Edcor mic input transformers

[Michael A]

Has anybody tried them?
http://www.edcorusa.com/products/transformers/mx/index_mxcs.html

 

[NewYorkDave]

Although it's possible to kludge some kind of external shielding can, an electrostatic shield between the primary and secondary is always a good thing on a mic input xfmr. The only shielding on these is an external copper tape shield. If they were a bit cheaper I'd buy a couple to try out--but I already have so many mic input xfmrs of various flavors that I can't justify 25 bucks to buy another one.

 

[audio2]

seems like it may be worth a try. prices are good.

 

[mikep]

[quote author="Michael A"]Has anybody tried them?
http://www.edcorusa.com/products/transformers/mx/index_mxcs.html[/quote]

Ive got one of their 1:5 mic inputs around here somehwere. I still havent built up a suitable test platform for it to know just how well it will work out in a real recording environment, but the initial listening tests, on the bench with padded down line-level signals, was encouraging.

mike p

 

[Gus]

super Q?

 

[Flatpicker]

They also have a fairly inexpensive ribbon mic transformer. Anyone tried that? It uses super q lams too.

 

[rotation]

Some time ago i checked Sescom Mi series and prices seem to be high for relativly unknown company in audio field.
Did you compare them to the Cinemag or other good company?

Miha

 

[fucanay]

Anyone ever try to use their rack chassis'? If they are good quality, they also have a pretty decent price.

Matt

 

[emrr]

I hate their rack cases and can't recommend them for anything other than light weight component usage. They are fairly thin metal and the panels don't mate in any sort of sturdy fashion. They assemble in a manner that makes it very easy to strip the threading, and thus don't appear to be built for multiple assembly cycles (as in, I need to modify or fix something). I built two projects using them, and swore never again. I had the feeling they might fall apart before I finished, and I had the hunch there were more ground plane continuity issues than other types. I've never spent so long tracking down and killing hum; may be unrelated, but didn't seem like it.

Your milage may vary. :evil:

 

[fucanay]

Thanks for the heads up. I'm always looking for a better deal on cases, but it doesn't seem like there is one.

Matt

 

[emrr]

[quote author="mediatechnology"]
emrr: Aren't many of their cases based on extruded aluminum?[/quote]


Not sure what to call it. Aluminum I recall. fairly thin. There are four thin channel pieces that the aluminum panels slide into, and the rest is small L brackets and screws. You can see through the cracks at the corners for sure. Look here.

 

[edcorusa]

I am sorry to weigh in on this, but I know that many have asked the question on why EDCOR does not use a static shield. If any one is interested I have writen a response to that question on the EDCOR's tech support site with a plot of the frequency response and THD+N.

http://www.audiotransformers.net/forum/index.php?topic=108.msg111#msg111

 

[jdbakker]

[quote author="edcorusa"]If any one is interested I have written a response to that question on the EDCOR's tech support site with a plot of the frequency response and THD+N.

http://www.audiotransformers.net/forum/index.php?topic=108.msg111#msg111[/quote]
The plot (like many other attached images) is only visible when you're logged in. That's a feature of SMF and other forum software, IMO a particularly unfortunate one.

JDB.

 

[edcorusa]

I have had the settingw change so that anyone may view the attachment, loggin or not. You can try it again. :thumb:

 

[Michael A]

Brian,

Thanks for the link to the Edcor forum. I hadn't noticed it when I was at the site.

Any idea on a good source of small mu metal cans that these transformers could be mounted into or potted into?

Thanks,
Michael

 

[CJ]

jensen sells cans
$$$

or diy with "copper foil/steel from the junk drawer" cans, 3 steel, 2 copper

 

[NewYorkDave]

Mu metal cans cost big bucks.

As CJ says, you can provide very decent shielding by using nested layers of copper and steel. It's cumbersome but it works.

 

[mikep]

[quote author="mediatechnology"]
What common-mode filter network would you recommend? [/quote]

I too would love to hear EDCOR's opinion on a good input filter.

mikep

 

[CJ]

don't forget to shield vector B

 

[12afael]

MetGlas is a cobalt based alloy which is only 0.00065" thick (that's 16 microns, a red blood cell is 8 microns across)!

:shock: :shock: :shock: :shock:

thanks for the Link, I `ve not seen nothing like that.
Rafael