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In Reply to: RE: Look what I founded in your attic Mommy. posted by Michael Samra on August 14, 2016 at 01:37:47
"Too many big mouths on here drove up the price by saying how good they were."
Uh, Michael... Have you looked in the mirror today? :) :)
I still have my box of 100, purchased shortly after you first started talking them up. About 30 were gassy, but I sent them back to the Ukraine and the seller shipped back perfect replacements. Great tubes, I have yet to give them a really rigorous workout.
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Buy Chinese. Bury freedom.
Follow Ups:
If you have a way to run them the gassy tubes will be fine after a good run in. But don't use ANY of the 6P3S-Es unless you test them thoroughly, especially for grid current/gas.
Jim, I used a test amp for grading, roughly +400V on the anodes. As you say, a number of slightly gassy tubes were fine after running them in for 10 to 15 minutes. The ones I sent back were those in which quiescent current started out higher and never fell to an acceptable level.
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Buy Chinese. Bury freedom.
Wow, that's surprising that they didn't come down. Thanks much for the clarification.
Just FYI I ran mine at 465 volts on the plate and screen and -50 on the grid which usually resulted in cathode currents of about 25 to about 50 ma. They ran for multiple hours...
Uh, Michael... Have you looked in the mirror today? :) :)
NAH not me..LOL Of course I was referring to myself.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Mike, what's ya gonna do with all those tubes?
What else,I'm going to stuff them in my daughter's old bedroom where I have tons of other stuff stored.LOL.I've been using them in my many 6L6 and EL34 based amps as well as selling a quad here and there.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Get a Cit. 5 and see if they will hold up. Maybe tweaking the "idle" current would be needed.
Eli D.
Aren't these tubes 19watt?
The 6П3C-E (6p3s-e) is supposed to be much like a 7581, unlike the 6П3C.
We must be careful about Russian types, as the suffixes are very significant. The 6П14П is, at best, a mediocre EL84 equivalent. OTOH the 6П14П-EB, AKA EL84M, is a quite nice and very tough 7189 equivalent.
Eli D.
I'd be inclined to consider the 6П3C-E to be much closer to 5881 than a 7581. A translated data sheet calls out anode dissipation rating @ 20.5W while the 7581 is 30W and the 7581A is 35 W. I'm sure the 6П3C-E ratings are conservative because they're based on a 5,000 hr nominal life. I've run them @ 25W on the anode and they don't red plate or show other signs of distress.
I'd be inclined to consider the 6П3C-E to be much closer to 5881 than a 7581
You are actually correct.The 6N3C-E is often sold as a 6L6gc,mainly because of its mil-spec ability to handle the 500v of the 6L6gc,even tho it dissipates roughly the same wattage as a 6L6GB or 5881.In other words,they do have a lower dissipation rate than a 6L6gc but,they can still handle the voltage and current of the 6L6gc.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Not only great sounding but long lasting! I got two quads from Jim in 2010 and have used the first quad for thousands of hours and they still test and sound new. The other quad has not been touched. Also picked up a box of 36 from a local guitar player a few years back for $100 Canadian (about $70 US). I think that should be a lifetime supply.
I too am loving the GL kt66 and intend to compare them to the 6P3S-E. But those are well over $200 US per quad. The 6P3S-E were $65 a quad fully tested from Jim and even cheaper untested by the box. That was a bargain that is unlikely to be equaled again in output tubes.
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