I read somewhere a while back that a tube plate's maximum power dissipation is the absolute maximum instantaneous power. Is this true? It doesn't make much sense to me why it would be as transient fluxuations in instantaneous power shouldn't really effect the plate's thermal characteristics much?Here I'm talking about the power in the audio spectrum so no transients are longer than 10ms or so and there is generally an equal and opposite reduction in instantaneous power for all increases.But maybe there is some specific reason why this was said?

"Jeff Johnson"** Nope.** Correct.** Yep - the speaker was an idiot.BTW:Dissipation cannot be "rms" - just peak or average watts..... Phil

Are tube plate dissipation's peak or rms?

Feb 24, 2011 46 Replies

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Tim Wescott 15 years ago

Take your meds.

Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html

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Jim Thompson 15 years ago

He is. Imagine what he would be like if he wasn't ;-) ...Jim Thompson

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Phil Allison 15 years ago

"Tim Wescott"

** Wot an absurd waste of space you are - pisshead.

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Michael A. Terrell 15 years ago

He would cause the sheep to stampede, and they would trample him to death.

You can't fix stupid. You can't even put a band-aid on it, because it's Teflon coated.

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ChrisQ 15 years ago

29 tubes !. The heater transformer must have run 10-15 amps, or was it series string with selenium half wave rectifier for the ht ?. Those old selenium rectifiers had a very characteristic smell when they failed and not exactly healthy either...

Superhet was a luxurious dream for the very early homebuilt designs, at least here in the uk :-)...

Regards,

Chris

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Tauno Voipio 15 years ago

When running 6 EL505's for 900 W, the glass envelopes developed dimples similar to the Haig Whisk(e)y bottles.

Tauno Voipio, OH2UG tauno voipio (at) iki fi

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Phil Hobbs 15 years ago

I've heard of pinchoff biasing, but that's ridiculous. ;)

Cheers

Phil Hobbs

Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 email: hobbs (atsign) electrooptical (period) net http://electrooptical.net

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