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Output transformer ???'s

post #1 of 2
Thread Starter 

Started down the mod-path the other week and am scoping output transformer mods to my various OTL amps.

 

The Hammond 119DA thus far is one I am considering, being that its used in the mapletree MAD Ear amps.

 

This EI-14 caught my eye though, because it looks like its specifically made for headphone amp circuits.  Does anyone have experience with this one?  At this price point, what are its drawbacks?  I am guessing badwidth might be one.

 

http://www.ebay.com/itm/EI-14-Audio-Output-Transformer-3-8K-32-ohm-FSe-/160981696054?_trksid=p2047675.m1850&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D14323%26meid%3D5870309211587863793%26pid%3D100011%26prg%3D1095%26rk%3D1%26sd%3D150986665290%26

 

post #2 of 2

When the seller does not specify something, it is usually safe to assume that this spec is not very good. 

 

Radioshack makes a 1K:8 transformer that is pretty tiny, and measures OK. 

It is also less than 1/2 the price of the ones you linked, which is always attractive for diy-experimentation or building little baby-sized guitar amps. 

 

http://www.head-fi.org/t/553094/continued-sidetrack-discussion-from-tiniest-portable-amp-i-can-build-nikongod-microtransformer-based-impedance-step-down-box

 

Makes a good portable amp for IEM's too :) 

 

Prem magnetics makes a few transformers at similar prices, that were suggested to me a long while back. 

Mouser also sells a line of ittsy bitsy transformers like the radio-shack ones. It's been a long time since I looked for them, so I cant remember the brand.


Edited by nikongod - 2/27/13 at 6:48am
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