Teddy Pardo are made and sold direct out of Israel so I doubt with shipping they would do a return but the sBooster may be one from Upscale Audio that does. Can’t speak for the others but I’m sure they are close in performance. I chose the Teddy based on positive comments from actual users and I prefer the appearance of it over the sBooster. I’m considering a Teddy for both my ProJect Xtension 10 table and Parks Audio Budgie phono preamp. Probably start with the Budgie as I really question on a turntable motor it will make a difference but ProJect recently came out with a linear supply as an upgrade for my table so who knows?
Before I upgraded to the Teddy I was using a custom power cord I made to go to the switch supply from the wall and that made an improvement, which convinced me if a power cord on the stock switch supply can make an improvement then surely a different supply would do as well and it did. I would suggest trying a power cord first to see if you hear a difference. The cord I made is the same one I also built for my Bluesound Vault 2 which also made an improvement with its internal switched PS. There’s been many discussions on the Bluesound players on upgrading the C7 type power cord so you can find several recommendations by others there under Bluesound Node and Vault players. Another nice thing about adding a linear supply is most have the more typical IEC inlet for more common cords.
Before I upgraded to the Teddy I was using a custom power cord I made to go to the switch supply from the wall and that made an improvement, which convinced me if a power cord on the stock switch supply can make an improvement then surely a different supply would do as well and it did. I would suggest trying a power cord first to see if you hear a difference. The cord I made is the same one I also built for my Bluesound Vault 2 which also made an improvement with its internal switched PS. There’s been many discussions on the Bluesound players on upgrading the C7 type power cord so you can find several recommendations by others there under Bluesound Node and Vault players. Another nice thing about adding a linear supply is most have the more typical IEC inlet for more common cords.