boji

Re: API 2503 transformer
« Reply #20 on: July 04, 2019, 08:09:12 AM »
So comon, iprovlek!   Lets see some more pr0n in action! 

« Last Edit: July 04, 2019, 09:29:23 PM by boji »


iprovlek

Re: API 2503 transformer
« Reply #21 on: July 04, 2019, 10:17:30 AM »
Be patient Boji....

CJ

Re: API 2503 transformer
« Reply #22 on: July 06, 2019, 04:17:58 AM »
if you use a twist drill, you can time the amount of time the drill runs at the same speed (why not flat out?) to give you the same twists per inch,

using twisted wire instead of quad means you will get the same results no matter which leads you use for color coded hookup wire,

with quad you might be using the two inner wires for pri, or two outer, or 1 and 3, get it?  capacitance might be a little \different between wires, not so with the twisted wire,

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

abbey road d enfer

Re: API 2503 transformer
« Reply #23 on: July 06, 2019, 04:36:08 AM »
if you use a twist drill, you can time the amount of time the drill runs at the same speed (why not flat out?) to give you the same twists per inch,
Considering the mean turn length of about 4 inches and the total wire length of about 200 ft, a good enough precision can be attained by just looking at the coiled wire.
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.

extrepito

Re: API 2503 transformer
« Reply #24 on: December 09, 2020, 12:19:02 PM »


Hi, I'm looking for information to build 2503 but the https://vacuumbrain.uk page is down. I guess this transformer is pretty straightforward, but I have some doubts. This will serve for the output of 554 Eq.
A greeting !




volker

Re: API 2503 transformer
« Reply #25 on: December 09, 2020, 06:14:39 PM »

Hi, I'm looking for information to build 2503 but the https://vacuumbrain.uk page is down. I guess this transformer is pretty straightforward, but I have some doubts. This will serve for the output of 554 Eq.
A greeting !
https://groupdiy.com/index.php?topic=74165.msg938988

iprovlek

Re: API 2503 transformer
« Reply #26 on: December 10, 2020, 03:43:14 AM »

Hi, I'm looking for information to build 2503 but the https://vacuumbrain.uk page is down. I guess this transformer is pretty straightforward, but I have some doubts. This will serve for the output of 554 Eq.
A greeting !

Yes 2503 will serve 554 eq....Volker put link where is CJ's API's transformers winding diagrams...

extrepito

Re: API 2503 transformer
« Reply #27 on: December 10, 2020, 04:48:55 AM »
Many thanks to Volker and Improvlek. Your response has been very fast.
A greeting!!

Aleguitarpro

Re: API 2503 transformer
« Reply #28 on: December 13, 2020, 03:29:13 AM »
Yes that is company that doing wires from 1939!!!

I asked for this particularly wire 4 twisted 0.28mm gauge wire!!!

Isn't that cheap wire but it worth it! Especial when you doing lot of them...


I didn't made any input trannie but that is My next wish!!!


You have recipe for input for API on CJ site that I sent you!!!

I did API 1604 inspired 16 channels mixer, lots of job,time,money and endless soldering...

So need it lot of trannies....

Congrats for the great work here.
Do you remember how many meters of twisted wire have you ordered to make 16 of them?
There's a calculated total length (straight and twisted) on the CJ receip but I'd like to have a confirm in European measure (meters).

Do you used this lams?

https://www.don-audio.com/Edcor-EI63-12-Strand-M-6-29-Gauge-0014-0355mm-line-grain-oriented-silicon-steel-lamination

If yes, with this pack/set of lams how many transformers can you make?

Many thanks

iprovlek

Re: API 2503 transformer
« Reply #29 on: December 13, 2020, 03:39:25 AM »
Hi Aleguitarpro!

I use 30m...for testing,but finished with buying Litz wire from PACK LITZ WIRE company!They have 0.28mm of

4 twisted wire!

Yes I use that lams from Edcor,you have on first site I told everything that I used...

It can be done about almost 20 pieces....

But next one batch of it I bought laminations from Italy!

Best
Ivan


Aleguitarpro

Re: API 2503 transformer
« Reply #30 on: December 13, 2020, 05:55:45 AM »
Hi Aleguitarpro!

I use 30m...for testing,but finished with buying Litz wire from PACK LITZ WIRE company!They have 0.28mm of

4 twisted wire!

