Transformer for a tube amp 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 21st March 2004, 07:53 PM   #1
diyAudio Member
 
A3rd.Zero's Avatar
 
Join Date: Nov 2003
Location: Los Angeles
Default Transformer for a tube amp question

I am using a Hammond 261c6 power transformer for my tube pre amp and I only need 110v out of it (it is a 220V centertapped). If I just use the centertap and one end of the winding can I clip the other end of the winding short and just tape it?

Primary 1___.......___+110V
.................) || (
.................) || (___ 0V
.................) || (
Primary 2___) || (____-110V

Thanks for the help.

Milo

edit: formatting
  Reply With Quote
Old 21st March 2004, 08:41 PM   #2
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Yes.

What is it you're trying to do? Maybe there's a better approach.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 21st March 2004, 08:51 PM   #3
diyAudio Member
 
A3rd.Zero's Avatar
 
Join Date: Nov 2003
Location: Los Angeles
The tube pre amp that I am building is much like the Morgan Jones one over on Headwize, except it uses a 12au7 and two 6Dj8's insted of three 6dj8's. In the power supply section of the schematic it calls for a 110V secondary winding and a 6.3V secondary winding. The transformer that I have on hand is the 261c6 which is setup to give 220V but I though that because of the center tap I could use it for the 110V required by the schematic.

The Preamp is a clone of the Radii HAP-03 incase that helps. I could email you the schematic if you are interested.

Thanks for your help.


Milo
  Reply With Quote
Old 21st March 2004, 09:31 PM   #4
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Yes, I'd like to see a schematic. Thanks!
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 21st March 2004, 09:46 PM   #5
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
mebbe is better solution to use both halves ?
CT to ground,and wo diodes (one per half) to + output-just like good ole vacuum rectifier?
in that case your tranny will run colder
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 21st March 2004, 10:51 PM   #6
stormy is offline stormy  United Kingdom
diyAudio Member
 
Join Date: Mar 2004
Location: Scotland
Quote:
Originally posted by choky
mebbe is better solution to use both halves ?
CT to ground,and wo diodes (one per half) to + output-just like good ole vacuum rectifier?
in that case your tranny will run colder

I agree with this

better not to leave floating windings
  Reply With Quote
Old 22nd March 2004, 05:46 AM   #7
SHiFTY is offline SHiFTY  New Zealand
diyAudio Member
 
SHiFTY's Avatar
 
Join Date: Jul 2002
Location: New Zealand
Yes, you should use a full wave rectifier, then you only need 2 diodes! Less sand in your system!
  Reply With Quote
Old 22nd March 2004, 02:37 PM   #8
diyAudio Member
 
A3rd.Zero's Avatar
 
Join Date: Nov 2003
Location: Los Angeles
Ok, here is the schematic. I know that there are better ways to do this but Im trying to stay as close to "cloning" the amp as possible. I plan to use 4 FREDS for the fullwave rectifier, each is rated to 12A and 1200V so even if I parallel the winding I won't be heating up the FREDS. Is there a problem with supplying twice the amperage to the amp, or will it only draw what it needs anyway?

Thanks for your help guys.

Milo

edit: spelling
  Reply With Quote
Old 22nd March 2004, 02:39 PM   #9
diyAudio Member
 
A3rd.Zero's Avatar
 
Join Date: Nov 2003
Location: Los Angeles
oops, here it is.

Click the image to open in full size.

Milo
  Reply With Quote
Old 22nd March 2004, 02:57 PM   #10
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

That looks alot like a headphone amp I've seen on Headwize.
Runeight, was that yours?

An anode follower DC coupled into a WCF, nice.

It's very easy to add a bigger cap on the output and a jack so you'll be driving your cans with it as well.

Here's something similar I toyed with a while ago:

Cheers,
Attached Images
File Type: gif 6n1p_srpp_wcf.gif (7.9 KB, 383 views)
__________________
Frank
  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
TL494 transformer less ps for tube amp tstt9000 Power Supplies 1 3rd August 2007 06:27 PM
question about multiple input transformer in same tube mic pre. limey222 Tubes / Valves 0 12th January 2007 12:15 AM
Tube audio transformer audioPT Tubes / Valves 19 21st March 2005 01:09 PM
toroid Transformer as power Transformer for tube tone Tubes / Valves 7 11th February 2003 08:57 AM
toroid Transformer as output Transformer for tube preamp? tone Tubes / Valves 15 2nd February 2003 04:36 AM


New To Site? Need Help?

All times are GMT. The time now is 04:41 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