CCV Bias why so high?

  • Thread starter Thread starter rokker
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rokker

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I wonder why CCV's are biased sooo high. Like 50ma or higher?
Is it because the Primary impedence is around 3.4 which would allow higher biasing than the 70% dissipation rule would indicate?

I am very interested to know if Brad, Dave F., Mark C. Or anyone else who may know would let me know i would appreciate it. I lowered it to 34 to be safe until i learn more about this.
If there is no reason for it why bias so high? Just trying to better understand this.
Thanks
 
Checked it on the high power setting...plate voltage was 545 on high and 465 on low
 
I love learning this shit:)
Rig Talk frikin rules!!
 
From Marks mouth directly:

"I set the Bias hot because it sounds best to me. I designed the amp to run a hot bias on high power and that contributes to the tone I like. I have had no problems with premature tube failure with the hotter settings"
 
Thanks brad. Will raise it back up. Thanks to other responders too
 
I lowered mine just a little bit yesterday and swapped some preamp tubes. I put a Sovtek LPS in v1, Ruby Chinese C5+ in v2/v3, C5 in v4 and a Penta Labs 12ax7B in the PI. I'm gonna order a quad of SEDs soon to try those out for the power amp.

snapped a naked picture...

dc51af57.jpg
 
mhenson42":ko5m9puv said:
I lowered mine just a little bit yesterday and swapped some preamp tubes. I put a Sovtek LPS in v1, Ruby Chinese C5+ in v2/v3, C5 in v4 and a Penta Labs 12ax7B in the PI. I'm gonna order a quad of SEDs soon to try those out for the power amp.

snapped a naked picture...

dc51af57.jpg
Click to expand...

nice almost there... get some winged c's in there now....
 
PS - ive always ran my ccv around 40 - 45 mv .... hotter does sound better. never had any issues.... 3 years and counting owning my ccv....
 
Are those ARS re-branded Telsa tubes or JJ labeled? If they are ARS, I will buy your quads from anyone replacing them.

Steve
 
They are ARS labeled JJs. I'm keeping mine for back-ups even when I replace them with SEDs
 
All I know is when Mark finished mine he said he didn't even measure it... Just by ear! And Wow was it high... This is over 2 years ago.

I set mine on 55ma in High cause man it just sounds so Dam Bass Ass like that! Timing is better fluidity is better... It's So Solid at that bias I do recomend Winged =C='s though :yes:

IT JUST SOUNDS FREAKIN AWESOME! :worship: :worship: :worship:

Roid
 
50 ma....each tube :scared:

el34 are 25 w plate dissipation, so with about 560 volt, 100 % current would be about 45 ma per tube...

....meaning that you guys are biasing at more than 100% ?!!!
 
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