Yes I use that lams from Edcor,you have on first site I told everything that I used...

It can be done about almost 20 pieces....

But next one batch of it I bought laminations from Italy!

Best
Ivan

Hi Ivan, thanks for your fast reply.
Yes, I mean how many meters of Litz 0.28mm of 4 twisted wires from PACK LITZ WIRE?
30 m?
Great to know that I can do about 20 transformers with edcor set.
I repaired several transformers but these API seems very easy to do, especially with an already twisted 4 wires.
I live in Italy.
You bought lams from Novarria elettronica, Milan?
Because I searched for a suitable type on their catalogue but I'm not sure about lams dimension I need to use from their website.
Thanks for help!

iprovlek

Re: API 2503 transformer
« Reply #31 on: December 14, 2020, 02:23:19 AM »
Aleguitarpro you need about 30m for one trannie...That CJ explained, you have that info on forum!

EI63(US) is practically EI48(EU)..... so you can go with EI48 for 2503 trannie without any doubts...to be correct EI625 is the US measure for lams of this trannie!


About winding, you can use 4 wire in same time for winding ,you get the same effect, and sound the same!


Spencerleehorton

Re: API 2503 transformer
« Reply #32 on: December 15, 2020, 12:41:35 PM »
I just wound a couple of versions of the 2503 onto a bigger bobbin and lams I think they are ei75 and had 4 bobbins of 0.25mm which I then wound onto bobbin then twisted onto another bobbin then put back on, 250 turns and hit 11ohms per wind with 130mh , they sound pretty good! ;)
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Aleguitarpro

Re: API 2503 transformer
« Reply #33 on: December 24, 2020, 09:00:43 AM »
I just wound a couple of versions of the 2503 onto a bigger bobbin and lams I think they are ei75 and had 4 bobbins of 0.25mm which I then wound onto bobbin then twisted onto another bobbin then put back on, 250 turns and hit 11ohms per wind with 130mh , they sound pretty good! ;)

I built mine using Litz wire.
I tried to use 4 wires twisting them but it's a lot of work and twists are not regular.
I haven't understand your procedure to wound bobbins and them twist.
I wound 4 different bobbins (about 340 turns to be sure to have about 280 turns available), then use the 4 different single bobbins/wires to twist into another bobbin.
Then I used the twisted 4 wires to wound bobbin of 2503 clone.
If someone has a easier approach would be great.
I haven't wound a 2503 with 4 single wires as suggested in blueprint.
The one with Litz are linear and sounds great

abbey road d enfer

Re: API 2503 transformer
« Reply #34 on: December 25, 2020, 05:10:19 AM »
I tried to use 4 wires twisting them but it's a lot of work and twists are not regular.
Twists don't need to be consistent, only so to make winding easier (no knots).
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.

iprovlek

Re: API 2503 transformer
« Reply #35 on: December 25, 2020, 07:14:31 AM »
Sorry on my delay reply Aleguitarpro...

Twists don't need to be consistent, only so to make winding easier (no knots).

It is exactly what Abbeyroad said.....
« Last Edit: January 12, 2021, 02:56:02 AM by iprovlek »

CJ

Re: API 2503 transformer
« Reply #36 on: January 11, 2021, 02:07:30 PM »
you can also use the 2503 for a Quad 8 output!


here is the 2503 print
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

CJ

Re: API 2503 transformer
« Reply #37 on: January 11, 2021, 02:08:49 PM »
API cut sheet
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

CJ

Re: API 2503 transformer
« Reply #38 on: January 11, 2021, 02:13:46 PM »
and one more
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

Spencerleehorton

Re: API 2503 transformer
« Reply #39 on: January 15, 2021, 07:48:01 AM »
im gonna order me some EI-63 and bobins and wind all API preamps, makes such a difference from what i was using, will also wind the rest of the input txf.
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!


 

Related Topics

  Subject / Started by Replies Last post
3 Replies
1990 Views
Last post October 08, 2008, 08:00:31 AM
by raysolinski
28 Replies
5910 Views
Last post March 27, 2013, 01:32:25 AM
by abbey road d enfer
18 Replies
2127 Views
Last post September 28, 2018, 12:14:47 PM
by Moby
0 Replies
708 Views
Last post June 17, 2019, 09:25:35 AM
by gyraf