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Old 24th Apr 2017, 10:39 am   #172
turretslug
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Join Date: Nov 2011
Location: Surrey, UK.
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Default Re: 807 (maybe) amplifier build. Now EL34

Quote:
Originally Posted by Radio Wrangler View Post
I think the reason for lower G2 voltage rating IS pentode/tetrode mode where the anode voltage goes below G2 volts and current switches across (hence the kink)

With ultra linear or triode strapping you may well get away with it.
There are a couple of glass-foot audio output tetrodes/pentodes that were also listed for video amplifier (resistive load) use- the maximum screen voltage was listed as somewhat lower for the former purpose than the latter, supporting the idea that it's a dynamic behaviour thing rather than a straight DC voltage limitation.

Also, there were quite a few amps that gave EL84s something of a thrashing as regards anode and screen voltage and dissipation, if they did anything sudden and disastrous to audio and mains ironware as opposed to just getting clapped out, it would be common knowledge.
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