opt question - 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 22nd June 2005, 03:30 AM   #1
diyAudio Member
 
Join Date: Jan 2004
Location: malaysia
Default opt question

Hi guys,

My trans is specified is to be used at 35-50mA. However, currently I am running it at much higher current (60-70). Does this have effect on the trans?
I dont know if it saturates or not, but so far it sounds fine. And the voltages measures ok, the trans does not get hot. Is this ok?
  Reply With Quote
Old 22nd June 2005, 05:07 AM   #2
diyAudio Member
 
Geek's Avatar
 
Join Date: Sep 2004
SE?

Could lead to shorter life and reduced bottom end. Unless it's a decent product, which then are conservatively rated anyway...

What brand?
  Reply With Quote
Old 22nd June 2005, 05:59 AM   #3
diyAudio Member
 
Join Date: Jan 2004
Location: malaysia
Hi!

Ya, it is SE, 5k trans. I am using it for 2a3, which I think it looks good on paper.
Shorter life you mean for the tubes?

thanks
  Reply With Quote
Old 22nd June 2005, 11:49 AM   #4
SHiFTY is offline SHiFTY  New Zealand
diyAudio Member
 
SHiFTY's Avatar
 
Join Date: Jul 2002
Location: New Zealand
Should be fine, I would guess. The core might be saturating a little, but I would guess you would really notice if it was too bad- core saturation gives some naaaasty distortion. However seeing that a 2A3 only puts out a couple of watts anyway, shouldn't be a problem. You might not get great bass response though, if its on the edge of saturation.

I use some SE transformers designed for EL84 in my 2A3 amp, and no problems thus far. The manufacturer probably put a little bit of extra current capacity,

I can't imagine how it would shorten the life of the tubes or transformers- generally transformers either work fine or not at all.

If you were really worried, whack a bigger cathode resistor in the power tube to lower the current a bit.
  Reply With Quote
Old 22nd June 2005, 01:28 PM   #5
diyAudio Member
 
Join Date: Jun 2005
Location: KL
I think it sould be no problem if the transformer doesn't get too hot. Some trans manufacturer will reserve a little extra current for safety purposes.
  Reply With Quote
Old 22nd June 2005, 01:51 PM   #6
diyAudio Member
 
Join Date: Jan 2004
Location: malaysia
ok, thanks guys

I surely didnt notice distortion (at reasonable volume) nor heat issues. Bass is not very deep, but I think I can live with it for the moment. Might whack a bigger resistor for fun of it.

5k looks good for 2a3 on paper anyway :-)
  Reply With Quote
Old 23rd June 2005, 06:36 AM   #7
diyAudio Member
 
Join Date: Jun 2005
Location: boston
A fully loaded transformer tends to give better regulation any ways. That is, the output voltage will be more resistant to change if the input voltage changes breifly and slightly

Most transformers have very genourous overload ratings. On the order of 200% for 30 seconds. However, I am sure there is a duty cycle associated with this

Unless something went haywire with your grid, I don't think you will have an issue
  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
newbie with input tran. question and wiring question imo Solid State 0 18th January 2006 10:10 PM
Capacitor Question /question on cap TunaFish Tubes / Valves 14 12th January 2004 02:23 AM
PS question - tformer question actually breguetphile Chip Amps 2 30th May 2003 01:29 PM
old speaker question, bullet midrange question & link to speaker project wallijonn Multi-Way 10 5th November 2002 06:03 AM


New To Site? Need Help?

All times are GMT. The time now is 11:43 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