Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

James Transformers
James Transformers
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
Thread Tools Search this Thread
Old 21st October 2007, 03:47 AM   #1
Andersen is offline Andersen  Viet Nam
diyAudio Member
Join Date: Apr 2007
Default James Transformers

Can you all please instruct me how to connect the pins of James Interstage Transformer JS-2009N. Please help me. Thanks a lot.
  Reply With Quote
Old 21st October 2007, 05:42 AM   #2
lochness is offline lochness  United States
diyAudio Member
Join Date: Dec 2006
are the pins labled at all? Are you working from a schematic? Did it come with any papers or instructions?

also how manny pins are there?

I did a quick google search and didn't find much.
  Reply With Quote
Old 21st October 2007, 11:22 AM   #3
Dave Cigna is offline Dave Cigna  United States
diyAudio Member
Dave Cigna's Avatar
Join Date: Oct 2003
Location: Finger Lakes, NY
According to a google search it's a phase splitting transformer.

Use your DMM to measure the resistance between all the pins. The primary will be two pins connected together but to none of the other pins. The secondary will be three pins. Which one is the center tap should be obvious from the resistance measurements. If there's another pin that doesn't appear to be connected to anything then it's probably an electrostatic shield and should be grounded.

Then the only remaining question is which way to hook up the primary. One pin goes to the power supply and one to the plate. It might not matter which way you do it, but one connection might provide better high frequency response. You could just try it both ways and listen....

If you have a signal generator and a scope then you can try driving the primary with a square wave and looking at the secondary. The ground leads on both your signal generator and scope will almost certainly be connected together through the power cords, so keep them straight. Connect the generator ground to one pin of the primary and the hot lead to the other through a 5k resistor. On the secondary side connect the scope probe ground clip to the CT and the probe itself to either end of the secondary. It will probably help to connect the two grounds together with a clip lead.

Set your signal generator to produce a 10kHz square wave, crank up the amplitude and see what you get on the scope. Switch the connections on the primary side to see if it looks different. Obviously, you'll want to look at both ends of the secondary, but you want to decide which primary connection results in the cleanest square wave on the secondary. Once you've figured that out, the pin you have grounded on the primary is the one you want to connect to the power supply in your amp.

As I said, if you don't have a signal generator and scope, then you can just try it both ways and listen.

-- Dave
January 20, 2009: Bush's last day
  Reply With Quote


James TransformersHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
A New Source for James Transformers dsavitsk Tubes / Valves 2 6th April 2009 08:16 PM
Sources for James Transformers boywonder Tubes / Valves 10 14th November 2008 03:25 PM
WTB - James 6123HS Transformers... Guiness Swap Meet 0 10th June 2008 10:44 PM
james transformers billr Tubes / Valves 6 10th May 2005 11:17 AM
James and other transformers - CE status ashok Parts 3 4th August 2004 02:56 AM

New To Site? Need Help?

All times are GMT. The time now is 10:21 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio