4v for rectifier tube - diyAudio
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 16th May 2008, 02:11 PM   #1
diyAudio Member
 
Join Date: Apr 2004
Location: pampanga
Default 4v for rectifier tube

a silly question: what will happen if i use a 4v supply for a 5v specified rectifier like a 5y3 or 5u4g tube?

larry
  Reply With Quote
Old 16th May 2008, 02:27 PM   #2
Sheldon is offline Sheldon  United States
diyAudio Member
 
Join Date: Dec 2003
Location: San Diego
You can probably get away with it, but only if you are drawing well under the maximum current for the tube.

Sheldon
  Reply With Quote
Old 16th May 2008, 02:47 PM   #3
diyAudio Member
 
Join Date: Apr 2004
Location: pampanga
Default 4v

thanks.
  Reply With Quote
Old 16th May 2008, 10:46 PM   #4
diyAudio Member
 
Miles Prower's Avatar
 
Join Date: May 2005
Location: USA
Blog Entries: 6
If you under power the filament of a power diode, you will lose Isurge capability, and increase Vf. It's not a good idea, especially if your design is bumping against the max ratings.

It'd be better to get a proper filament xfmr for the type.
__________________
There are no foxes in atheistholes
www.dolphin-hsl.com
  Reply With Quote
Old 16th May 2008, 11:07 PM   #5
diyAudio Member
 
sorenj07's Avatar
 
Join Date: May 2006
A small 5V 2A transformer (only 10VA) is worth it for a 5AR4/5Y3 type.
  Reply With Quote
Old 19th May 2008, 02:38 PM   #6
diyAudio Member
 
Join Date: Apr 2004
Location: pampanga
Default 4v

thank you guys. i better ask my winder for a new transformer.
  Reply With Quote
Old 19th May 2008, 02:51 PM   #7
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Default Re: 4v

Quote:
Originally posted by camotecue
thank you guys. i better ask my winder for a new transformer.
Or possibly use a 4V rectifier tube... (Some rare German and English types, look on eBay)
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 19th May 2008, 03:08 PM   #8
Sheldon is offline Sheldon  United States
diyAudio Member
 
Join Date: Dec 2003
Location: San Diego
Default Re: 4v

Quote:
Originally posted by camotecue
thank you guys. i better ask my winder for a new transformer.
If you are not pushing the rectifier to its current limits, don't worry, try it. Your 4V winding may give you something a little higher than 4V, and virtually all tube are rated at least +/_ 10%, so 4.5V on the filament would be within normal rating anyway. You don't have to try your best tube - 5U4G's are cheap and readily available.

Sheldon
  Reply With Quote
Old 19th May 2008, 07:22 PM   #9
diyAudio Member
 
Geek's Avatar
 
Join Date: Sep 2004
A pair of unloved 3V damper tubes with resistor in the heater would also work if you're concerned.

Cheers!
  Reply With Quote
Old 20th May 2008, 08:49 PM   #10
Klimon is offline Klimon  Belgium
diyAudio Member
 
Join Date: Apr 2005
Location: Leuven
Quote:
You don't have to try your best tube - 5U4G's are cheap and readily available.
Better not to use it; 5u4g has excessive heater current draw (3A vs. 2A for e.g. gz32 and gz34) which will further decrease your voltage under load.

Simon
  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
6X4 Tube rectifier. SINGLEENDED Tubes / Valves 13 20th March 2007 03:52 PM
Tube rectifier help Cobra2 Tubes / Valves 12 3rd March 2007 01:58 PM
Z2b tube rectifier bee696 Tubes / Valves 3 4th November 2006 02:45 PM
Anybody heard about Tarzian Silicon Rectifier for Tube Rectifier Replacement? zxx123 Tubes / Valves 4 21st February 2005 04:02 AM
Tube rectifier for VDIGC tube psu ebijma Chip Amps 2 11th March 2004 04:02 PM


New To Site? Need Help?

All times are GMT. The time now is 01:06 PM.


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