Would you care to think about this and if you find it interesting enough propose a circuit? I would give it a go at once...
Sorry Salas- I forgot - Please
Regards
There was an old thread about an MC pre-pre solution based on 2X 2SK170BL from the older simplistic phono preamp version's PDF instructions. It had its own chip reg and cap multiplier filter. There were some happy builders.
I could add a 20dB gain FSP based pre-pre there when I will find the time to study a schematic.
Thanks Salas. No hurry - a tube phonoamp is a few builds away - a year maybe...
I keep watch ... Could you add a link to the thread you are thinking of?
Maybe you are refering to this : http://www.diyaudio.com/forums/analogue-source/303969-there-tube-mc-riaa-4.html#post5086532
Regards
I keep watch ... Could you add a link to the thread you are thinking of?
Maybe you are refering to this : http://www.diyaudio.com/forums/analogue-source/303969-there-tube-mc-riaa-4.html#post5086532
Regards
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There was an old thread about an MC pre-pre solution based on 2X 2SK170BL from the older simplistic phono preamp version's PDF instructions. It had its own chip reg and cap multiplier filter. There were some happy builders.
I could add a 20dB gain FSP based pre-pre there when I will find the time to study a schematic.
Hi Salas. Why not use the sk369's as first line for past 60dB gain?
The rest of the supporting circuits just have to be follow and they are several.
Regards
Yes that was the 2x 2SK170BL pre-pre.
I will keep the K369 if in an FSP style pre-pre.
Interesting - why?
Regards
Because its better to keep the original K369 choice in an FSP style pre-pre so to know what to expect
Would you be kind to elaborate on this? I do respect your claim on that it would be better because you say so. It is the second part that puzzels me.
The reasons I can think of is that it would be overkill, they might be rare so it is better to save them for a proven circuit...
Regards
Can´t I elevate all 4 tubes to 95-100v so that I can have 1 6N2P and 6SN7 peer channel??
Choose a value in the middle between the two cathodes and check datasheet allowance.
Even within allowances it can affect sound though since the clearence of the heater and the cathode is often just a thin layer of oxide. (Note that I said can affect sound, I did not say for the better or for the worse)
If you will decrease it by few nF the upper bass circa 100Hz bumps. If you will leave it alone and increase the 50K resistor by few k the low bass around 30Hz will bump. If you will perform both mentioned actions together the whole region below 800 Hz rises in an angle.
Interesting explanation Salas, I ask because I'm comparing the vinyl sound vs the DSD noDAC sound and DSD noDAC sounds with more in lows & lows-mids, vinyl sounds less solid vs DSD noDAC.
I am disappointed in yet not finding a combination of USB DAC + drivers + player software that stay steady in neutral tone each time I change one parameter or software layer. Whatever tweak makes your speakers sounding most balanced in your room for most of your vinyl discs is a down to earth practical approach in personal DIY use.
Attached pic work in progress new PSU box for the Itch.
What's that trafo?
Lundahl LL 1683, for heaters I will use the two 6.6VAC 3A each, for B+ I'm paralleling the two 250VAC 80mA to have 250VAC 160mA.
Try the same combo I'm using:
Amanero USB-I2S
noDAC only LPF 1st order RC or 4th order LCLC (actually using thanks to abraxalito diya member)
Daphile player (free) Daphile – Digital Music Convenience for Audiophiles
N.B. Daphile set to convert all PCM files to DSD files.
If possible use a powerfull PC intel I7 17Gb RAM to avoid dropouts when Daphile converts on the fly PCM to DSD files.
Avoid 1st order RC LPF because I listened digital noise.
Salas where can connect one LED to show PSU is powered?
I don't have any regulators inside PSU box.
For 4th order LPF LCLC don't use use aire core inductors, I use Jantzen wax coils with great success, for resistors used Welwyn RC55 & Shinkoh both superb.
I'm sorry Salas I don't understand this phrase?
I am disappointed in yet not finding a combination of USB DAC + drivers + player software that stay steady in neutral tone each time I change one parameter or software layer. Whatever tweak makes your speakers sounding most balanced in your room for most of your vinyl discs is a down to earth practical approach in personal DIY use.
Try the same combo I'm using:
Amanero USB-I2S
noDAC only LPF 1st order RC or 4th order LCLC (actually using thanks to abraxalito diya member)
Daphile player (free) Daphile – Digital Music Convenience for Audiophiles
N.B. Daphile set to convert all PCM files to DSD files.
If possible use a powerfull PC intel I7 17Gb RAM to avoid dropouts when Daphile converts on the fly PCM to DSD files.
Avoid 1st order RC LPF because I listened digital noise.
Salas where can connect one LED to show PSU is powered?
I don't have any regulators inside PSU box.
For 4th order LPF LCLC don't use use aire core inductors, I use Jantzen wax coils with great success, for resistors used Welwyn RC55 & Shinkoh both superb.
Whatever tweak makes your speakers sounding most balanced in your room for most of your vinyl discs is a down to earth practical approach in personal DIY use.
I'm sorry Salas I don't understand this phrase?
Attachments
Salas where can connect one LED to show PSU is powered?
I don't have any regulators inside PSU box.
Across a heater trafo output via 2.2K LED protection resistor I guess
I'm sorry Salas I don't understand this phrase?
I meant not sure if trying to emulate a digital reference's tone for a good press vinyl version replay is best goal. Better is to change whatever you change in the TT or phono, like little RIAA values play, to try have good tone i.e. neither heavy nor bright for the most range of your records possible. In your own specific system and space. Since digital replay hardware & software vary too but vinyl also if not even more.
Across a heater trafo output via 2.2K LED protection resistor I guess
Thks I want to put it inside PSU box.
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