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sorenj07 12th October 2007 09:37 PM

6AG7 UL Curves
does anybody have them, or have the equipment to trace them out? Standard 40% winding ratio...

percival007 14th October 2007 08:55 AM

6AG7 UL Curves
Not sure if this is what you're after?

Cheers, James.

sorenj07 14th October 2007 05:34 PM

Thanks, but those are regular pentode curves..

Tubes4e4 15th October 2007 08:41 PM


tracing UL-curves is not a big deal per se, but picking a suitable operation point for any UL ratio in advance (before doing the tracing) is. But some experience helps, especially if one has the trioded curves already.

Sadly, I donīt have any thrustworthy 6AG7 (or 6AK7) in the drawers.



P.S: Among others, some of my UL tracings you can find here. F.e, have a look at the ECL82 set of UL tracings to see how critical the OP (Ea, Ia, Eg1) can be when it comes to chose on an UL ratio.

sorenj07 15th October 2007 11:20 PM

Thanks for the very informative page! I didn't know you were Tom - you post on AA now and then, right? Anyway I'm kind of putting aside the 6AG7 project at the moment, in favor of a PP 6S19P amplifier.. As good as pentodes in UL can sound, I've been bitten by the triode bug.

The problem is, I should probably load up on 6S19P's before finishing this project, because as far as I know, this will have been the first project to implement 6S19P's in push-pull accessible by Google. And that means price hiking! Within a year or so I've seen the prices of those Russian PIO caps skyrocket on eBay, they know what they're doing :hot:

Tubes4e4 16th October 2007 05:15 AM


I didn't know you were Tom - you post on AA now and then, right?
Sorry, no - I donīt even know what AA is, except for a battery size :cannotbe:


sorenj07 16th October 2007 05:17 AM

audio asylum? maybe I'm mistaken.. or is it audiokarma? no big deal.

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