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Old 23rd June 2009, 02:26 PM   #1
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Default Tubes that have round/curved plates. . .

Does anyone know of any tubes, whether they be output or driver tubes, that have nice , round plates like the 6V6 or 6SL7 ?

Thanks..........................Blake
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Old 23rd June 2009, 02:32 PM   #2
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Do voltage regulators (0D3, etc.) count?
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Old 23rd June 2009, 03:03 PM   #3
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Sure !

I am mainly concerned with driver and output tubes though.

6CA7 , round or flat ?

KT88 , round or flat ?

EL34 ?

EL84 ?

6l6 ?

6SN7 ? (I looked at an old one yesterday that looked triangulated !)

6GK5 ?

Etc................................Blake
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Old 23rd June 2009, 03:30 PM   #4
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6V6 is oval, not round !
6F6 is round.
Almost all BPT are flat.

Some triodes can be built both ways, it's a manufacturer decision.

Why do you ask that ?

Yves.
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Old 23rd June 2009, 04:31 PM   #5
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6AQ5s all seem to have nice big cylindrical plates.  They all seem as well to tend to microphonicity.  Ring like a bell when you tap on them.

Hm,

Poinz
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Old 23rd June 2009, 05:55 PM   #6
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I have round plate examples of 50C5, 6AQ5, and 6BQ5.
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Old 24th June 2009, 04:12 AM   #7
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6AV6, if I remember correctly, a 12AX7-like triode with a round (cylindrical) plate with two small diodes along for the ride.
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Old 24th June 2009, 04:18 AM   #8
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KT88 is most definately flat.
NOS GE 12v6GT (beam pentode like kt88) have a bent plate and cathode sorta like ( and ) but a little straighter
i might even go as far just to call it a tappared edge
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Old 24th June 2009, 05:18 AM   #9
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Default Eimacs

Eimac tubes have cylindrical anodes and they glow
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Old 24th June 2009, 12:48 PM   #10
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Thanks for all the responses.

"Almost all BPT are flat." What is BPT ?

Seems as though 6V6 ( Which I erroneously called 'round' , I meant 'round-ed') and 6SL7 both have the reputation of being very smooth sounding , and the 6V6 is supposed to be a very linear device (IDK about the 6SL7).

I was curious to see if there happened to be any correllation between a tubes sonics and it's architecture.

In my simple mind, it would seem that a smoothly curved/rounded plate would make for a better design , no edges or corners to offer deviations to the signal.

Probably sounds stupid, but now you know why I asked.

Are any of the popular tubes I listed above rounded/curved ?

6CA7 , rounded or flat ?

EL34 ?

EL84 ?

6l6 ?

6SN7 ?

6GK5 ?


Thanks again...........................Blake
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