, the vibration paht
is down to the platform, raised to and through the plinth (on the same platform), through the bearing to the platter, and then picked
up by the cartridge and mistaken for "hum".
The most reduction in, what I previously perceived as "groove noise", was when I replaced my (8,6Kg) alu-platter with a similar size/weight
platter with a Maglev bearing. The last few percents were eliminated when the motorpod was isolated from the platform.
"Vinyl/groove-noise" on good pressings is now none existing.
At the same time this opened my ears to, what a marvellous little gem the Pearl-3 is.
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The quieter the turntable the more you note the extreme dynamic power TonyEE has ascribed to the P3.
I am using sorbotane hemispheres under my TT, they work well to suppress the vibration from the table to the pickup and, while I don't go banging on my system cabinet, I like to have that eventuality covered.
I hear nothing of the kind you are reporting. I have no idea how adding vibration insulation would 'suck the life out of the music'.
I like the puck to be heavy and rigid so that the record becomes one with the platter, for better or worse. So that point makes a little more sense.
'British components on British stands...' we are going off the deep end here..
I would not consider cork to be a great vibration insulator. Still all this stuff can be measured to at least clarify all these reports. I have seen such measurements done in the past.
Great question and haven't been able to find out. No info on the set which is impressively printed. Have these Asylum records also in original pressings including one NOS. These have the light background hiss from tape masters. The lack of this hiss in the new set makes me think they are digitally remastered -- but in a very good way.
They are very worth hearing...make the effort.
They are very worth hearing...make the effort.
I am using sorbotane hemispheres under my TT, they work well to suppress the vibration from the table to the pickup and, while I don't go banging on my system cabinet, I like to have that eventuality covered.
I hear nothing of the kind you are reporting. I have no idea how adding vibration insulation would 'suck the life out of the music'.
I like the puck to be heavy and rigid so that the record becomes one with the platter, for better or worse. So that point makes a little more sense.
'British components on British stands...' we are going off the deep end here..
I would not consider cork to be a great vibration insulator. Still all this stuff can be measured to at least clarify all these reports. I have seen such measurements done in the past.
I have Linn LP12 on Trampolin 2 feet. On a Target TT5 lead filled stand which satisfies the "light but rigid" recommendation from the factory. I've tried other heavy stands and the isolation feet and they rob the music of its liveliness.
The puck on the record also robbed the music.
Again, it's all on the type of turntable you got. I go strictly by my ears.. does it sound like real music? If so, I like it. My Linn LP12 did not like it.
I don't measure, I listen. But I will venture this... a tuned suspension designed to operate on a mechanical diode that disposes of vibration energy away from the device will not work on something that absorbs it. The springs, Trampolin feet, shelf on pins, hard-rigid-high frequency resonating stand, spiked feet into metal cups on the concrete slab. etc... transmits high frequency vibrations away from the table.
The Sorbothane cups just absorbe and dissipate it. And I can hear that difference in behavior.
Likely a suspension less TT will work much differently in handling vibrational energy.
What do you have? A VPI? Sota? TNT? All of those are the High Mass designs...
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True. I've been spending the last 20 years focused on lowering the background noise of the system.
Last year a Karousel bearing was installed in the LP12 and that lowered the noise incredibly. INCREDIBLY...
The other day I was listening to the MoFi 45rpm version of Dire Straits Brothers In Arms... on the lead out groove, with the preamp still set for a rather high volume, standing just two feet from the Maggies I could barely hear the stylus sound.
From 12 feet away the LP was stupendously quiet. Mind you, two of us were listening. the other fellow is into building speakers and he told me he heard some speaker overdriving... it was LOUD. The loudest I've had the speakers because I just hooked them up to the bridged F4s... the peaks were LOUD. Yet you couldn't hear the background noise. And low level voices, instruments were clear...
Later by myself I played other stuff at much lower levels and I could still clearly hear the low passages without the noise overwhelming it. I ought to note that this is the 3rd version of the P3.... likely the last as it is the latest be-spoke chassis, dual power supplies and with attention paid to the op amps sockets. The previous two "prototypes" did have a bit of low level noise. This one has no such noise.
This is with the default DIP through hole opamps in the P3... I got a bunch of opamps to play with. ;-)
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Garrard 301. Must be 30-35lb. It used to have felts under the plinth, if I knocked gently on the cabinet I could hear it, no more with the sorbotane hemispheres.
I have quite a few reel2reel tapes, rare master etc and there is zero hiss. I don't think the hiss is correlated to analog tapes at all. If the material was available, I would listen to tapes exclusively, with the Studer I use, it's all going through simple Signetics 5532 opamps and yet..
grataku: All tape has hiss, period. This is a fact that cannot be argued against successfully. If you cannot hear hiss on your fine Studer you need to check the dynamic range of your repro equipment.
Every tape that has ever been recorded has hiss -- some very small, others not so much. Again, this is a fact.
Every tape that has ever been recorded has hiss -- some very small, others not so much. Again, this is a fact.
Check the dynamic range? These are not mixed cassettes you made for your girlfriend back in the 80s. There is no audible hiss on real master tapes at least. I listened to other top of the line Hemiola tapes at friends places, hiss is not something that stands out on good recordings. Modern tapes can tolerate +10dB flux, higher DNR than LP will ever have. Determining that an LP comes from a digital or analog source based on presence of absence of hiss is not something you simply can't do.
These are not mixed cassettes you made for your girlfriend back in the 80s. There is no audible hiss on real master tapes at least. I listened to other top of the line Hemiola tapes at friends places, hiss is not something that stands out on good recordings. Modern tapes can tolerate +10dB flux, higher DNR than LP will ever have. Determining that an LP comes from a digital or analog source based on presence of absence of hiss is not something you simply can't do.
Suggest you avoid saying this in informed circles. It is both incorrect and easily proved wrong.
Wrong again. It is a suggestion and couched that way in my description. Double negative, too...
What does this have to do with the Pearl 3?