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
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
Hi,
Yep,Penta Hodos.
EL34 HISTORY.
German only but interesting nonetheless.
Cheers,
the EL34 was a penthode (as Frank calls 'em)...
Yep,Penta Hodos.
EL34 HISTORY.
German only but interesting nonetheless.
Cheers,
Hi,
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,
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,
imix500 said:Wow, Looks like a thorough history. Wish I spoke German.
You don't have to.
Just go to one of these sites, paste in the link for the website you want to translate, select the translation languages, click, and your life is jelly!
Best,
George "Babblefish" Ferguson
http://www.worldlingo.com/products_services/worldlingo_translator.html
http://www.google.com/language_tools
Hi,
While Worldlingo seems to be on strike tonight I thought I'd give Googles' service a go.
I must say I'm impressed. This is by far the best translation I've seen.
If I find the time I may just as well touvh up the lot, turn it into pdf format and archive it on CD-R for future reference.
Thanks, George
While Worldlingo seems to be on strike tonight I thought I'd give Googles' service a go.
I must say I'm impressed. This is by far the best translation I've seen.
If I find the time I may just as well touvh up the lot, turn it into pdf format and archive it on CD-R for future reference.
Thanks, George
Hi Frank,
Thanks for the history lesson! The tree at the top of the page explains it all. Phillips invented the pentode, RCA as a counter the Beam tetrode beacause of the kink that all tetrodes produce when the plate voltage falls below the screen (G2) voltage. IIRC the so called kinkless tetrodes. That's also why Phillips invented the power pentode because of that kink. That's how the U.S. version 6CA7 got around the patent issues.
There's an article in one of my Audio Express mags. that covers this. I'll have to dig it up.
Wayne
Thanks for the history lesson! The tree at the top of the page explains it all. Phillips invented the pentode, RCA as a counter the Beam tetrode beacause of the kink that all tetrodes produce when the plate voltage falls below the screen (G2) voltage. IIRC the so called kinkless tetrodes. That's also why Phillips invented the power pentode because of that kink. That's how the U.S. version 6CA7 got around the patent issues.
There's an article in one of my Audio Express mags. that covers this. I'll have to dig it up.
Wayne
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