• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

8236's

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Good afternoon,
It's been a quite a while since I've been around. Got a new job at Corning Glass, bought a house in Pennsylvania, wife's kid finally moved out! I actually can play again!
Has anyone played with 8236's? Got a deal on a pair on that dreaded auction site. It appears the 8236 can take quite a bit of plate voltage, though like the sweep tubes, the screen voltage is low. Anybody have any ideas on P2P load with 700v on the plate and 150v on G2?

Thanks,
Ray
 

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Congratulations on the new gig! I came really, really close to going to work for them before deciding to go to ITW instead. Great company. Are you working out of Corning?

From the datasheet, these look like a good candidate for screen drive.
 
I am based out of Corning.
I was laid off from the lawfirm in April of 2012. I got this job in January of this year. But, good things come to those who wait, they are paying me close to 3times what the law-firm was paying me and 2 weeks vacation from the start.
Things ok with you these days? I never did follow up concerning the 6M11. How did you ever make out?

Ray
 
Nice deal! Corning is a great little town and we would have been extremely happy there (it's near my wife's family in Alfred). The job was doing patent analysis, which is less interesting but less stressful than what I'm doing now. Ah, well. Glad you got out of that law firm!

I used the 6M11 in a tone control line stage prototype- worked like a charm.
 
From Frank's. this looks like a "hardened" 6DQ5. As such, no audio operating points. I'd get that voltage down, so you'd come closer to Class A operation. The HD types can pull the bigamps without requiring high voltages. That means lower load resistances, and easier to wind OPTs. Grid drive or screen drive would work with this type.
 
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