Tetrode or Pentode? / Tube info

FrankRoss · 24th March 2004, 04:24 PM

Other than EI, who makes the Fat Bottle 6CA7 tube which is currently and readily available? Can you point me to any web sites?

!!I'm NOT refering to the EL34/6CA7 skinny tubes!!

Thanks!

fdegrove · 24th March 2004, 06:13 PM

Hi,

The only other fat boy 6CA7s I know of are the EHs that are said to be a copy of the Sylvania/ECG 6CA7.

They're made by Reflektor in Russia.

Cheers,

FrankRoss · 24th March 2004, 06:15 PM

I'm really trying, but I'm not a sound or electrical engineer by any stretch! Based on what I read, are either the EI or the Electro Harmonic tubes actually a true 6CA7, and not something made with a bigger bulb just for looks?

I'm trying to find a TRUE Big Bottle 6CA7, the ones that everybody talks about. I know that there are EL34/6CA7 tubes available, but they are not true 6CA7's, or at least not the Big Bottle design of which I'm refering.

Can anybody elaborate on the links below and finally tell me what currently available 6CA7's are on the up and up (not just labeled as such)?

This eplains the difference between Tetrode and Pentode tubes:

http://www.mosweb.com/tp2.htm

Here's the Electro Harmonix 6CA7 tube (click on pic to enlarge):

http://www.thetubestore.com/ehx6ca7.html

And the EI 6CA7 tube:

http://www.upscaleaudio.com/rare/ei6ca7.jpg

FrankRoss · 24th March 2004, 06:23 PM

But is the EH fat boy a "true" 6CA7 or is it merely labeled as such and just simply an EL34 with a bigger bottle?

fdegrove · 24th March 2004, 06:30 PM

Hi,

This is what they say about it themselves:

EH 6CA7

Note that they claim it's a tetrode.

Other than that, I just don't know.

Cheers,

FrankRoss · 24th March 2004, 06:36 PM

I'm familiar with that link, but isn't the EL34 a tetrode? That would lead me to believe that the 6CA7EH is just an EL34 with a bigger piece of glass - correct me if I'm wrong?

dhaen · 24th March 2004, 06:38 PM

I've always thought the EL34 was a penthode (as Frank calls 'em)...

fdegrove · 24th March 2004, 06:43 PM

Hi,

Quote:

the EL34 was a penthode (as Frank calls 'em)...

Yep,Penta Hodos.

EL34 HISTORY.

German only but interesting nonetheless.

Cheers,

imix500 · 24th March 2004, 07:24 PM

Wow, Looks like a thorough history. Wish I spoke German.

fdegrove · 24th March 2004, 07:38 PM

Hi,

Quote:

Wow, Looks like a thorough history. Wish I spoke German.

If there's anything in particular you'd like to see translated, just ask...
As long as I don't have to translate the pics....

Cheers,

24th March 2004, 04:24 PM	#1
FrankRoss diyAudio Member Join Date: Nov 2001 Location: Pennsylvania	Tube Info Other than EI, who makes the Fat Bottle 6CA7 tube which is currently and readily available? Can you point me to any web sites? !!I'm NOT refering to the EL34/6CA7 skinny tubes!! Thanks!

24th March 2004, 06:13 PM	#2
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	Hi, The only other fat boy 6CA7s I know of are the EHs that are said to be a copy of the Sylvania/ECG 6CA7. They're made by Reflektor in Russia. Cheers, __________________ Frank

24th March 2004, 06:15 PM	#3
FrankRoss diyAudio Member Join Date: Nov 2001 Location: Pennsylvania	Tetrode or Pentode? I'm really trying, but I'm not a sound or electrical engineer by any stretch! Based on what I read, are either the EI or the Electro Harmonic tubes actually a true 6CA7, and not something made with a bigger bulb just for looks? I'm trying to find a TRUE Big Bottle 6CA7, the ones that everybody talks about. I know that there are EL34/6CA7 tubes available, but they are not true 6CA7's, or at least not the Big Bottle design of which I'm refering. Can anybody elaborate on the links below and finally tell me what currently available 6CA7's are on the up and up (not just labeled as such)? This eplains the difference between Tetrode and Pentode tubes: http://www.mosweb.com/tp2.htm Here's the Electro Harmonix 6CA7 tube (click on pic to enlarge): http://www.thetubestore.com/ehx6ca7.html And the EI 6CA7 tube: http://www.upscaleaudio.com/rare/ei6ca7.jpg

24th March 2004, 06:30 PM	#5
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	Hi, This is what they say about it themselves: EH 6CA7 Note that they claim it's a tetrode. Other than that, I just don't know. Cheers, __________________ Frank

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24th March 2004, 06:23 PM	#4
FrankRoss diyAudio Member Join Date: Nov 2001 Location: Pennsylvania	But is the EH fat boy a "true" 6CA7 or is it merely labeled as such and just simply an EL34 with a bigger bottle?

24th March 2004, 06:36 PM	#6
FrankRoss diyAudio Member Join Date: Nov 2001 Location: Pennsylvania	I'm familiar with that link, but isn't the EL34 a tetrode? That would lead me to believe that the 6CA7EH is just an EL34 with a bigger piece of glass - correct me if I'm wrong?

24th March 2004, 06:38 PM	#7
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	I've always thought the EL34 was a penthode (as Frank calls 'em)...

24th March 2004, 07:24 PM	#9
imix500 Proud Union Member diyAudio Member Join Date: Mar 2004 Location: Nashville, TN	Wow, Looks like a thorough history. Wish I spoke German.

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