Cheapest input Transformer for API 312 type

[Di_Sousa]

Hi,

I'm looking for the cheapest alternative solution for input transformer on an API 312 type preamp, something that worth 5-10 Dollars or less would be great.

Any ideas?

Thanks

W

 

[mjrippe]

That would be the 2622, right?  Listed as 150/600 primary, 10k secondary.  Edcor COM14 fits that description for $5.01.  http://www.edcorusa.com/p/868/com14

 

[Di_Sousa]

That would be the 2622, right?  Listed as 150/600 primary, 10k secondary.  Edcor COM14 fits that description for $5.01.  http://www.edcorusa.com/p/868/com14

I supose so. Thank you so much

Have to see if I can get Edcor in Europe.

Any place or brands in Europe for cheap Audio Transformers?

Thanks

 

[wolan42]

I have use two small Beyer 1:10 and they sound good. You can also try 1:7
You find them sometimes on german eBay.
For 2 of them I have paid 20,00 Euro. Sometimes more, sometimes less.


Andreas

 

[Di_Sousa]

I have use two small Beyer 1:10 and they sound good. You can also try 1:7
You find them sometimes on german eBay.
For 2 of them I have paid 20,00 Euro. Sometimes more, sometimes less.


Andreas

Thanks Andreas, the API 312 want to have a 1:7 or 1:10 at the input?

Thanks

 

[CJ]

orig. 2622 is

1:3.5  Series Primaries
1:7    Parallel Primaries

24-25 EE nickel lams

 

[gridcurrent]

orig. 2622 is

1:3.5  Series Primaries
1:7    Parallel Primaries

placed an original, real 2622 on the bench.
0.1 VAC @ 1000 Hz into the high Z side.
.0122 VAC on the low Z windings, strapped in parallel.

Same test @ 10 VAC in,
1.24 VAC out.

No appreciable loading in the test setup.
Suggests a 8:1 to me.

 

[3nity]

JLM kits uses a cheap input transformer you can find them on ebay for 5$
.

 

[CJ]

Gridcurrent, you are probably right, the one i took apart had a broken sec so i could not do a ratio test, also, it was cased in very hard black epoxy if i remember right, (been 10 years), so counting the #50 wire was no easy task so i probably counted short, came up with 1 : 7.12

can you check some things on that guy, like sec DCR?

and maybe put a 20 Hz into the sec and measure the current at about 1 volt AC?

thanks! i will put up a blueprint if i can get a few more parameters supplied,

cj

 

[CJ]

here is a doc i found at dan alexanders site,

this would seem to indicate a 150/10K = 1:8

or a  600/10K = 1:4,

maybe put a 10 K load resistor on that 2622 and see what the turns ratio is,