Could someone help me pick a portable amplifier. I will be using it with the ipod classic 6th gen and the sennheiser hd 238 headphones (modded). It would be helpful if I could buy it from ebay or amazon. Budget 25 - 50 euro.   Thank you.

I've read the Sennheiser HD238: Brief Review and Modding   and decided to mod my Sennheiser HD 238 also. I'm not afraid to do the modding myself,  the only problem is that I don't know what are  the materials  mentioned in the review above or where to find them : Soft Felt (Blue), Medium...

I've bought the Sennheiser HD238 and didn't like how they sound . I wanted to "Mod"  them and this is where your  "Sennheiser HD238: Brief Review and Modding" came into help. I'm not afraid to do the modding the only problem is that I don't know what are  the materials you mentioned or where...