peranders said:Steve, you are the right person to answer.... why don't you mention that you are selling audio transformers? Maybe something for bee696?
There are a few reasons for that actually.
First, the InterFace is currently out of production.
Second, if he's capable of building his own gainclone, he's capable of buying the raw transformers and implementing them directly which would be preferable (and significantly less expensive) to using something like the InterFace.
Third, I'm not a saleshack and don't take advantage of forums such as this to try and sell my commercial products (not saying you're saying that I am, just saying that I'm not).
se
Thanks so much!!!
Actually, I got the non-inverted GC kit, and I'm thinking what kind of input transformer is suitable?
My worry is the input resistor of the kit is 20K, so can I simply add the input transformer and connect it to 20k directly? as some of transformers are stated that impedance ratio is 10k:10k. Is it OK?
The reason why I want to add an input transformer is I found that input transformer is recommended in AA tube forum (Jensen is the best, as I know).
I have no idea on "CineMag", somethings in my mind in Lundahl LL1540 http://www.lundahl.se/pdfs/datash/1540.pdf, or Jensen
JT-11P-1 http://www.comtran.com/datashts/11p1.pdf. Pls help!! THANKS!!
Actually, I got the non-inverted GC kit, and I'm thinking what kind of input transformer is suitable?
My worry is the input resistor of the kit is 20K, so can I simply add the input transformer and connect it to 20k directly? as some of transformers are stated that impedance ratio is 10k:10k. Is it OK?
The reason why I want to add an input transformer is I found that input transformer is recommended in AA tube forum (Jensen is the best, as I know).
I have no idea on "CineMag", somethings in my mind in Lundahl LL1540 http://www.lundahl.se/pdfs/datash/1540.pdf, or Jensen
JT-11P-1 http://www.comtran.com/datashts/11p1.pdf. Pls help!! THANKS!!
peranders said:
Not sure what you mean by "unless you have balanced output signals from the preamp."
Nice thing about a good input transformer is that you get just about the same common-mode noise rejection when fed from an unbalanced source as you get when fed from an unbalanced source, which is typically significantly higher than you'd get with typical electronically balanced inputs.
Also, since most high end and DIY audio equipment uses safety grounded chassis often with the signal reference ground tied to the safety ground, you can have a fair amount of interchassis leakage currents which can produce noise.
se
bee696 said:
The CMLI-15/15B is ideally loaded with a 15k resistor. The 20k resistor wouldn't be any significant problem. Though it would be a simple matter to simply replace the 20k resistor with a 15k if you have some readily available.
All three are good quality transformers.
I don't have any direct experience with the Lundahls, though the one thing I don't like about them is that they're all PC moint types which tends to make them a bit messier to deal with.
I'd used Jensen transformers for years and used the 11P-1 in a commercial product of mine. But I found the CineMag transformers to be every bit as good as the Jensens but the CineMags cost significantly less.
se
Appart from issues of noise rejection, do these transformers add any sort of sonic signature to the sound of an amp?
Put another way, if noise and ground loops were not an issue in my system, would the use of an input transformer add any sort of sonic fingerprint that might be deemed either desirable or undesirable?
Thanks,
KT
Put another way, if noise and ground loops were not an issue in my system, would the use of an input transformer add any sort of sonic fingerprint that might be deemed either desirable or undesirable?
Thanks,
KT
KT said:
Well, let me put it this way. Disregarding noise and ground loops, of the various components I've used input transformers on over the years, I've found that the results I get with the transformer sound better to me than without. So to that end I've been using input transformers as a consistent design element ever since.
Take it for what it's worth.
se
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