Low Cost DACs


Currently I have my laptop connected directly via 1/8 jack from headphone outlet into 2 RCAs directly into my tube amp. Quality of sound is lacking to say the least!
I am considering adding an inexpensive DAC ( iFi AUDIO nano iDSD LE Portable DAC  or iFi Audio nano iOne DAC ) into the stream between the laptop & amp.My question is: will this influence the overall sound I'll hear out of my speakers? Will adding such a DAC help to increase the quality of sound produced by the system?
I'm not interested in spending a lot of money on a DAC as this is a source that I don't use as much as some others already in the system.
wcc10
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ghulamr, Thanks for the post. Yes, sometime we complicate things more than necessary. Not sure why I hadn't thought of that!??! Guess I wanted to play with something new!As for cables; yes I've ordered a Tos Link cable to attach Schiit to back of OPPO. (Redundant?) Unfortunately I had sold my only Tos Link some time ago. I'm sure it will not enhance the quality of sound but then I'm experimenting, I guess. After morning coffee I'm going to try what you suggested and I'll let you know. Thanks.
AudioQuest Dragonfly. Good for laptops, mobile phone/tablets (ie, streaming Tidal on the go) or small systems. The new Cobalt gets a great review in the current issue of AbSound. Cobalt decodes MQA too. 
https://www.theabsolutesound.com/articles/audioquest-dragonfly-black-and-dragonfly-red-dacs/