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led biasing 6n1p in se 84cs special (Read 2615 times)
ko
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led biasing 6n1p in se 84cs special
12/12/09 at 16:06:10
 
hello everybody
after putting in this amazing hazen grid mod ,i was reading in a diy audio forrum about replacing the cathode resistor by leds ,i couldnot resist trying it in my very heavely tweakt zen kit so i put 2 red 2volt leds in serie to each of the to cathodes of the 6n1p ev and got a beautiful stabil minus 3,72volts , the sound became more dynamic ,more smooth and vet ,i am loving it






marry xmass everybody

grtz zenlover  [smiley=simp38.gif]
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« Last Edit: 12/12/09 at 16:09:24 by ko »  
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dank
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pair of dual 18
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Re: led biasing 6n1p in se 84cs special
Reply #1 - 12/12/09 at 23:09:01
 
ko

I'll have to try that.  What about the output tubes, have you tried anything like this in that circuit?  They should be biased around 10.25v so you would need 5 or 6 of them in series.  Or do 5 led's and a foward bias silicon diode.  I would guess that any sonic change due to this mod would be more noticable in the output stage than in the input stage.  Also might try adding a couple of capacitors across each set of your 2 led's, 100 uf or so.

Dank
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ko
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Re: led biasing 6n1p in se 84cs special
Reply #2 - 12/13/09 at 10:31:48
 
hello dank
i think that the current[ampere] is to high for leds with the output tubes
the voltage would be ok with 6 leds , with the 6n1p it just about  5ma ,so there it works great ,it really a big improvement in the sonic  of my amp
  grtz ko  :)

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lightmaster
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life is too short
for bad hifi.
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Re: led biasing 6n1p in se 84cs special
Reply #3 - 12/13/09 at 21:06:37
 
HI Ko
thxs for the tip, could you please say a little more. What resistors did you have in place before, brand, wattage, value??? and can you say a little more about the differences between now and then?? thxs a lot.
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ko
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Re: led biasing 6n1p in se 84cs special
Reply #4 - 12/13/09 at 22:30:36
 
wel after soldering and trying many different things to my zen kit ,i found it time for a complete rebuild ,and i wanted to build it like a tank
,all value,s are the same as on the schematics of the zen cs ,de oversized resistors are arecol ,i got all the parts from a army electronical surplus store ,the condentsators are rusian pio ,s 0,22 uf 1000volts ,these gave a real improvement in the sound ,the tubes are voskod 6n1p ev 1970 production as a driver and  6n15p ev [sv83]
as output tubes  a 1960,s svetlana 5u4[sint petersburg build ] as rectifier
the bigest improvement in comparesy with the original zen kit where the pio condensators ,the hazen grid modification , the led biasing
the rest will just last for a lifetime because of the oversizing
the power suply was changed because we use 230v here in the netherlands ,
   grtz ko
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CDesign
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Re: led biasing 6n1p in se 84cs special
Reply #5 - 01/03/10 at 08:18:55
 
Quote:
here in the netherlands


Maybe you can help me?
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ko
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Re: led biasing 6n1p in se 84cs special
Reply #6 - 01/03/10 at 14:15:14
 
what the problem you need help with? i am located in amsterdam
grtz ko  :)

happy new year to everybody here  ;)
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