Tubes that have round/curved plates. . .

Nihilist · 23rd June 2009, 02:26 PM

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

Ty_Bower · 23rd June 2009, 02:32 PM

Do voltage regulators (0D3, etc.) count?

Nihilist · 23rd June 2009, 03:03 PM

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

Yvesm · 23rd June 2009, 03:30 PM

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.

Poindexter · 23rd June 2009, 04:31 PM

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

jerluwoo · 23rd June 2009, 05:55 PM

I have round plate examples of 50C5, 6AQ5, and 6BQ5.

wrenchone · 24th June 2009, 04:12 AM

6AV6, if I remember correctly, a 12AX7-like triode with a round (cylindrical) plate with two small diodes along for the ride.

bacon665 · 24th June 2009, 04:18 AM

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

Michael Koster · 24th June 2009, 05:18 AM

Eimac tubes have cylindrical anodes and they glow

Nihilist · 24th June 2009, 12:48 PM

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

23rd June 2009, 02:26 PM	#1
Nihilist diyAudio Member Join Date: Aug 2006	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 __________________ Keep it simple My Page Of SV and DIY Stereo Links

23rd June 2009, 03:03 PM	#3
Nihilist diyAudio Member Join Date: Aug 2006	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 __________________ Keep it simple My Page Of SV and DIY Stereo Links

24th June 2009, 12:48 PM	#10
Nihilist diyAudio Member Join Date: Aug 2006	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 __________________ Keep it simple My Page Of SV and DIY Stereo Links

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23rd June 2009, 02:32 PM	#2
Ty_Bower diyAudio Member Join Date: Mar 2007 Location: Newark, DE	Do voltage regulators (0D3, etc.) count?

23rd June 2009, 03:30 PM	#4
Yvesm diyAudio Member Join Date: Jul 2004 Location: Ardeche	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.

23rd June 2009, 04:31 PM	#5
Poindexter diyAudio Member Join Date: Oct 2004 Location: Maui, Hawai'i, USA	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

23rd June 2009, 05:55 PM	#6
jerluwoo diyAudio Member Join Date: Feb 2006 Location: Ashland,Ky U.S	I have round plate examples of 50C5, 6AQ5, and 6BQ5.

24th June 2009, 04:12 AM	#7
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	6AV6, if I remember correctly, a 12AX7-like triode with a round (cylindrical) plate with two small diodes along for the ride.

24th June 2009, 04:18 AM	#8
bacon665 diyAudio Member Join Date: Apr 2009	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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