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In Reply to: RE: Want to add Interstage transformer equivalent to the one used on Dac kit 2.1 posted by BTE on February 18, 2009 at 10:23:11
Here is a cheap option to experiment with, EDCOR 600 ohm matching transformers
http://www.edcorusa.com/products/transformers/wsm/wsm600-600.html
I started with these $10 transformers, and the improvement was noticeable,
not earth shattering, but a little more refined. The transformers are not shielded so placement is a consideration. Hook up is easy.
I have a spare pair if you want them, send me an email with your mailing address and I will send them to you with hook up instructions.
Tom R
You installed these in what? The 2.1-B kit already has the I/V transformers between the DAC and the output stage. Did you mod the A version? Or did you apply this to a DAC 1.1x/II Sig? Or something different?
"Live free or die"
Hi Tom. I have decided on a different approach. I will bypass the opamp as I am sure the kit does. The DAC will see ONLY the primary of transformer (1:1.5) and the secondary will be connected to tube grid with a 500 Ohm resistor (roughly 20 Ohms*1.5^2) to ground. I will use a pair of Sowter 9545s, if they fit. They appear to be huge.
"Live free or die"
Sound like you have found what you are looking for. Sorry for the mis information. I have a DAC 1.2, which is much different than the newer 2.1 versions. Thought I could offer some help. Good luke with you project.
Tom R
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