Options for 300mA tube rectifiers - 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 25th February 2012, 10:41 AM   #1
diyAudio Member
 
Join Date: Sep 2003
Location: London
Default Options for 300mA tube rectifiers

It's always tricky to find tube rectifiers capable of 300mA at 350v to 400v for things like Push Pull amps.

I've had good results so far with two 6BY5, and about to try two 5R4GY. I've previously used damper diodes like 6DT4, but a pair are problematic around 250ma and over.

What are your solutions and experiences?

Andy
  Reply With Quote
Old 25th February 2012, 11:23 AM   #2
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
A GZ37 is good for 350 mA., into a choke I/P filter. Only 275 mA. are available from a GZ37, when cap. I/P filtration is employed.
__________________
Eli D.
  Reply With Quote
Old 25th February 2012, 01:23 PM   #3
diyAudio Member
 
Vinylsavor's Avatar
 
Join Date: Feb 2002
Location: Lindau
Hi Andy,

many choices among the TV dampers. Since each diode will only conduct half the time, the current drawn from a pair or a bridge can be twice the DC current capability of a single diode. I'd leave some margin however. A 6AU4 might just be enough.

300mA will be absolutely no problem for 6CJ3, EY500 or 6CG3:

VinylSavor: Tube of the Month: The 6CG3

Best regards

Thomas
__________________
http://vinylsavor.blogspot.com/
  Reply With Quote
Old 25th February 2012, 02:06 PM   #4
roline is offline roline  United States
diyAudio Member
 
roline's Avatar
 
Join Date: Sep 2010
Location: East Tennessee
I use solid state bridges with a 6CG3 as a "pass device" in the B+ to delay conduction to the rest of the amp to match the tubes as they warm up. First application was on the KEG-EAR ST70 clone application, worked great so I'm using it in all other power supplies.
Attached Images
File Type: jpg compactron3-3.jpg (745.5 KB, 159 views)
__________________
SO many tubes, SO little time!!!
  Reply With Quote
Old 25th February 2012, 02:11 PM   #5
diyAudio Member
 
Join Date: Apr 2009
PY500A is also very good for excellent price, if you can afford new transformer for heating ...
__________________
tubes.rs
  Reply With Quote
Old 25th February 2012, 02:18 PM   #6
diyAudio Member
 
Palustris's Avatar
 
Join Date: Aug 2006
Location: Cape Cod
The 5V3 and 5V3A should handle the current without a problem.
  Reply With Quote
Old 25th February 2012, 07:24 PM   #7
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
Quote:
A 6AU4 might just be enough.
I think a pair of 6AU4GTAs will be quite adequate in a 300 mA. PSU. A look at the data sheet shows a 190 mA. DC rating as a (sic) 1/2 wave rectifier. Damper diodes are built to take repeated large pulse draws. A "yank" 50 or 60 times a second rates to be a "piece of cake". The only thing to watch out for is an excessive turn on surge working into a cap. I/P filter. Don't be aggressive in sizing the 1st filter cap. and (of course) use a CLC filter.
__________________
Eli D.
  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
Tube Rectifiers do sound different Original Burnedfingers Tubes / Valves 122 27th April 2012 06:43 PM
Tube rectifiers razorrick1293 Tubes / Valves 14 11th July 2011 07:34 PM
Small (Novel) Tube Rectifiers? Kashmire Tubes / Valves 29 7th May 2010 03:27 AM
Tube rectifiers for Dummies bigjppop Tubes / Valves 8 17th July 2009 06:04 AM
Tube rectifiers NickC Tubes / Valves 32 7th November 2002 09:10 PM


New To Site? Need Help?

All times are GMT. The time now is 02:50 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