Build a tube mic pre? input transformer

[savageblues]

Hi Folks, anyone here build their own tube mic pre? If so what iron have you used? The JT-115K-E from Jensen seems to be whats recommended, but has any other iron that's been tried?

If you're interested and can comment, take a look at this link at let me know if maybe the 850L or 850N might do it. These are $125 CDN each, and can be had locally. Specs do look pretty good 20hz - 20kHz +/- 0.5 dB (although it does say that units with impedence above 5k MAY be down 1db at 20khz. The spec also states 1.5% THD at 20Hz when the transformer is running at FULL rated current. Thats not too bad at that low freq...



Hammond broadcast quality audio transformers 850L

 

[Scooter B]

You might check out this site

www.nanimo.ark.com

AKA Pats Tube Site he seems very knowledgable.

There was a long thread about six months back here entitled "building our own mic pre" . I tried to get a direct link for you to click using the search function but it would not pull anything up for me but I know its there.

 

[h kuhn]

I found some very useful answers on this sites:
http://www.forsselltech.com/
(send him an email, very friendly and knowledgable)
http://www.shinrock.com/Schaltungstechnik/schaltungstechni.html
(they have an english section, too)
http://www.rollmusic.com/projects/3125.shtml
no toobe, but he has helped me quiete a bit, too.

I can only guess if any of the above will get you any further, as i am into transformerless solidstate designs.
What i have read is that people sometimes use lundahl trannies instead of jensens (especially in europe).