I just returned my second defective Manley Chinook

My first Chinook(bought in 2012) was replaced because of numerous pops and hum.Returned replacement Chinook today because of occasional pop and hum from right channel. Manley is going to change out the main circuit board with the latest.This has been very disappointing and I will attempt to return or sell the Chinook after it is returned to me.How should I handle this with the on-line company that sold me the Chinook?This is not a knock against Manley or their product.
When I purchased the Manley I told the phone rep that I would be willing to spend more for a Herron phono but was told Herron worked best when used with other Herron gear.
From everything I have read on Audiogon this does not seem to be the case.
This was my first experience with tubes and it was disappointing so I was thinking about going back to a solid state phono possibly Pass Labs XP15.But I enjoyed the tube sound so still thinking about the Herron.
I am 64 years old and I want this to be the last phono amp I buy so I want to make sure I make the proper choice.Any advice would be greatly appreciated.
My system is VPI Classic One with Lyra Delos.Amp and pre-amp is Jeff Rowland.