Call John Tucker directly at 425-334-4733. That's what I did. His customer service is outstanding.
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I noticed that you are a new member so you may not have realized that this thread is almost nine years old. ;)
Maybe I can address your question somewhat:
I have a stock 5400es and a ModWright 5400es with all the bells and whistles. The stock 5400es is a fine sounding SACD/CD player. The ModWright is in a completely different league, as well it should be for the additional cost. The ModWright is very un-digital sounding, more dynamically accurate, with a much larger and more real-to-life soundstage, and imparts just the right amount of tube magic to my otherwise solid-state system.
Hope this helps,
I had the Exemplar 3910 and 5910 - both outstanding DAC/Multi-Players.
The 5910 is a beast! Very well made.
John does amazing work with choke power supplies.
The 3910 and 5910 both take the 5965 , 6829, 7062, E180CC, or CV8431 family - John loves this family of tubes and rightly so.
I still have a large collection of 5965's, 6892's, 7062's - PM me and maybe you can have them all at a great price. Then roll to your hearts content.