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12/22/14 at 11:22:16


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Zen select input tube bias - Anyone mod for LED? (Read 595 times)
nubz69
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Posts: 27
Zen select input tube bias - Anyone mod for LED?
05/25/13 at 18:34:04
 
I'm just curious if anyone has tried using an LED bias for the input tube on their amplifier and if it was a worthwhile mod.
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clowkoy
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Posts: 52
Re: Zen select input tube bias - Anyone mod for LED?
Reply #1 - 05/25/13 at 20:30:09
 
You can try 2 hlmp 6000 in series same as what I did with the zkit/zstage (12au7). I didn't like the sound though.
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nubz69
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Posts: 27
Re: Zen select input tube bias - Anyone mod for LED?
Reply #2 - 05/27/13 at 01:33:37
 
Just modded my amp.  Now one switch setting is the original high bias level and the other is led biased.  There is a very clear improvement accross the board with the led bias.  I have had this amp for 10 years and I still love it.  This is my first major mod to the amp.  If I try anything else I may put a ccs on the output tubes.  

Here is some more info on led bias.
http://www.diyaudio.com/forums/tubes-valves/76025-ping-sy-led-cathode-bias.html
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