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Old 21st March 2012, 06:08 PM   #11
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Join Date: Nov 2009
Location: Cortez, CO
Many have run these tubes way past 250 plate volts, some close to 600V. You can easily put these in a Dynaco ST-70 with 470 volts.
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Old 21st March 2012, 10:30 PM   #12
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Join Date: Dec 2006
Location: Southwest Chicago Suburbs
Originally Posted by DeathRex View Post
Many have run these tubes way past 250 plate volts, some close to 600V. You can easily put these in a Dynaco ST-70 with 470 volts.
Yes they will do fine in a Dyna! I even match them at 465 volts on the plate and screen, and I've sold a number that have gone into 500+ volt applications. So I'm speaking from personal experience.

They will run at 25-30 watts dissipation all day and never show any strain.

That 250 volt figure must not be a rated maximum. I can't read Cyrillic, but I suspect that's a "typical operation" point like in western tube manuals.
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Old 22nd March 2012, 12:29 AM   #13
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Join Date: Jul 2008
I tried them in a few amps, no problem with 6l6 and 5881 applications. el-34 applications seem to show glowing grids and scorching patterns on the glass that match anode they won't last long in an el-34 application. bias probing them while on my tube tester puts them in the same Ip range as 6l6's and 5881's. They do sound better than 6l6's.
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