Let's See Your Transformers!

nicoch · « **Reply #140 on:** 8 Jan 2016, 09:36 am »

I have eml300Bxl with big amorphous no problem here ! nice MG F spider too
but for beginner cheapers 300b/iron can a good start!!

E55l2 · « **Reply #141 on:** 8 Jan 2016, 12:22 pm »

E55l2 · « **Reply #142 on:** 12 Jan 2016, 11:28 am »

FullRangeMan · « **Reply #143 on:** 12 Jan 2016, 11:42 am »

Wow very instrutive post, being a non tech person I never could suspect it.
Thanks

Steve · « **Reply #144 on:** 12 Jan 2016, 06:15 pm »

Quote from: E55l2 on 12 Jan 2016, 11:28 am

This picture shows a Tribute transformer which has stacked cores, not the best design concern copper losses and parasitic magnetic and capacity losses.
That's why this transformer has a very bad high frequency response (-3dB 35kHz)

http://diytriode.republika.pl/drugi_eng.htm

I agree E55, not a good transformer response. One has to also consider the lack of interleaving and sectionalizing of the windings to minimize capacitance and leakage inductance. In the link I see the author is using 7k primary impedance (Z). The higher the primary impedance (higher ratio pri to sec windings) the lower the high frequency response is. I have seen OPTs with much much higher FR than that one.

-3db at 35khz will be tenths down even at 8.5khz, thus perceptible.

Cheers
Steve

E55l2 · « **Reply #145 on:** 12 Jan 2016, 08:10 pm »

Steve · « **Reply #146 on:** 13 Jan 2016, 05:05 am »

Quote from: E55l2 on 12 Jan 2016, 08:10 pm

Yes, you are right Steve but i am afraid that this transformer is as with most transformers from Tribute an easy design (just interleaving, maybe 10-12 layers) I was many times at Tribute and never saw any sofisticated design there, just a lot of iron and nicely potted. I think that not many people are interested in good designs.

That is an interesting post; I won't comment on the manufacturer at all.

I will say that the diy community tends to control what is manufactured and sold to the general public. Sometimes large manufacturers will have parts custom manufactured for them, and extra is available to the public. But I think that is somewhat rare (depends upon the def of rare?).

Have you found any more besides three or four OPTs that are good?? (I am assuming that if a proper circuit were used in the test, the low frequency response is good.)

Cheers
Steve

E55l2 · « **Reply #147 on:** 13 Jan 2016, 03:49 pm »

Unison845 · « **Reply #148 on:** 10 Mar 2016, 02:37 pm »

Tango transformers are back in production! these are first production Tango X10S and NC20 for my WE 212 amplifier being built. Very nice case, the X10S case now matched with NC20.

FullRangeMan · « **Reply #149 on:** 10 Mar 2016, 03:13 pm »

Good news and congrats.

nicoch · « **Reply #150 on:** 10 Mar 2016, 04:25 pm »

http://tango-trans.com/en/output-transformer/single-output/

squirrelman · « **Reply #151 on:** 11 Mar 2016, 03:56 am »

Wow when did tango announce they are producing transformers again?

Unison845 · « **Reply #152 on:** 15 Mar 2016, 01:41 am »

WAVAC bought Tango over a year ago, they start producing Tango line. These are first two products Tango X10S and NC20.

FullRangeMan · « **Reply #153 on:** 15 Mar 2016, 02:09 pm »

Well those huge Wavac prices served to something useful so.

squirrelman · « **Reply #154 on:** 15 Mar 2016, 10:42 pm »

Quote from: Unison845 on 15 Mar 2016, 01:41 am

WAVAC bought Tango over a year ago, they start producing Tango line. These are first two products Tango X10S and NC20.

Dare I even ask what they are going for now?

Unison845 · « **Reply #155 on:** 16 Apr 2016, 02:53 pm »

It is about 480K Yen+ shipping from Japan.

mresseguie · « **Reply #156 on:** 16 Apr 2016, 03:09 pm »

I have a question for anyone who cares to answer.

How can one determine any given transformer's quality just by looking at its specs? Is this possible, or must it be tested as well?

I ask because I was given a tour of a factory in Taiwan last year. This factory has been producing transformers for something like 40 years.

Thank you.

Michael

FullRangeMan · « **Reply #157 on:** 16 Apr 2016, 05:23 pm »

E55L2 would answer your question in detail, but I think basically its a extended freq range in bass and treble, good power handling, low noise etc
Please note the quality of the parts used in construction make a major difference, the best parts are .03mm or thinner HiB or Finemet C cores, secondary in silver.

A great transformer builder cant do miracle w/SiFe EI .03mm.

FullRangeMan · « **Reply #158 on:** 16 Apr 2016, 10:16 pm »

A OPT winding badly done looks like this:

E55l2 · « **Reply #159 on:** 12 May 2016, 09:13 pm »