music hall 25.2 DAC mod

I recently got this DAC too. I have a NOS 60's French Mazda (Philips-owned) 7308 tube en route from Brent Jessee.

I'm also toying with opamp swaps in the RCA tube circuit - replacing the stock (2) OPA2134 and (1) OPA2604.

Not wanting to spend the cash on Burson's at this point.

Does anyone have any opamp swap experiences/recos for this DAC. I've been considering AD8066, AD8620, or LM4562.

Thanks,

Adam

Nonoise - I got the Mazda 7308 yesterday. It's a Miniwatt/Dario label from 1967. Installed it yesterday afternoon and have been breaking it in since - haven't done any serious listening yet.

As a side note - did yours have the actual Gm numbers on the box label?

Nonoise - thanks. I was really just wanting to know if you had the actual Gm data or the check marks (because I thought it was strange that mine had the check marks on the label and no actual data). Looks like you got the check marks too, which tells me that it must be a fairly standard/common way for him to do the labels.

This was my first tube purchase, so I'm new to tubes too.