DaVa FC-A1 a field coil contender
- Thread starter christensenleif@msn.com
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Dava reference is more like basic in signature the Soul is quite different.
you compared them?....
relatively easy to make one approach the other in signature by choice of arm, cable and SUT
At audioquattr. And since then he has tried the Soul across multiple arms. Reed LT, Graham, 3012r, Glanz, Ikeda. Reference stays on Ikeda
I mounted my Dava on the unipivot fatboy Vpi arm a month ago after it had been on the Dynavector 507 for a long time, a truly magical experience. 
the synergy between the components that was created was incredible. I currently power the Dava with classic 12 volt batteries while waiting for a friend of mine to complete the tube power supply. Does anyone know what the Dava's ampere mileage absorption is?
the synergy between the components that was created was incredible. I currently power the Dava with classic 12 volt batteries while waiting for a friend of mine to complete the tube power supply. Does anyone know what the Dava's ampere mileage absorption is?I believe the internal resistance of the field coil is around 100 ohmI mounted my Dava on the unipivot fatboy Vpi arm a month ago after it had been on the Dynavector 507 for a long time, a truly magical experience.
Ikeda has a bit rolled off high the Dava complements that and the authority of the arm supplements the Dava. The reference dynamic range, nuances, authority are standing out far higher.
The soul is probably back to Reed 5T now. But the Ikeda with reference is brilliant.
my best Reference combo is in Alfred Bokrand Sonoro with underhung counterweight in Groovemaster VTA lifter and DaVa cu/cu SUT
The Soul is great in Eugene Komissarows Harmony
The Soul is great in Eugene Komissarows Harmony
funny
I find the IT-407 the opposite: it adds a brilliance/metallic sheen in the HF, which is absent in Harmony and Sonoros
if you use the original Ikeda tonearmcable enclosed I understand your observation. it sounds muted
That’s my observation of Ikeda from other carts. Not muted, but a midrange emphasis and authority with smoothing off highs.
I haven’t heard harmony so can’t comment, but the Ikeda and Dava reference at his are as good as I have enjoyed vinyl along with the Vyger Red Sparrow at the general’s. Very different sounds
Ideally you want a DC voltage that is constant. A field Coil has no way to know whether the current is coming from a battery, a solid state supply, or a tube supply. If each has perfect regulation and provides a constant, unwavering voltage, it will be impossible to tell them apart.
If you hear a difference in the supplies then they are reacting to the signal generated by the cartridge. The tube supply probably has higher output impedance than the battery so can't hold the voltage as steady. You may prefer this, but you are listening to the combination of the supply and the cartridge, not just the cartridge.
I tend to agree here, and settled on a battery supply for mine. Some rechargeable "C" cell sized NiMH batteries have 3000mA capacity, so thats roughly 30 hours per charge. I haven't been able to re-locate the article but it was stated that NiCD and NiMH provide a cleaner DC than lithium-based batteries.
EDIT: Found it: https://tf.nist.gov/general/pdf/1133.pdf A lot older than I remembered.. so I wonder if the data on lithium based batteries is still relevant as they have come a long way since then.
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Hi guys, although I will build the tube power supply because the magic light of the tubes creates a strong visual addiction for me, I found this battery pack on the web that would guarantee me at least eighty hours of good listening, but if I wanted to be able to vary the current from 10.5 volts to 12 volts how could I do it, could I use resistors?
When you have found the optimal voltage, determine the resistance value and use a good 2 watt resistor e.g. Vishay then support the voltage with cap 47uf nichicon supertrough. Its a better solution.
if the coil needs about 100mA and you want to drop about 2V that equates to about 0.2 watts. While a 2W resistor will certainly work, it does not need to be that big. Half watt is plenty big.
The output impedance of the power supply (internal resistance of the battery + resistance of the wires) plays a role in how it sounds and this resistor will increase it by a huge factor. To drop it from 12V down to 10V will take about a 20Ω resistor. Assuming the battery has an internal resistance of 0.1Ω (it varies) then you just increased it 200 times with your 20Ω resistor. Following that with a cap will decrease it again, but the cap also has a sonic character, and the Zout will still be higher than without. One way to reduce that factor is to use an active voltage regulator, but again that will (may?) sound different.
All that said, there is no way to predict how it will affect the sound and more importantly, which you would prefer. Like most things in this hobby, you will have to try it.
The output impedance of the power supply (internal resistance of the battery + resistance of the wires) plays a role in how it sounds and this resistor will increase it by a huge factor. To drop it from 12V down to 10V will take about a 20Ω resistor. Assuming the battery has an internal resistance of 0.1Ω (it varies) then you just increased it 200 times with your 20Ω resistor. Following that with a cap will decrease it again, but the cap also has a sonic character, and the Zout will still be higher than without. One way to reduce that factor is to use an active voltage regulator, but again that will (may?) sound different.
All that said, there is no way to predict how it will affect the sound and more importantly, which you would prefer. Like most things in this hobby, you will have to try it.
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