The aim was to improve the audio playback quality of my existing hi-fi. The objective was to upgrade my budget DAC.
But believe it or not, I achieved my goal in the end by getting myself a budget friendly "Made In China" tube pre-amp instead, the Fosi Audio Tube-P1. The cost: about ⅛ of the price of a mid-range DAC.
With this pre-amp, my hi-fi audio experience is much better now. I can hear a lot of improvement. More rumbling bass, more thumping drums, better sound-stage and much better clarity. And mind you, I am just using the stock vacuum tubes that was included in the box, the China made 6K4. I don't think I will be upgrading to the GE5654 tubes. My ears are telling me that these 6K4 tubes are good enough. They are quite economical too.
Now, I have never owned nor have I experienced listening to mid-range or high-end DACs before. I'm sure these products can give much better sounding audio playback. But I do not have deep pockets. So, this Fosi Audio pre-amp addition will just have to do for now. For me at least.