rectifier into 5U4?

Author Topic: rectifier into 5U4? (Read 74411 times)

Lindsay Mannix	Re: rectifier into 5U4? « Reply #100 on: 2010-06-24, 00:24:24 »
Jr. Member Posts: 77	Tube noise ...or lack thereof? http://www.john-a-harper.com/tubes201/#Noise

the_big_m_in_ok

Re: rectifier into 5U4? « Reply #101 on: 2010-06-24, 01:23:59 »

Sr. Member

Posts: 480

Quote from: ION on 2010-06-20, 02:48:23

Hi Lindsay

I for one will keep collecting and building with tubes. Recently bought a batch of several hundred at an auction for $5. Included 5U4's and some 6BQ7's, lots of other power tubes. My collection is in the thousands.

I'm gonna dig up that 885 gas tube and build the Fairbairn oscillator just for old times sake. I found the Fairbairn patent.....1952. Here it is:
(attachment: "pat2607897.pdf")

The attachment wouldn't run on the borrowed computer I was using. This file would run:

http://www.google.com/patents?id=pD9WAAAAEBAJ&pg=PA1&dq=patent:2607897&as_drrb_ap=q&as_minm_ap=0&as_miny_ap=&as_maxm_ap=0&as_maxy_ap=&as_drrb_is=q&as_minm_is=0&as_miny_is=&as_maxm_is=0&as_maxy_is=&source=gbs_selected_pages&cad=1#v=onepage&q&f=false

--Lee

« Last Edit: 2010-07-14, 22:18:28 by the_big_m_in_ok »

Grumpy	Re: rectifier into 5U4? « Reply #102 on: 2010-06-24, 03:54:55 »
Group: Tinkerer Hero Member Posts: 4265 tExB=qr	full spectrum noise looks like a dc bias edit: you can get Vaccum Tubes by Spangenberg here or on a CD via Ebay http://ken-gilbert.com/techstuff/spang/Spangenberg.html

darkspeed	Re: rectifier into 5U4? « Reply #103 on: 2010-06-25, 17:38:24 »
Hero Member Posts: 812	http://www.diyaudio.com/forums/tubes-valves/108768-hybrid-power-supply-diode-bridge-into-diode-tube.html http://www.freewebs.com/valvewizard/bridge.html http://www.emissionlabs.com/datasheets/EML5U4G.htm « Last Edit: 2010-06-26, 00:50:29 by darkspeed »

Grumpy	Re: rectifier into 5U4? « Reply #104 on: 2010-06-27, 01:36:51 »
Group: Tinkerer Hero Member Posts: 4265 tExB=qr	I almost forgot: full spectrum noise is synonymous with certain forms of radiation and radiation-like phenomena... hint hint

BEP	Re: rectifier into 5U4? « Reply #105 on: 2010-06-27, 12:15:37 »
Hero Member Posts: 2205	Does anybody have verifiable information on what the 'B' means in 5U4GB ? I know there are differences between the 5U4G and 5U4GB. Not enough to worry about when cross referencing for most applications but, the RCA flavor of the 5U4GB may have some less common heater properties. The other differences have proven enough for me to not waste time on a 5U4G.

poynt99

Re: rectifier into 5U4? « Reply #106 on: 2010-06-27, 13:58:48 »

Group: Administrator
Hero Member

Posts: 3538
It's not as complicated as it may seem...

The only difference I could see noted in the RCA RC-21 spec book was that the two use different outlines. They only give the specs for the GB version in the book.

.99

---------------------------

"Some scientists claim that hydrogen, because it is so plentiful, is the basic building block of the universe. I dispute that. I say there is more stupidity than hydrogen, and that is the basic building block of the universe." Frank Zappa

darkspeed	Re: rectifier into 5U4? « Reply #107 on: 2010-06-27, 18:00:31 »
Hero Member Posts: 812	The 5U4G is a coke bottle tube - the other just a straight tube 5U4GB is lower internal resistance and higher peak current Up to 5v and 50ma difference depending who made it In audio terms the 5U4G is tighter than the 5U4GB - once again depending on who made it

BEP

Re: rectifier into 5U4? « Reply #108 on: 2010-06-28, 01:48:17 »

Hero Member

Posts: 2205

Quote from: darkspeed on 2010-06-27, 18:00:31

The 5U4G is a coke bottle tube - the other just a straight tube

5U4GB is lower internal resistance and higher peak current

Up to 5v and 50ma difference depending who made it

In audio terms the 5U4G is tighter than the 5U4GB - once again depending on who made it

Tighter? As in 'lower head room'? I used to know all those terms but my hearing went South a couple of decades ago.

I guess I'm looking for details not usually supplied. I have mil-spec manuals referring to requirements of thoriated tungsten direct heaters. I've never heard of thoriated tungsten on the heater, just the cathode sheath.

Once upon a time you could tell the heater makeup by the color at rated voltage. Dull to mid-bright red meant thoriated tungsten. Mid-orange to bright orange meant tantalum oxide on tungsten, etc.
I have one RCA with very little use. The heater is a dull red at 5V 3A.

darkspeed	Re: rectifier into 5U4? « Reply #109 on: 2010-06-28, 04:55:41 »
Hero Member Posts: 812	Sorry I was vague.. the audio guys have the opinion that the 5U4G is better at enabling a well built tube amp to reproduce high frequency signal. How they tell that I have no idea.. its all sugar pills to me.. http://www.nj7p.org/Tube4.php?tube=5U4G http://www.r-type.org/pdfs/5u4g.pdf http://www.r-type.org/pdfs/5u4gb.pdf