NOS potted Chicago Transformer 1BC-150 - 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 26th July 2012, 06:33 PM   #1
yero is online now yero  United States
diyAudio Member
 
Join Date: Mar 2010
Location: Medina, N.Y. near Rochester N.Y.
Default NOS potted Chicago Transformer 1BC-150

Can anyone provide a link that explains how I can combine the secondary voltages to produce the maxium output voltage. The secondaries are 125V,100v,75v and 50v. It says 150ma which I believe implies 150ma for each secondary. The box also says output volts from condenser input filter using 5u4 tube. the secondary also has 5v at 3A. for the rectifer tube. Is it possible to connect together the secondaries to produce 300-350volts. If not connected in phase, will the voltages subtract? How is phase determined, trial and error?
  Reply With Quote
Old 26th July 2012, 06:44 PM   #2
yero is online now yero  United States
diyAudio Member
 
Join Date: Mar 2010
Location: Medina, N.Y. near Rochester N.Y.
Sorry,The potted Chicago transformer model # is 1BS-150 with 13 bottom lugs
  Reply With Quote
Old 26th July 2012, 10:53 PM   #3
7N7 is offline 7N7  United Kingdom
diyAudio Member
 
7N7's Avatar
 
Join Date: Jan 2003
Location: England
Of course I have no idea of the size of the transformer, but I should think that the rating of 150mA applies to the secondary in total.

The best way to determine phase is to use an oscilloscope. Failing that (and what I have done recently) is to connect the secondaries and connect the output to a fast-acting meter. If the voltage drops then it's out of phase; left powered the transformer will get very hot indeed. Normally with such transformers there are taps for the various voltages and a single 0v terminal.

7N7
__________________
Plug them in and light them up
  Reply With Quote
Old 27th July 2012, 02:07 AM   #4
yero is online now yero  United States
diyAudio Member
 
Join Date: Mar 2010
Location: Medina, N.Y. near Rochester N.Y.
Thanks 7n7. Can't exactly follow your explanation. the transformer's dimensions are 4 in. H. X 3 1/4 W. X 3 in. wide and weighs 5 pounds. I have located the catalog but can not find the pin out. What is the 0v terminal for? Does the size and weight help determine what the current rating is for the transformer at 350volts. I do not have an oscilloscope yet. I would like to use this transformer for a push pull EL84 AMP. Any help from anyone is greatly appreciated. Yero
  Reply With Quote
Old 27th July 2012, 05:33 AM   #5
yero is online now yero  United States
diyAudio Member
 
Join Date: Mar 2010
Location: Medina, N.Y. near Rochester N.Y.
When 7n7 talks about connecting the secondaries and connect the output to a fast acting meter, do I connect the secondaries in series or parallel to obtain max. voltage at 150ma. does fast meter imply some thing like a fluke 87, I only have a 77- but can't an analog meter work good for this application. I can imidately recieve an indication of up or down in voltage using stand alone voltage meter with manual range voltage adjustment taps Analog meters, which I have access to. Is this what is ment by fast-acting meter? all assistance is appreciated. Yero
  Reply With Quote
Old 27th July 2012, 07:51 AM   #6
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
Quote:
Originally Posted by yero View Post
Can anyone provide a link that explains how I can combine the secondary voltages to produce the maxium output voltage. The secondaries are 125V,100v,75v and 50v. It says 150ma which I believe implies 150ma for each secondary. The box also says output volts from condenser input filter using 5u4 tube. the secondary also has 5v at 3A. for the rectifer tube. Is it possible to connect together the secondaries to produce 300-350volts. If not connected in phase, will the voltages subtract? How is phase determined, trial and error?
first you have to find out if the secondaries are separate windings or just a continuous winding with several taps...you need a dmm set to ohms to do this...the terminal marked 0 is usually the starting point to measure all other voltages...
  Reply With Quote
Old 27th July 2012, 09:37 AM   #7
7N7 is offline 7N7  United Kingdom
diyAudio Member
 
7N7's Avatar
 
Join Date: Jan 2003
Location: England
Your meter will be fine and as Tony says it's a good idea to establish whether or not the secondaries are one continuous winding or separate ones, If this is the case of course you will have a 0v terminal and one each for 50v, 75v 100v and 125v. If the windings are separate, then there will be two terminals for each voltage.

7M7
__________________
Plug them in and light them up
  Reply With Quote
Old 27th July 2012, 09:47 AM   #8
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
a picture showing nameplate data or pin arrangements will definitely help....
  Reply With Quote
Old 27th July 2012, 06:22 PM   #9
diyAudio Member
 
Join Date: Dec 2003
Location: near ST. Louis MO.
looks like you have a bias trasformer with contunious windings .
http://www.bunkerofdoom.com/xfm/chicago1953/005.jpg
__________________
To be better one must be different ,but to be different is not necessarily better .
  Reply With Quote
Old 27th July 2012, 07:04 PM   #10
yero is online now yero  United States
diyAudio Member
 
Join Date: Mar 2010
Location: Medina, N.Y. near Rochester N.Y.
picture of transformer
Attached Images
File Type: jpg IMG_1073.jpg (767.9 KB, 107 views)
File Type: jpg IMG_1074.jpg (655.7 KB, 97 views)
File Type: jpg IMG_1075.jpg (612.0 KB, 96 views)
  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
Partidge output transformer, potted, fantastic bentoronto Swap Meet 3 2nd June 2010 11:43 AM
Heathkit potted power transformer question Boris_The_Blade Tubes / Valves 4 19th September 2007 03:29 AM
Potted Transformer Enclosure Suppliers? Yukonsc Tubes / Valves 3 1st December 2006 02:44 PM
custom transformer manufacturers (potted if possible) jarthel Tubes / Valves 11 5th June 2006 06:51 PM
suitability of this potted transformer for chipamp? jimbo1968 Parts 1 11th June 2005 03:27 PM


New To Site? Need Help?

All times are GMT. The time now is 03:04 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