raysolinski

API 2503 transformer question...
« on: October 07, 2008, 11:07:25 AM »
I see different sources and schematics that show 2 different things...the brown wire on the primary side as high...and some have it as  low? I have always gone with brown being low (-) and red being high (+)....anybody have a thought or confirmation on this? I am racking up all my 312's into one rack and want the phase to be right..and consistent :)....

Thanks,
Ray
"orange whip?..orange whip?...3 orange whips please"


ruairioflaherty

API 2503 transformer question...
« Reply #1 on: October 07, 2008, 11:37:04 AM »
Hey Ray,

go here http://www.danalexanderaudio.com/api.html

Get the PDFs "Transformers #1 and #2"

They have the hookup phase info

Cheers,
Ruairi

CJ

API 2503 transformer question...
« Reply #2 on: October 08, 2008, 03:52:51 AM »
just a side note, all the windings are the same, so all you need is S and F.
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

raysolinski

API 2503 transformer question...
« Reply #3 on: October 08, 2008, 08:00:31 AM »
Thanks guys...I knew it was quad filiar and identical....I understand the phasing now..what I can't wrap my brain around is the two different hook up schemes...the 325 uses it "as advertised" with the brown as the + while the 312 uses the red (?)..the use the same opamp. Is there something I am missing about the 312 that makes it invert the phase somewhere? I have 325 cards that I use as mic pre's so I will run it that way...but still would like to understand the 312 circuit...

Cheers,
Ray
"orange whip?..orange whip?...3 orange whips please"


 

Related Topics

  Subject / Started by Replies Last post
28 Replies
4554 Views
Last post March 27, 2013, 01:32:25 AM
by abbey road d enfer
18 Replies
1427 Views
Last post September 28, 2018, 12:14:47 PM
by Moby
23 Replies
2174 Views
Last post July 06, 2019, 04:36:08 AM
by abbey road d enfer
0 Replies
299 Views
Last post June 17, 2019, 09:25:35 AM
by gyraf