Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th June 2009, 09:47 AM   #1
diyAudio Member
 
Join Date: Apr 2008
Default Any 9- pin rectifier tubes with separate cathodes?

Are there any rectifier tubes in noval base with separate cathodes? Even individual diodes would work. I'm going to build a full-wave vaccuum rectified psu, and was looking for tubes suitable for this use.
  Reply With Quote
Old 19th June 2009, 10:01 AM   #2
Arnulf is offline Arnulf  Europe
diyAudio Member
 
Join Date: Feb 2009
You don't need separate cathodes for FW rectifier unless your transformer lacks central tap. Normal FW rectifiers such as EZ80/81 have common cathode and two separate anodes which connect to both ends of the secondary while cathode connects to CT.

But if you insist, there are quite some diodes avaliable in noval version with top caps (check out EY8x/PY8x types).
  Reply With Quote
Old 19th June 2009, 11:03 AM   #3
diyAudio Member
 
Join Date: Jul 2003
Location: Ann Arbor, MI
hey-Hey!!!,
WE 412 has two independant diodes. As pointed out, a single cathode is fine; consider the octal directly heated types like 5U4...no separating that cathode between two diodes. In any case, with your full wave( or even a hybrid bridge ), the tube diodes are fine sharing the cathode...look at the schematic; even with SS the banded end are together at the positive output.
cheers,
Douglas
__________________
the Tnuctipun will return
  Reply With Quote
Old 19th June 2009, 11:47 AM   #4
diyAudio Member
 
Join Date: Sep 2002
Location: Memphis, TN
Hi,

Hope I understand your question correctly, have a look at the 6CA4/EZ81.

Regards,
ck
  Reply With Quote
Old 19th June 2009, 12:26 PM   #5
diyAudio Member
 
Tom Bavis's Avatar
 
Join Date: Jun 2002
Location: Macedon NY
A quick look at the tube data at NJ7P 's site shows 6853, 12DF5, 26Z5. For the last one, you'll have to fight the radio collectors, as it's used in the military R-390 receiver. If you can use an octal, the obvious choice is 6BY5 - cheap and plentiful.
  Reply With Quote
Old 19th June 2009, 12:52 PM   #6
diyAudio Member
 
Join Date: Jul 2003
Location: Ann Arbor, MI
hey-Hey!!!,
The Bendix Hy-G-300 series also has a 412 equivalent, type 6754. True +30 second warm-up to conduction time, and not too damn expensive. Given the use, I'd go with 6CA4/EZ81, as I don't think individual cathodes are really needed for the full wave, grounded CT operation.
cheers,
Douglas
__________________
the Tnuctipun will return
  Reply With Quote
Old 19th June 2009, 03:58 PM   #7
diyAudio Member
 
Join Date: Apr 2008
This would be for a 280vac 2A transformer without a center tap, but it has two 6.3v 3A, and one 12.6v 1.5A winding. It's an older custom job that was given to me. I'd like to stick with noval, as it's for an el84 design, and I have plenty of the proper sockets. The 6754 and 26z5 look promising, and not terribly expensive for the 26z5. Any places online that carry the 6754? AES only shows a cross reference.
  Reply With Quote
Old 19th June 2009, 04:04 PM   #8
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
A noval rectifier for 560 VA?
__________________
If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.
  Reply With Quote
Old 19th June 2009, 04:21 PM   #9
diyAudio Member
 
Join Date: Apr 2008
Steady state current will maybe be around 425mA. It's for an AB1 push-pull el84 design with ecc82 concertina phase splitter. Basically like a bevois valley.
  Reply With Quote
Old 19th June 2009, 04:57 PM   #10
diyAudio Member
 
Join Date: Jul 2003
Location: Ann Arbor, MI
Quote:
Originally posted by Lingwendil
This would be for a 280vac 2A transformer without a center tap, but it has two 6.3v 3A, and one 12.6v 1.5A winding. It's an older custom job that was given to me. I'd like to stick with noval, as it's for an el84 design, and I have plenty of the proper sockets. The 6754 and 26z5 look promising, and not terribly expensive for the 26z5. Any places online that carry the 6754? AES only shows a cross reference.

You'll need two SS diodes to complete the bridge; 5A/600V Cree SiC Schottky types would be at the top of my list for this app...and it would allow the use of the 6CA4, a high performance IDH twin diode rectifier.

I've found it easier to source the WE 412 than the 6754.
cheers,
Douglas
__________________
the Tnuctipun will return
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
WTT: Various tubes for 6CA4/EZ81 rectifier tubes GordonW Swap Meet 4 27th August 2008 12:37 AM
Rectifier Tubes denny9167 Tubes / Valves 10 21st April 2008 06:12 PM
Tubes Rectifier Help? papanohn Tubes / Valves 3 23rd July 2007 05:05 AM
Why separate AC heater supplies for driver and power tubes? leadbelly Tubes / Valves 3 5th March 2006 12:34 PM
Rectifier tubes yuval Tubes / Valves 8 14th June 2003 06:40 AM


New To Site? Need Help?

All times are GMT. The time now is 09:54 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2