Hi Soundhappy,
I using Lundahl LL1660 10mA with 1:2.25 mode if Im not mistaken.
Surya
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Hi Surya
Ok is this one SE model right not PP ?
http://www.jacmusic.com/lundahl/datasheets/1660.pdf
My is 600:600 impedance similar to Jensen in Mr Pass Sony Vfet CSX1 with the input transformer:
http://www.firstwatt.com/pdf/art_sony_vfet_pt1.pdf
I have good practical experience with 2SK82 amp only you can see :
L'Amp: A simple SIT Amp
With 2SK180 you can try Lundahl and what happen imho
i am sorry can't write you more about ideal configuration and what the best input transformer choice for big Tokin SIT.
simple logic ......
+50V is always +50V
while everything bellow that can always go only lower than +50V
so , positive side of cap to +50V
Thanks you guys for your advices.
Dear ZM, I will try it some day, with my test speakers. 😀
Dear Atma, active CCS will certainly improve voltage swing headroom (and power handling of the output) but, will it sound better? I tend to prefer passive CCS, in fact the inventor of the circuit -ECdesigns- made extensive test with different configurations and decided that this one was better soundwise.... but I will try a cascoded CCS sooner or later. In fact my next move will be cascoding the VFET, as I am a very big fan of cacoding the output, as my new signature suggests.
Dear Surya, I believe it is only 900mA with this "low" voltage PS. I am using a gifted Tx that is perhaps too small for the duty. I might get a more powerful SMPS for the task, as I had good experiences with them together with power regulators.
Cheers,
M.
Dear ZM, I will try it some day, with my test speakers. 😀
Dear Atma, active CCS will certainly improve voltage swing headroom (and power handling of the output) but, will it sound better? I tend to prefer passive CCS, in fact the inventor of the circuit -ECdesigns- made extensive test with different configurations and decided that this one was better soundwise.... but I will try a cascoded CCS sooner or later. In fact my next move will be cascoding the VFET, as I am a very big fan of cacoding the output, as my new signature suggests.
Dear Surya, I believe it is only 900mA with this "low" voltage PS. I am using a gifted Tx that is perhaps too small for the duty. I might get a more powerful SMPS for the task, as I had good experiences with them together with power regulators.
Cheers,
M.
Hi michael,
Can you please give specs on that coil of wire inductor? What is mH rating and DCR? Gauge and length of copper and dimensions of final spool windings. Very cool.
Can you please give specs on that coil of wire inductor? What is mH rating and DCR? Gauge and length of copper and dimensions of final spool windings. Very cool.
If memory serves, that's a 10 or 11 lb. spool of Essex 16ga, which works out to be 5 or 6 ohms and 100-120mH. 🙂
Thanks. You mean like this? I assume they ship with the distal end of the wire electrically accessible?
Essex Magnet Wire 16 AWG Gauge Enameled Copper Wire - 10 LBS - Industrial Rare Earth Magnets - Amazon.com
Essex Magnet Wire 16 AWG Gauge Enameled Copper Wire - 10 LBS - Industrial Rare Earth Magnets - Amazon.com
Like Micheal said a 10lb spool of # 16 wire will be about 100 to 120 mh and 5 to 6 ohms. I believe the 2 I have measure 5.3 ohms. But while that spool of wire does make a nice 100-120 mh inductor as it is the form factor is not all that good. In playing around with this program I calculated using a 2" coil form 1" long you may get almost 190mh from that 10 lb of wire and even that may not be the optium form. But I am too lazy to rewind my coils so will use them as is. Air Core Inductor Designer / Calculator
Might be tough to fit 10lbs (or even 5lbs) onto 2in dia x 1in long cylinder. I agree optimizations possible. Also, laminated and air gapped steel core can significantly enhance L value and keep linear within a certain range.