mercury vapor... i love it!!!

x84andrea · 12th November 2007, 03:38 PM

hi friends, I wanted to have a little more information about these tubes, i want to build a SE with the gm70 or 100th, and i need of an high voltage rectifier, I love the blue light of these tube!
i don't have problems to get large capacitors, this is a problem for the tube rectifier, true?

It's better for you a CLC with a biginductanze or a CLC with a little inductanze but big capacitors?

and What is for you a valve with a beautiful light? and do you have photos of these tubes in operation?

866a or 3b28 are good? or is little for my amp?
I have see a 872a, it's good for me?
thanks andrea

Gluca · 12th November 2007, 03:47 PM

Do you mean something like this?

Here is my 100TH CCS loaded (DN2540 cascode) into a parafeed GM70.

Nice tubes. Lovely sound. I am planning to build a preamplifier with those 100THs.

OH! Mercury rectifers DONT like cap input filters. What you need are chokes. 3B28 does not have that blue glow but you dont need to warm the filaments up. 872A is way too big.

Ciao
Gianluca

the_manta · 12th November 2007, 03:51 PM

866 and 3B28 are electrically the same, but 866 uses mercury whereas 3B28 uses Xenon gas. This also means that the 3B28 only needs to heat up a few seconds and not a half minute like the mercury vapor rectifiers. On the other hand it is said that the gas rectifiers produce more HF noise.

Personally I like the 3B28 very much, because of the violet purple glow. I always heat them up with a cheap SNT, actually designed for 12V halogen spots. You will only need two windings for the 2,5V.

Regards, Simon

GaryW · 13th November 2007, 02:55 AM

I have a 300B PP amp with a pair of 866As. I did have 83's but like the glow of and availability the 866's more. Here's a picture with the 83's....

Carlp · 13th November 2007, 04:25 AM

Mercury...bad stuff even if you like the blue color. I'm intrigued by the 3b28 xenon version though. Few environmental side effects that I can find, basically inert, but I have read about its use for generating ultraviolet light. Anyone know anything about these tubes? Any concern re: UV light?

Carl

x84andrea · 13th November 2007, 07:25 AM

only 866a?
the 3b28 is good for me, it have 500ma and 1-2second to start, but i have a gm70 for the final, it need time to heat up... there are annother tube with more light of a 866 and more current?

Gluca · 13th November 2007, 10:56 AM

EIMAC RX21

7N7 · 13th November 2007, 11:10 AM

Here's a snap I have on my computer

I do not know who made the picture; of course I will acknowledge the author if possible.

7N7

analog_sa · 13th November 2007, 01:14 PM

Quote:

Originally posted by the_manta
866 and 3B28 are electrically the same, but 866 uses mercury whereas 3B28 uses Xenon gas.

Xenon rectifiers don't sound good at all to my ears. Purple glow?! The only reason some of us suffer with mercury is the sound.

HollowState · 13th November 2007, 04:36 PM

Carl said:

Quote:

Mercury...bad stuff even if you like the blue color. I'm intrigued by the 3b28 xenon version though. Few environmental side effects that I can find, basically inert, but I have read about its use for generating ultraviolet light. Anyone know anything about these tubes? Any concern re: UV light?

It is my understanding, from what I have read, is that detrimental short wavelength UV is stopped by the glass.

Victor

12th November 2007, 03:38 PM	#1
x84andrea diyAudio Member Join Date: Jan 2005 Location: Roma	mercury vapor... i love it!!! hi friends, I wanted to have a little more information about these tubes, i want to build a SE with the gm70 or 100th, and i need of an high voltage rectifier, I love the blue light of these tube! i don't have problems to get large capacitors, this is a problem for the tube rectifier, true? It's better for you a CLC with a biginductanze or a CLC with a little inductanze but big capacitors? and What is for you a valve with a beautiful light? and do you have photos of these tubes in operation? 866a or 3b28 are good? or is little for my amp? I have see a 872a, it's good for me? thanks andrea __________________ aleph 5 aleph 2 a liquido in costruzione

12th November 2007, 03:47 PM	#2
Gluca diyAudio Member Join Date: Nov 2004 Location: Italy	MUHAHAHA Do you mean something like this? Here is my 100TH CCS loaded (DN2540 cascode) into a parafeed GM70. Nice tubes. Lovely sound. I am planning to build a preamplifier with those 100THs. OH! Mercury rectifers DONT like cap input filters. What you need are chokes. 3B28 does not have that blue glow but you dont need to warm the filaments up. 872A is way too big. Ciao Gianluca

13th November 2007, 07:25 AM	#6
x84andrea diyAudio Member Join Date: Jan 2005 Location: Roma	only 866a? the 3b28 is good for me, it have 500ma and 1-2second to start, but i have a gm70 for the final, it need time to heat up... there are annother tube with more light of a 866 and more current? __________________ aleph 5 aleph 2 a liquido in costruzione

13th November 2007, 11:10 AM	#8
7N7 diyAudio Member Join Date: Jan 2003 Location: "La France Profonde"	Here's a snap I have on my computer I do not know who made the picture; of course I will acknowledge the author if possible. 7N7 __________________ Plug them in and light them up

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12th November 2007, 03:51 PM	#3
the_manta diyAudio Member Join Date: Nov 2006	866 and 3B28 are electrically the same, but 866 uses mercury whereas 3B28 uses Xenon gas. This also means that the 3B28 only needs to heat up a few seconds and not a half minute like the mercury vapor rectifiers. On the other hand it is said that the gas rectifiers produce more HF noise. Personally I like the 3B28 very much, because of the violet purple glow. I always heat them up with a cheap SNT, actually designed for 12V halogen spots. You will only need two windings for the 2,5V. Regards, Simon

13th November 2007, 02:55 AM	#4
GaryW diyAudio Member Join Date: Feb 2003 Location: University Place, WA	I have a 300B PP amp with a pair of 866As. I did have 83's but like the glow of and availability the 866's more. Here's a picture with the 83's....

13th November 2007, 04:25 AM	#5
Carlp diyAudio Member Join Date: May 2006	Mercury...bad stuff even if you like the blue color. I'm intrigued by the 3b28 xenon version though. Few environmental side effects that I can find, basically inert, but I have read about its use for generating ultraviolet light. Anyone know anything about these tubes? Any concern re: UV light? Carl

13th November 2007, 10:56 AM	#7
Gluca diyAudio Member Join Date: Nov 2004 Location: Italy	EIMAC RX21

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