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In Reply to: RE: 38H OPT for 845, so so? posted by firstname.lastname@example.org on April 10, 2021 at 11:32:10
If you aren't interested on bi-directional question is not a problem for me, of course.
The fact that you don't answer is clear for me.
Then, your opinion on large signal is opinable and not correct under the technical aspect; what do you want forma an OT trafo? to get 1 mV?
Then , regarding your test, please let me know the brand of your trafo and I will buy it for test; I have a good number of trafo tested left in a corner. I have also company that make for me the stuff on request ( the ones in the photo)
Last, of course the AP will test at the best the stuff and it is reference test set; surely your test set is not at the same level.
With Arta and sound card, as wrote more tha one time, you can understand lot of things.
Actually, this rejected transformer causes problems in a tube circuit.
And the real answer is no, we couldn't find the problem if we used an AP or ARTA because of their bandwidth limitations. Fine equipment in itself but good at other things.
But for that problem we could have used a scope and some other skills. Just out of curiosity I made a frequency curve.
This is a SE transformer 3500 Ohm tested with a EL34 in triode mode. Kathode bias and the low frequencie is a bit limited by the electrolitic capacitor.
Would be nice to have a 10dB NF and see what happens, 3Hz -300kHz must be possible for SE. With a 300B even slighty better.
Please decribe the test set up.
will buy this trafo for my test, please send details.
PS= it is funny, you show a diagram of one trafo seems to be fine but, then after my request to buy it, you wrote that this one got problem in a circuit.
It is a joke?
I repeat I am ready to buy your OT, to verify with a certified test set.
That was just a example of a transformer ( pp 5k) and what could be wrong and what happens if the test equipment has limitations. That perticular transformer i don't have anymore, it went in the trash bin.
The latest picture i posted of the 3500 Ohm SE i can make but not for sale, as we all know, i don't sell here anything. So don't send pm.
My test equipment is good enough, the "certified" (what ever that means) test set would not make any differance.
Ok, I understand.
At the end of the story you can't give any addtional specs or photo on the stuff you mentioned.
It seems a virtual world.
If I have the OT like you description I will be in hurry to sell them!!!!!
In attach the photo of two OT for SE, on the left is the one custome made from F.I.A.T. Roma for me, it is double C, 0,01mm, with a classical bell, for 300B s.e. Involved in a circuit the performance are good and the sound very fine.
The other is the one I spoke before, comes from Onori always in Italy, amourphos, 0,023 mm.
As you see I show the stuff I am speaking, this make a great difference.
Last, the AUdioreview magazine is insithe EISA so the test set is compliant with worlwide dierection.
Ohh, you like pictures of my projects?
The differance between you and me is that I actually design transformers.
It is possible to buy or not?
not allowed here Walter
If not here
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