Edcor Universal Power Transformer for Tubelab SE - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Tubelab

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Reply
 
Thread Tools Search this Thread
Old 20th March 2009, 08:35 PM   #1
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
Default Edcor Universal Power Transformer for Tubelab SE

I am having Edcor build a power transformer for the Tubelab SE. They don't currently have one with the correct HT winding that also has a CT 6.3V winding and a 5V @3A winding (I want the option to use a 5U4*).

I am adding a pair of taps to the HT winding that will allow me to run either around 300V or 400V B+ so that the amp will take full advantage of 45s or 300Bs. Since the input stage uses a CCS, it seems like being able to switch back and forth when switching tubes should work fine with an amp like this. Obviously, making this an actual switch falls under the same category of "oops" as putting a switch on the heater supply, but that is always an option.

Here are the specs:

330-260-0-260-330 @ 175mA
6.3V CT @ 3A
5V @ 3A

They quoted me $57.98 (plus the setup fee for me), which seems fairly reasonable. Is anyone else interested in a design like this? Obviously, you still have to compromise on the OPT impedance, but I don't mind losing a little power with 300Bs seeing 5k.

I'm done with Hammond.

Russ
  Reply With Quote
Old 20th March 2009, 09:05 PM   #2
diyAudio Member
 
Join Date: Nov 2007
Location: Dallas
The only trouble with Edcor customs is knowing which ones
they allready got designed? Without calling to ask I mean...

I'm certain that many here appreciate the heads up, that
this especially useful custom design is now on the books.
  Reply With Quote
Old 20th March 2009, 09:17 PM   #3
chrish is offline chrish  Australia
diyAudio Member
 
chrish's Avatar
 
Join Date: Oct 2003
Location: Sydney
I don't have the link on this computer, but if you go to the forums on the Edcor site there is a link to a PDF or .doc file that lists all of the power transformers that they have designs for.

Chris
  Reply With Quote
Old 20th March 2009, 09:21 PM   #4
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
Yes, I have the PDF and they had some that could be made to work, but I couldn't find anything with the right HT, CT heaters, and 5V @ 3A. After talking to them, they said they didn't have anything quite like it. Adding the taps is a bonus to make up for the $40 setup fee.

Russ
  Reply With Quote
Old 23rd March 2009, 04:51 PM   #5
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
OK, so over in my SSE thread Even Harmonics and George pointed-out that I probably need 4A on the 6.3V winding to run 300Bs. I could go 5A to cover mega-crazy 300Bs, but I don't think that is in the cards for me.

Any other suggestions?
  Reply With Quote
Old 24th March 2009, 11:08 PM   #6
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
I talked to Edcor today and ordered the transformer. Here are the final numbers. I haven't received the invoice yet, but it should be the same. I'll update if it changed.

XPWR132 - $61.89
330-260-0-260-330 @ 175mA
6.3 V CT @ 4A
5V @ 3A

They are busy, so it will take about 3 weeks.

Russ
  Reply With Quote
Old 25th March 2009, 03:19 PM   #7
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
I got the sales order today. Should take 3-4 weeks. Note the new part number is:

XPWR131

It is wrong in the post above! If you order one I would double-check the specs with them because they gave me the other part number over the phone yesterday.

FYI, bumping the 6.3 to 4A only added $4 to the cost. To go to 6A to try to cover 2A3s and some of the $beaucoup 300Bs would have required a larger bobbin and a bigger core, so the cost would have gone up more significantly. She said it would be "doable" on a single transformer, though.

I figured that the majority of folks that would want to build a "more universal" Tubelab SE using one of these would probably be looking at more of the reasonably-priced 300Bs.
  Reply With Quote
Old 26th March 2009, 02:19 AM   #8
diyAudio Member
 
SpreadSpectrum's Avatar
 
Join Date: Nov 2007
Just last week I got XPWR099 assigned to me. I wondered where they were going to go with the numbers from there.
  Reply With Quote
Old 26th March 2009, 06:18 AM   #9
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Today I've discovered a weak point of an Edcor transformer...
Attached Images
File Type: jpg wavebourn5-sm.jpg (37.0 KB, 1387 views)
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 10th April 2009, 08:20 PM   #10
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
I just got the notification that the transformer has shipped. I'll post test results once it gets here.

Good timing too, as a friend of mine has loaned be a pair of Chinese 300BS tubes (the crazy globe ones with mesh screens) to try. He's got WEs now.... Prolly gonna pick up a pair of the "cheap" Shuguang 300B-98s before they go up in price more.

Russ
  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
Tubelab SE - alternate power transformer Evenharmonics Tubelab 22 14th June 2010 01:17 AM
Tubelab SimpleSE: Edcor XSE15-8-5K or XSE25-16-7.6K? pukka Tubelab 50 21st April 2009 08:13 AM
tubelab SE 300b power transformer Dhoff Tubes / Valves 27 14th March 2008 05:56 PM
Tubelab Simple SE & Edcor waam68 Tubes / Valves 2 6th March 2008 01:15 PM
Edcor Power Transformer rudy129 Swap Meet 0 5th December 2007 02:49 PM


New To Site? Need Help?

All times are GMT. The time now is 12:27 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