HD 598 to TV Stereo-Out--Amp Needed?

[ralob]

Hi!
 
I have a pair of HD 598 that I use to listen to TV via stereo-out. I'd like to be able to increase the volume and was curious to see what type of amp you all would recommend. I've been doing a lot of reading and have heard that using portable amps such as Fiio A3 while plugged in/charging adds noise. My budget is about $120-$150; I'd prefer using something that I don't have to worry about dying if not charged.
 
Thanks for reading and for any help.

 

[PurpleAngel]

If your TV has an optical output.
Check out this $90 DAC and headphone amplifier, from Hifimediy
http://hifimediy.com/DACs/ready-made-dacs/spdif-dac-110V?sort=p.price&order=ASC&limit=100

 

[ralob]

My TV does indeed have an optical output. Thanks for the link--I will keep an eye on them. They seem to be exactly what I need.
 
I appreciate the rec!