Poweramp valve specs...

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KH Guitar Freak
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Poweramp valve specs...

Post by KH Guitar Freak » Thu Apr 14, 2011 3:47 pm

Hey guys. I was wondering what specs I should look out for when it comes to buying non Mesa poweramp valves beyond merely making sure that the mA rating is within tolerance. Thanks...

Oh btw, I take it that a rating of 31.5mA for a matched quad would be ok to use in a Mesa amp???

KH Guitar Freak
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Re: Poweramp valve specs...

Post by KH Guitar Freak » Fri Apr 15, 2011 2:14 am

Ok, the rating the seller has given for the matched quad are 31.5/2.73. Not sure what "2.73" stands for but...

zodiac272
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Re: Poweramp valve specs...

Post by zodiac272 » Fri Apr 15, 2011 12:57 pm

what kind of valves... 6L6 or EL-34, and which amp? I'm pretty sure my mark II's take tubes from high 20 to low 30's in mA. The 2.73 may be the gm or mutual conductance. which is ma/V, and is another parameter in matching tubes.

I don't know enough to say "yes" those tubes are safe, but I think they are within the proper range. It depends on the voltage and current of his tester i think.

will someone that knows what they are talking about please help me :D

scott
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KH Guitar Freak
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Re: Poweramp valve specs...

Post by KH Guitar Freak » Sat Apr 16, 2011 2:25 am

6L6s. Would be going into either the Roadster head or Mark V head...

stokes
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Re: Poweramp valve specs...

Post by stokes » Fri May 06, 2011 10:29 am

Depends entirely on where they got that 31.5 ma from.I can put those same tubes in my tester,adjust the bias and or my plate voltage and get 37.8 ma's.Unless a supplier says they are tested to match Mesa's specs,you cant be sure.

KH Guitar Freak
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Re: Poweramp valve specs...

Post by KH Guitar Freak » Sat May 07, 2011 2:11 pm

stokes wrote:Depends entirely on where they got that 31.5 ma from.I can put those same tubes in my tester,adjust the bias and or my plate voltage and get 37.8 ma's.Unless a supplier says they are tested to match Mesa's specs,you cant be sure.
Ah yes. I've clarified that with my valve supplier a while ago. Installed them in a Randall RM100KH instead. Cheers...

rs16iandy
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Re: Poweramp valve specs...

Post by rs16iandy » Sat May 07, 2011 7:55 pm

Get in contact with eurotubes there very helpful

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