Thanks to you and Grimberg for your reponses.
Re PCB: Tea-bag has a design and GB going on right now:
http://www.diyaudio.com/forums/grou...ersion-2-al-boards-tea-bag-3.html#post4884995
However, I'm also very intrigued by Nagini's response here:
http://www.diyaudio.com/forums/pass-labs/276711-sony-vfet-amplifier-part-2-a-85.html#post4559523
Dennis
Thanks all for comments!
+ The XLR jacks just connect pin 2 (HOT) and pin 3 (COLD), not use pin 1 (GROUND) => without ground loop.
+ The schottky rectifier is 40A and 45VDC reverse so the Vf is very low => just a little warm when running
+ I use only one 3A fuse in this amp
+ About the PCB: my first PCB from bad PCB maker so now I order from another PCB maker with higher quality: 2mm thick, 2 OZ copper and gold plate. I just build some PCBs for my friends and send to two members in this forum as a gift, not for sale. This is the design and copyright by Mr Pass so I can't public if I have no approve from him
+ The XLR jacks just connect pin 2 (HOT) and pin 3 (COLD), not use pin 1 (GROUND) => without ground loop.
+ The schottky rectifier is 40A and 45VDC reverse so the Vf is very low => just a little warm when running
+ I use only one 3A fuse in this amp
+ About the PCB: my first PCB from bad PCB maker so now I order from another PCB maker with higher quality: 2mm thick, 2 OZ copper and gold plate. I just build some PCBs for my friends and send to two members in this forum as a gift, not for sale. This is the design and copyright by Mr Pass so I can't public if I have no approve from him
Again, very nice build.Thanks all for comments!
+ The XLR jacks just connect pin 2 (HOT) and pin 3 (COLD), not use pin 1 (GROUND) => without ground loop.
+ The schottky rectifier is 40A and 45VDC reverse so the Vf is very low => just a little warm when running
+ I use only one 3A fuse in this amp
+ About the PCB: my first PCB from bad PCB maker so now I order from another PCB maker with higher quality: 2mm thick, 2 OZ copper and gold plate. I just build some PCBs for my friends and send to two members in this forum as a gift, not for sale. This is the design and copyright by Mr Pass so I can't public if I have no approve from him
So, the XLR is used as a single ended connector just replacing the RCA.
Where do you obtain the tantalum resistors?
Regds
/RK
Oh! Your eyes is very good because you saw the tantalum resistors on the board
I used z-foil resistor for input and some Audio Note tantalum resistors on the signal path, you can follow this link below:
0.5W Audio Note Tantalum resistors | Hifi Collective
Thank you very much. Although my eyes are still very good, I must admit I remember you wrote about using tantalum in an earlier post. In you earlier build the silver (or natural alu) finished chassis.
I bought tantalum resistors from Erno Borbely earlier - for a RIAA. Twenty years ago.
/RK
I bought tantalum resistors from Erno Borbely earlier - for a RIAA. Twenty years ago.
/RK
In the previous Sony VFET P2, I used Audio Note tantalum non-magnetic, this amp just using the normal Audio Note tantalum
There is another tantalum resistor, that is Shinkoh and I think it's good
, you can follow this link:Shinkoh Tantalum Resistors | Hifi Collective
How much heat sinking is needed for these cascode mosfets?
Depending on the specific build, I see them mounted on the main heat sink or not. Is amp bias/offset more stable when the mosfets are thermally coupled to the VFETs?
Any reason a Tekpower-TP3005D-3 DC Linear power supply wouldn't be adequate for my mosfet/vfet testing needs?
https://www.amazon.com/Tekpower-TP3...id=1480099498&sr=8-6&keywords=Tekpower+linear
https://www.amazon.com/Tekpower-TP3...id=1480099498&sr=8-6&keywords=Tekpower+linear